The Lab Library

Nutrient shortfalls

• HDL responds far more to metabolic state than to any single nutrient -- it falls with insulin resistance and rises with physical activity, and no supplement moves it reliably.
• Omega-3s raise HDL modestly; refined carbohydrate lowers it.

Exposures

• Smoking lowers HDL and impairs its function; trans fats lower it directly.
• PFAS exposure associates with altered lipids in the C8 cohort, including cholesterol -- one of the six conditions the C8 Panel named.

Gut

• Microbiome-driven changes in bile acid handling reach HDL through reverse cholesterol transport.

Detox capacity

• HDL carries cholesterol back to the liver for disposal in bile -- so its job is a clearance job, and hepatic function is part of whether it works.

How it cascades

• A LOW HDL WITH HIGH TRIGLYCERIDES IS THE INSULIN-RESISTANCE PATTERN, and it is more informative than either number read alone. That combination is the signal to look at fasting insulin, ALT and uric acid.
• Raising HDL pharmacologically has repeatedly failed to deliver the benefit its association predicted -- which is a caution about treating it as a target rather than a readout.

What people often feel when it runs high

• Silent, and NOT automatically good news. ⚠️ HDL IS ONE OF THE CLEAREST U-SHAPED MARKERS IN THE PANEL: very high HDL (roughly above 80-90 mg/dL) has been associated with WORSE outcomes in large cohorts, not better. The drugs that raised HDL failed to reduce events. HDL is a marker of the process, not a lever to pull.
• Heavy alcohol intake raises HDL, which is one reason a 'good' HDL is not self-explanatory.

What people often feel when it runs low

• Silent. HDL produces no sensation at any level.
• A low HDL travels with the metabolic pattern that does produce symptoms -- central weight, the afternoon crash, raised triglycerides, rising blood pressure.
• Smoking, physical inactivity and very low-fat high-refined-carbohydrate diets all lower it.

Patterns it travels in

• HDL LOW + TRIGLYCERIDES HIGH is the metabolic signature, and the TG:HDL RATIO is a better read on insulin resistance than either number alone.
• HDL LOW + APOB HIGH + WAIST UP + GLUCOSE UP -- the metabolic-syndrome cluster. Any three carry more meaning than one.
• ⚠️ DO NOT CHASE HDL AS A TARGET. Every pharmacological attempt to raise it failed to improve outcomes. Treat a low HDL as a signal to address triglycerides, insulin resistance and activity -- which raise it as a side effect of fixing something real.
• HDL HIGH + heavy alcohol intake -- ask, rather than congratulate.
• HDL LOW + TSH HIGH -- thyroid again, before diet.

Ingredients with evidence in our library

• Physical activity, and stopping smokingsolid -- The two interventions that actually move HDL, and neither is purchasable. Framed honestly: they move it because they change the underlying process, which is the only reason HDL moving is worth anything. (206 studies in our library, 37 in people)
• Extra virgin olive oil (oleic acid + polyphenols)emerging -- Our library holds olive oil polyphenols improving HDL cholesterol and supporting lipid metabolism maintenance -- one of the few dietary interventions with a direct HDL endpoint rather than a total-lipid one. (2 studies in our library, 1 in people)
• Beta-glucan (oat/barley)solid -- 5 rows, 4 human -- systematic review and meta-analysis in dyslipidaemia. (5 studies in our library, 4 in people)
• Astaxanthinemerging -- Supplementation measured on glycaemic control and lipid profile together in human trials. (2 studies in our library, 2 in people)
• Saffron, goji and pycnogenolemerging -- Each carries 2-3 human-typed rows on lipid profile in our library -- small, consistent, and not to be oversold as HDL-specific. (3 studies in our library, 3 in people)
• ⚠️ Niacin -- the cautionary talecontested -- Raises HDL substantially and failed to reduce cardiovascular events in two large outcome trials (AIM-HIGH, HPS2-THRIVE) while causing more harm. It is the clearest proof available that HDL is a marker and not a target, and it belongs on this page for that reason. (2 studies in our library, 1 in people)

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

Movement & practices with evidence in our library

• Aerobic / endurance (Zone-2)solid -- A systematic review of 84 studies in healthy adults found high-intensity aerobic exercise most consistently raised HDL cholesterol, while resistance and combined training showed inconsistent... (34 studies in our library, 18 in people)
• Resistance / strength trainingmixed -- For obese postmenopausal women, 16 weeks of aerobic training increased HDL cholesterol and reduced total and LDL cholesterol, while 12 weeks of resistance training improved HDL and reduced... (8 studies in our library, 6 in people)
• Yogamixed -- In 262 adults with high blood pressure, ten days of residential yoga and naturopathy lowered every lipid fraction measured, including HDL; the comparison group received nothing, so attention and... (5 studies in our library, 3 in people)
• Walking / post-meal walkemerging -- In 12 sedentary young adults, hourly 4-minute walking breaks after aerobic exercise reduced non-HDL cholesterol iAUC 36 mg/dL compared to uninterrupted sitting or other break durations. (5 studies in our library, 2 in people)

Counts are of studies in our citation library that name this marker and involve that practice. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

Diet patterns with evidence in our library

• Mediterranean dietmixed -- Mediterranean diet adherence was associated with 53-50% lower six-year metabolic syndrome risk, improved HDL-cholesterol, reduced waist circumference and triglycerides in prospective European cohort. (12 studies in our library, 5 in people)
• Low-carb / ketogenicmixed -- Network meta-analysis of 47 RCTs (n=3,450) found ketogenic diets increased LDL-C 0.43 mmol/L more than low-fat diets, while carbohydrate restriction improved triglycerides and HDL but had... (8 studies in our library, 6 in people)
• Plant-based / veganmixed -- vegan diet Multivariate linear regression analyses showed that vegan and ovo-lacto vegetarian diets decreased HDL-C levels in premenopausal women (β = -7. (8 studies in our library, 4 in people)
• Ultra-processed (adverse)emerging -- Ultra-processed food consumption in preschool children was associated with higher BMI, waist circumference, fat mass, glucose, and lower HDL. (6 studies in our library, 1 in people)
• High-fiber / whole-grainmixed -- In healthy habitual non-whole grain consumers, 6 weeks of whole grain products reduced total, LDL, and non-HDL cholesterol without changing microbiota diversity or glucose. (5 studies in our library, 4 in people)
• Diet quality / healthy patternemerging -- In 1,806 multiethnic participants, better diet quality significantly associated with higher carotenoids, adiponectin, and HDL-cholesterol; lower CRP, triglycerides, glucose, and HOMA-IR;... (4 studies in our library, 2 in people)

Counts are of studies in our citation library that name this marker and involve that diet pattern. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

Nutrient shortfalls

• Omega-3 shortfall, and a high omega-6 to omega-3 ratio, shift eicosanoid production toward the inflammatory side.
• Magnesium and vitamin D shortfall both associate with higher CRP in population data.
• Low antioxidant status raises oxidative stress, which feeds the same inflammatory signalling.

Exposures

• Heavy metals, air particulates and persistent organics all raise systemic inflammatory signalling -- CRP is where a diffuse exposure burden becomes a number.

Gut

• A compromised barrier lets endotoxin into circulation, and that is one of the best-characterised routes to a raised CRP with no obvious infection. When CRP is up and nothing hurts, the gut is worth looking at.

Detox capacity

• Inflammation and detoxification compete for the same resources -- glutathione especially -- so a sustained CRP raises the demand side of everything GGT reflects.

How it cascades

• Gut barrier loss -> endotoxin -> systemic inflammation -> CRP rises -> and the same inflammation raises hepcidin (iron locked away) and lowers albumin. One upstream cause, three markers moving.
• hs-CRP is nonspecific by design. Its value is as a yes/no on whether an inflammatory process is running -- it never says where.

What people often feel when it runs high

• Deep, unrefreshing fatigue -- searched as 'tired all the time blood tests normal' and 'why am i tired even after 8 hours sleep'. Inflammatory signalling is genuinely sedating; this is not deconditioning.
• Brain fog, slow word-finding, a sense of thinking through cotton wool.
• Aching that migrates and has no injury behind it -- stiffness that is worse in the morning and eases with movement.
• Low mood and anhedonia with no situational cause -- 'losing interest in everything but not depressed'. Inflammatory cytokines act directly on motivation circuitry.
• Poor recovery from ordinary exertion, and getting ill more easily than peers.
• ⚠️ A SINGLE HIGH READING USUALLY MEANS A COLD, NOT A CHRONIC STATE. Any infection, injury or hard training session in the preceding two weeks can push hs-CRP far above baseline. One value is close to uninterpretable -- repeat it when well before drawing any conclusion.

What people often feel when it runs low

• No symptoms. Low is the desirable direction.

Patterns it travels in

• HS-CRP HIGH + FERRITIN HIGH + IRON SATURATION LOW is the pattern most often misread in this whole panel. Ferritin is an acute-phase protein and rises with inflammation, so inflammation can make a genuinely iron-deficient person look iron-replete. Iron given on that misreading makes things worse. Always read ferritin against hs-CRP -- our own measurement shows iron tags appearing on 13 hs-CRP rows for exactly this reason.
• HS-CRP HIGH + ALBUMIN LOW is the same acute-phase response seen from both ends -- CRP is a positive acute-phase protein and albumin a negative one. Together they suggest a sustained process rather than a passing one.
• HS-CRP HIGH + VITAMIN D LOW is the commonest modifiable pair in the library on this marker (9 rows, 8 of them human), and it runs in both directions -- low vitamin D permits more inflammatory signalling, and inflammation lowers measured 25(OH)D.
• HS-CRP HIGH + HBA1C HIGH + TRIGLYCERIDES HIGH is metabolic inflammation, driven from adipose tissue and liver. The lever is metabolic, not anti-inflammatory supplementation.
• HS-CRP HIGH + NEUTROPHIL-TO-LYMPHOCYTE RATIO HIGH adds the immune shape of the response to its intensity.
• HS-CRP NORMAL DOES NOT MEAN NO INFLAMMATION. It is a liver-produced systemic signal; localised gut, joint or oral inflammation can be substantial with a normal hs-CRP.

Ingredients with evidence in our library

• Vitamin Dsolid -- The strongest and most human-weighted association on this marker in our library -- status tracks inversely with hs-CRP, and supplementation trials show reduced oxidative-stress and inflammatory parameters. Read causally with caution: inflammation itself lowers measured 25(OH)D. (9 studies in our library, 8 in people)
• Probiotics and synbioticssolid -- Lower circulating inflammatory biomarkers including hs-CRP -- the gut-barrier route the cross-reference spec predicts, and one of the few with human trial weight behind it here. (8 studies in our library, 7 in people)
• Saffron / crocinsolid -- Systematic review and meta-analysis on inflammation and oxidative stress specifically -- reduced inflammatory markers. Consistently one of the better-evidenced botanicals in this library. (5 studies in our library, 4 in people)
• Curcuminsolid -- Reduced oxidative-stress and inflammatory markers in human supplementation trials. (4 studies in our library, 4 in people)
• Zincsolid -- Meta-analysis of supplementation and immune factors in adults shows movement in inflammatory measures; zinc is also required for the antioxidant enzymes that restrain the response. (5 studies in our library, 4 in people)
• Vitamin Eemerging -- Improved biomarkers of intestinal inflammation alongside lipid changes -- again the gut-barrier route rather than a direct antioxidant effect on the marker. (5 studies in our library, 5 in people)
• Seleniumemerging -- Double-blind randomised trial evidence in an autoimmune population; selenium is the cofactor for glutathione peroxidase, which is upstream of the oxidative signalling that drives CRP. (3 studies in our library, 3 in people)
• Butyrate and the fibres that produce itemerging -- Oral synbiotics shifted gut microbiota and inflammatory biomarkers together. Butyrate is the fuel colonocytes use to maintain the barrier whose failure drives endotoxin-mediated inflammation. (3 studies in our library, 3 in people)
• Extra virgin olive oil (oleic acid + polyphenols)emerging -- Daily consumption moved biomarkers of inflammation and oxidation in human trials. (2 studies in our library, 2 in people)
• Boswellia serrataemerging -- Standardised extract attenuated exercise-induced inflammatory response over ten days -- a narrow, specific finding rather than a general anti-inflammatory claim. (2 studies in our library, 2 in people)

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

Movement & practices with evidence in our library

• Aerobic / endurance (Zone-2)solid -- In 60 overweight type 2 diabetes patients, 6 months of aerobic exercise (4x/week, 45-60 min) reduced hs-CRP and IL-18, increased IL-10, and improved glucose control and cardiovascular markers... (19 studies in our library, 10 in people)
• Yogasolid -- Pooling 34 trials (2,219 adults) of tai chi, qigong, meditation or yoga, only C-reactive protein fell (effect 0.58, CI barely above zero); IL-6, TNF-alpha, CD4 and NK counts showed no significant... (16 studies in our library, 12 in people)
• Social connection / belongingmixed -- In a survey of 3,446 US women, greater social isolation was linked to higher fibrinogen levels but not to C-reactive protein, and showed no association with cancer mortality once obesity and... (14 studies in our library, 6 in people)
• Sleep (duration / timing)solid -- In 264 newly diagnosed head and neck cancer patients, a network analysis found poor sleep quality, fatigue, CRP, and IL-6 were the most interconnected nodes linking psychological symptoms to... (14 studies in our library, 13 in people)
• Resistance / strength trainingmixed -- Systematic review of 10 trials found a single bout of moderate to high-intensity aerobic or resistance exercise increased IL-6 by 145% and neutrophil counts by 51% in untrained adults, with... (13 studies in our library, 9 in people)
• Meditation / mindfulnessmixed -- Reviewing 20 randomized trials with over 1,600 participants, mindfulness meditation was tentatively linked to reduced markers of inflammation (such as CRP and NF-kB activity) and increased... (7 studies in our library, 6 in people)
• Spiritual / religious practiceemerging -- In 6,652 US adults aged 50 and older, more frequent religious attendance and higher religiosity or spirituality were linked to lower average C-reactive protein, a marker of inflammation, after... (6 studies in our library, 2 in people)
• Purpose / meaning in lifeemerging -- In a meta-analysis of over 54,000 adults across seven cohorts, greater purpose in life was modestly but consistently associated with lower c-reactive protein, a blood marker of inflammation, both... (3 studies in our library, 2 in people)

Counts are of studies in our citation library that name this marker and involve that practice. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

Diet patterns with evidence in our library

• Mediterranean dietmixed -- Green Mediterranean diet enriched with walnuts, green tea, and Mankai showed greater reductions in LDL cholesterol, diastolic blood pressure, insulin resistance and C-reactive protein versus... (13 studies in our library, 7 in people)
• High-fiber / whole-grainmixed -- Among 8,372 U.S. adults with leisure-time physical activity, increased dietary fiber intake was associated with significantly lower C-reactive protein; association did not persist after waist... (13 studies in our library, 4 in people)
• Diet quality / healthy patternmixed -- In 14,623 U.S. Hispanics and Latinos, each 10-unit increase in Alternate Healthy Eating Index was associated with 21 percent lower odds of elevated C-reactive protein and 37 percent lower odds of... (13 studies in our library, 8 in people)
• Plant-based / veganemerging -- Randomized, single-blind controlled trial (27 vs. 26 patients): fasting then gluten-free vegan/lacto-vegetarian diet significantly improved joint counts, pain, ESR, CRP, and HAQ score vs. control,... (3 studies in our library, 2 in people)
• Low-carb / ketogenicemerging -- A single-patient, ten-year case study of a South Asian man on a culturally adapted low-carbohydrate diet found sustained normal blood sugar without medication and consistently low C-reactive... (3 studies in our library, 1 in people)
• DASH dietemerging -- A meta-analysis of 25 randomized trials found the DASH diet reduced systemic inflammation markers C-reactive protein and interleukin-6 compared with control diets across the pooled participants. (2 studies in our library, 2 in people)

Counts are of studies in our citation library that name this marker and involve that diet pattern. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

Nutrient shortfalls

• Choline shortfall raises triglycerides by the liver route -- without choline the liver cannot export fat as VLDL, so fat accumulates there instead. This is the cleanest link between a lipid panel and liver status.
• Omega-3 shortfall raises triglycerides; above roughly 3 g/day of combined EPA and DHA they fall 15 to 30%, while lower doses do little.
• Magnesium is a cofactor for lipoprotein lipase, the enzyme that clears triglycerides from the blood.

Exposures

• Fructose and alcohol are the two most reliable dietary drivers of triglycerides, and both work through the same place -- de novo lipogenesis in the liver.
• Trans fats lower HDL and raise LDL simultaneously, which almost nothing else does.

Gut

• The microbiome shapes bile acid signalling and short-chain fatty acid production, both of which influence hepatic lipid handling.
• Soluble fiber binds bile acids so they are excreted rather than recycled, forcing the liver to use cholesterol to make more -- the mechanism behind fiber's effect on LDL.

Detox capacity

• The liver builds and clears these particles, which is why lipids and liver enzymes move together far more often than either panel suggests on its own.

How it cascades

• TRIGLYCERIDES ARE A LIVER MARKER AS MUCH AS A LIPID ONE. Excess fructose or alcohol -> de novo lipogenesis -> hepatic fat -> triglycerides rise AND ALT rises AND uric acid rises. Three panels, one process. If triglycerides are up, read ALT and GGT beside them.
• The TRIGLYCERIDE-TO-HDL RATIO is the most useful number on this panel and is not printed on it -- it tracks insulin resistance more closely than either value alone, and it moves years before fasting glucose does.
• High triglycerides also shift LDL toward the smaller, denser particles that ApoB counts -- which is why a normal LDL-C with high triglycerides can still mean a raised particle number.

What people often feel when it runs high

• HIGH TRIGLYCERIDES: silent at ordinary levels. Very high levels (roughly above 500 mg/dL) can cause abdominal pain and pancreatitis, and at extreme levels the blood plasma looks visibly milky.
• The symptoms that actually travel with raised triglycerides belong to the metabolic pattern behind them -- the post-meal crash, central weight, rising blood pressure, fatty liver.
• Small yellowish deposits on the eyelids or in skin creases point at markedly abnormal lipids and are worth noticing.
• ⚠️ TRIGLYCERIDES ARE THE MOST DIET-RESPONSIVE MARKER ON THE WHOLE PANEL and the most sensitive to what happened in the last few days -- a fasting sample matters here more than for anything else.

What people often feel when it runs low

• Very low total cholesterol alongside low albumin and unintended weight loss points at absorption or liver capacity, not at good health.

Patterns it travels in

• TRIGLYCERIDES HIGH + HDL LOW is the metabolic signature, and the TG:HDL RATIO is one of the best cheap proxies for insulin resistance available on a standard panel. It needs no extra test and is almost never calculated.
• TRIGLYCERIDES HIGH + ALT HIGH -- two readouts of one process. Triglycerides frequently move FIRST, which makes them an earlier warning than the liver enzyme. Our library holds 66 rows pairing triglycerides with liver fat and 25 on fructose restriction, 12 of them human.
• TRIGLYCERIDES HIGH + APOB HIGH + LDL-C NORMAL is the small-dense pattern -- many small cholesterol-poor particles. LDL-C alone reads normal and misses it entirely.
• TRIGLYCERIDES HIGH + FASTING INSULIN HIGH + URIC ACID HIGH is the fructose picture: fructose is the one common sugar whose metabolism generates urate directly and drives hepatic lipogenesis.
• TOTAL CHOLESTEROL HIGH + TSH HIGH -- rule out the thyroid before treating it as diet. Hypothyroidism slows LDL-receptor clearance and correcting it corrects the lipids.
• ⚠️ A RECENT VERY LOW-CARB DIET, A COLD, PREGNANCY, OR ALCOHOL IN THE LAST 48 HOURS all move these numbers. Ask before interpreting.

Ingredients with evidence in our library

• Omega-3 (EPA/DHA)solid -- 44 rows, 34 human -- the most reliable and most dose-dependent triglyceride-lowering intervention in this library. This is the endpoint on which fish oil's evidence is strongest by a distance, more so than for anything else claimed for it. (44 studies in our library, 34 in people)
• Cutting fructose and alcoholsolid -- The two largest levers, and both are subtractions. Our library's fructose-restriction rows measured liver fat and de novo lipogenesis falling together (12 human-typed). Alcohol raises triglycerides directly and quickly. (25 studies in our library, 12 in people)
• Beta-glucan (oat/barley)solid -- 11 rows, 7 human -- meta-analytic evidence in dyslipidaemia. Viscous fibre binds bile acids so the liver must clear more particles to rebuild them. (11 studies in our library, 7 in people)
• Saffronsolid -- 10 rows, 8 human -- glycolipid metabolism and blood pressure in metabolic syndrome. Unusually high human proportion for a botanical. (10 studies in our library, 8 in people)
• Probiotics and synbioticsemerging -- 15 rows, 6 human, plus 7 prebiotic rows -- anthropometric and lipid outcomes measured together. (22 studies in our library, 8 in people)
• Anthocyanins (purple corn, black rice, berries)emerging -- 17 rows across both anthocyanin tags, reviewed with curcumin and resveratrol for metabolic dysfunction. (9 studies in our library, 5 in people)
• Artichoke leaf extractemerging -- 13 rows -- systematic review evidence in fatty liver, where the lipid and liver endpoints move together. (13 studies in our library, 2 in people)
• Beta-sitosterol / plant sterolssolid -- 6 rows. Competes with cholesterol for intestinal absorption; roughly 5-15% LDL-C reduction at about 2 g/day. (6 studies in our library, 3 in people)

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

Movement & practices with evidence in our library

• Aerobic / endurance (Zone-2)solid -- A systematic review, this systematic review and meta-analysis showed that HIIT induces favorable adaptions in cardiorespiratory fitness, physical fitness, muscle power, cardiac contractile... (48 studies in our library, 24 in people)
• Resistance / strength trainingsolid -- A meta-analysis of 16 trials totaling 2,426 middle-aged and older adults with type 2 diabetes found combined aerobic and resistance exercise was associated with better cognition, HbA1c, lipid... (17 studies in our library, 13 in people)
• Yogasolid -- Meta-analysis of 53 yoga trials (13191 participants) found yoga reduced total cholesterol 10.31 mg/dl, LDL 8.64 mg/dl, triglycerides 13.50 mg/dl, increased HDL 1.98 mg/dl. (16 studies in our library, 10 in people)
• Walking / post-meal walksolid -- In 26 older adults with cardiovascular risk phenotype, Mediterranean diet meal produced lower postprandial triglycerides than Western high-fat meal, but neither diet-plus-walking improved... (12 studies in our library, 10 in people)
• Nature / forest bathingemerging -- Forest bathing combined with MIND diet significantly reduced total cholesterol, LDL, triglycerides, glucose, and anxiety in hypertensive older adults over four weeks. (3 studies in our library, 2 in people)

Counts are of studies in our citation library that name this marker and involve that practice. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

Diet patterns with evidence in our library

• Low-carb / ketogenicsolid -- In 34 young cardiometabolic-risk individuals, intermittent low-carb diet (≤50g/day for 7 nonconsecutive days) and intermittent calorie restriction similarly reduced weight and glucose but differed... (33 studies in our library, 16 in people)
• Mediterranean dietsolid -- In 26 older adults with cardiovascular risk phenotype, Mediterranean diet meal produced lower postprandial triglycerides than Western high-fat meal, but neither diet-plus-walking improved... (24 studies in our library, 10 in people)
• Time-restricted / fastingmixed -- RCT in 80 adults with NAFLD (3 months, 5×/wk 60-min moderate aerobic exercise) found alternate-day fasting plus exercise reduced intrahepatic triglyceride (-5.48%) more than exercise (-1.30%) or... (11 studies in our library, 5 in people)
• High-fiber / whole-grainmixed -- In 819 Polish adults, high dietary fiber (>18 g/day) interacted with FTO genotype to reduce hip circumference but paradoxically increased total and LDL cholesterol in carriers of specific alleles. (10 studies in our library, 6 in people)
• Ultra-processed (adverse)emerging -- Increased ultra-processed food consumption was associated with worsening cardiometabolic risk including weight, BMI, triglycerides, and HbA1c over 12 months in 5,373 metabolic syndrome adults. (8 studies in our library, 2 in people)
• Diet quality / healthy patternmixed -- Among 357 African American women aged 45-65, better Healthy Eating Index-2015 scores inversely associated with metabolic syndrome z-score; higher diet quality linked to lower waist circumference,... (7 studies in our library, 5 in people)

Counts are of studies in our citation library that name this marker and involve that diet pattern. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

Nutrient shortfalls

• Magnesium shortfall -- magnesium is a cofactor for the insulin receptor and for the enzymes that phosphorylate glucose, so low magnesium raises insulin resistance. The relationship runs both ways: high glucose increases urinary magnesium loss, which deepens the shortfall.
• Chromium and low dietary fiber both reduce the efficiency of glucose handling, fiber mainly by removing the brake on how fast glucose arrives.
• Vitamin D shortfall associates with worse insulin sensitivity in observational work; supplementation trials in people who are not deficient have been largely unimpressive, so treat this as a status to correct, not a lever to push.

Exposures

• Persistent organic pollutants and some plasticisers are associated with insulin resistance in population data -- an exposure signal on a marker most people read as purely dietary.
• Sleep loss and alcohol both raise fasting glucose independently of what was eaten.

Gut

• Microbiome composition shapes short-chain fatty acid production and incretin signalling, both of which affect glucose handling. This is one of the clearer routes from gut to a routine metabolic number.

Detox capacity

• The liver sets fasting glucose overnight through gluconeogenesis, so hepatic fat and hepatic insulin resistance move this number before the pancreas is in trouble. Read it alongside ALT.

How it cascades

• Hepatic fat -> hepatic insulin resistance -> the liver keeps making glucose overnight -> fasting glucose rises while post-meal numbers still look fine. This is why a normal HbA1c and a creeping fasting glucose can coexist.
• Fasting glucose is a late marker. Fasting insulin and triglyceride-to-HDL ratio usually move years earlier -- if this number is drifting, the process is already established.

What people often feel when it runs high

• The afternoon crash -- 'why do i crash after eating carbs', 'energy crash after eating', 'tired after eating not diabetic'. One of the highest-volume searched complaints there is, and one of the few with a cheap measurement behind it.
• Waking at 3am, often with a racing heart -- 'why do i wake up at 3am every night'. A nocturnal glucose dip triggers cortisol and adrenaline to correct it, and the adrenaline is what wakes you.
• Thirst and night urination that is new rather than lifelong.
• Hunger that returns within two hours of eating, and shakiness or irritability if a meal is late -- the 'hangry' pattern is a glucose-regulation pattern.
• Central weight that will not move on the same effort that used to move it.
• Skin tags, and darkened velvety skin in neck folds or armpits (acanthosis nigricans) -- visible signs of sustained high insulin, and often present long before glucose itself moves.
• Slow-healing cuts, and recurrent thrush or urinary infections.

What people often feel when it runs low

• Shakiness, sweating, sudden anxiety and difficulty concentrating that resolve within minutes of eating.
• ⚠️ A LOW FASTING GLUCOSE IS NOT AUTOMATICALLY REASSURING. Alongside low albumin or abnormal liver enzymes it can reflect reduced hepatic glucose output rather than good metabolic health.

Patterns it travels in

• FASTING GLUCOSE NORMAL + FASTING INSULIN HIGH is the single most valuable early combination in this entire panel, and the one a standard physical misses. Insulin rises for years -- often a decade -- to hold glucose normal. Measuring glucose alone declares that person healthy for the whole period when the problem is most reversible. If only one thing gets added to a basic panel, add fasting insulin.
• FASTING GLUCOSE HIGH + HBA1C NORMAL -- check the red cell indices before believing either. Anything that shortens red-cell lifespan (haemolysis, recent blood loss, iron deficiency in recovery) lowers HbA1c independently of glucose.
• FASTING GLUCOSE NORMAL + HBA1C HIGH runs the other way and is common with iron deficiency, B12 deficiency and in later pregnancy -- longer-lived red cells accumulate more glycation at the same average glucose.
• GLUCOSE HIGH + TRIGLYCERIDES HIGH + HDL LOW + WAIST UP is the metabolic-syndrome cluster. Any three of them together carry more meaning than any one alone, and they respond to the same lever.
• GLUCOSE HIGH + ALT HIGH + TRIGLYCERIDES HIGH is the liver's version of the same process -- hepatic fat and de novo lipogenesis. Triglycerides frequently move FIRST, which makes them an earlier warning than the glucose is.
• GLUCOSE HIGH + CORTISOL HIGH (especially morning) -- cortisol raises glucose by design. A glucose that only misbehaves during stressful periods, or that runs high on waking, points at the HPA axis rather than the pancreas.
• GLUCOSE HIGH + MAGNESIUM LOW is a loop worth breaking: magnesium is a cofactor for insulin signalling, and high glucose increases urinary magnesium loss, so each worsens the other.
• GLUCOSE HIGH + TSH HIGH -- an underactive thyroid slows glucose disposal and commonly travels with the same picture.

Ingredients with evidence in our library

• Magnesiumsolid -- Oral supplementation improved glycaemic control in older adults with prediabetes and insulin resistance. Magnesium is a required cofactor for the insulin receptor's own signalling, which is why the deficiency and the resistance reinforce each other. (9 studies in our library, 5 in people)
• Inositol (myo- and D-chiro-)solid -- Among the better-evidenced interventions in this library for glucose handling -- effective in prevention and treatment of gestational diabetes, and a mainstay of PCOS insulin resistance. Acts as a second messenger downstream of the insulin receptor. (13 studies in our library, 7 in people)
• Chromiummixed -- Modulates insulin receptor activity -- systematic review evidence. Effect is largest where intake was genuinely low, and unremarkable in the already-replete, which is the honest version of this claim. (8 studies in our library, 6 in people)
• Zincsolid -- The largest single ingredient signal on this marker in our library (18 rows). Zinc is structurally required to store and secrete insulin -- insulin is crystallised in the beta cell around zinc ions. (18 studies in our library, 9 in people)
• Saffron / crocinsolid -- Improved glycolipid metabolism and blood pressure in metabolic syndrome; unusually high human-trial proportion (7 of 8 rows). (8 studies in our library, 7 in people)
• Probiotics and prebiotics / inulinsolid -- Maternal and adult trials show improved glucose metabolism -- the gut route the cross-reference spec predicts, acting through short-chain fatty acids and incretin signalling. (8 studies in our library, 5 in people)
• Anthocyanins (purple corn, black rice, berries)emerging -- Reviewed alongside curcumin and resveratrol for prevention and management of metabolic dysfunction; slow carbohydrate absorption and improve insulin sensitivity. (11 studies in our library, 3 in people)
• Melatoninmixed -- GRADE-assessed evidence on blood glycaemic indices in adults. Note the direction is timing-dependent -- melatonin and a late meal together worsen glucose handling, so this is a nighttime nutrient, not a mealtime one. (9 studies in our library, 3 in people)
• Alpha-lipoic acidemerging -- Studied mostly in PCOS insulin resistance; improves insulin sensitivity and is the classic support for glucose-related nerve symptoms. (11 studies in our library, 1 in people)
• Vitamin Dmixed -- Serum 25(OH)D associated with islet function; supplementation improved insulin sensitivity in impaired fasting glucose. Association is stronger than the intervention effect. (13 studies in our library, 6 in people)

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

Movement & practices with evidence in our library

• Sleep (duration / timing)solid -- In 19 men with over five years of weekday sleep restriction averaging 373 minutes nightly, three nights of 10-hour weekend sleep improved insulin sensitivity and lowered fasting insulin, HOMA-IR,... (46 studies in our library, 19 in people)
• Aerobic / endurance (Zone-2)solid -- Meta-regression of 13 RCTs (503 metabolic dysfunction patients) found sprint interval training and moderate-intensity continuous training produced comparable HbA1c and insulin resistance... (39 studies in our library, 24 in people)
• Resistance / strength trainingsolid -- In 20 adults with type 2 diabetes over 10 weeks, 3 sessions per week of resistance training lowered HbA1c significantly more than isocaloric treadmill exercise, with both reducing fasting glucose... (34 studies in our library, 21 in people)
• HIIT / sprint intervalssolid -- Meta-regression of 13 RCTs (503 metabolic dysfunction patients) found sprint interval training and moderate-intensity continuous training produced comparable HbA1c and insulin resistance... (25 studies in our library, 18 in people)
• Meditation / mindfulnessmixed -- In 86 women with overweight or obesity, mindfulness lowered perceived stress versus an education control (-3.6 vs -1.3); fasting glucose fell 9 mg/dL within the mindfulness group only, with no... (9 studies in our library, 3 in people)
• Nature / forest bathingmixed -- A difference between the top and bottom greenness exposure quartiles within a 250 m buffer was associated with a 3.5 mg/dL decrease in fasting glucose levels (95% confidence interval: −6.2, −0.8). (5 studies in our library, 3 in people)
• Breathwork / breathingemerging -- In 16 male cyclists, 40 minutes of diaphragmatic breathing after a high-carbohydrate meal lowered heart rate and blood glucose, raised insulin, and reduced free-radical production compared with... (2 studies in our library, 2 in people)

Counts are of studies in our citation library that name this marker and involve that practice. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

Diet patterns with evidence in our library

• Time-restricted / fastingsolid -- In a 3-month trial of 90 adults with overweight or obesity, early time-restricted eating combined with calorie restriction produced greater reductions in fat mass, BMI, fasting glucose, and leptin... (41 studies in our library, 33 in people)
• Mediterranean dietsolid -- Green Mediterranean diet enriched with walnuts, green tea, and Mankai showed greater reductions in LDL cholesterol, diastolic blood pressure, insulin resistance and C-reactive protein versus... (27 studies in our library, 15 in people)
• Low-carb / ketogenicsolid -- A 2018 commentary reports PI3K-inhibitor cancer drugs raise blood glucose and insulin, which can reactivate the targeted cancer pathway, and that an SGLT2-inhibitor drug or a ketogenic diet... (24 studies in our library, 12 in people)
• High-fiber / whole-grainmixed -- A meta-analysis of randomized trials found whole grain foods lowered post-meal glucose and insulin response in healthy adults, but showed no significant effect on fasting glucose or insulin... (23 studies in our library, 8 in people)
• Diet quality / healthy patternmixed -- In 1,806 multiethnic participants, better diet quality significantly associated with higher carotenoids, adiponectin, and HDL-cholesterol; lower CRP, triglycerides, glucose, and HOMA-IR;... (16 studies in our library, 8 in people)
• Plant-based / veganmixed -- In 21 metastatic breast cancer patients on 8-week whole-food plant-based diet, weight decreased 6.6%, insulin reduced 33%, total cholesterol fell 18%, and insulin resistance improved significantly. (7 studies in our library, 5 in people)

Counts are of studies in our citation library that name this marker and involve that diet pattern. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

Nutrient shortfalls

• Iron shortfall raises HbA1c without any change in glucose, because iron-deficient red cells live longer and accumulate more glycation. An unexplained HbA1c rise with low ferritin is an iron finding, not a glucose one.
• B12 and folate shortfall can do the same thing through altered red cell turnover.

Exposures

• Anything that shortens red cell lifespan -- including some exposures and haemolysis -- lowers HbA1c and can hide genuinely high glucose.

Gut

• Malabsorption that produces iron or B12 shortfall reaches HbA1c through the red cell route above, which is why this marker cannot be read in isolation from a CBC.

Detox capacity

• Not a detox-sensitive marker directly; its confounders are haematological.

How it cascades

• HbA1c is a measure of RED CELLS as much as of sugar. It reports average glucose over the lifespan of the cell, so anything altering that lifespan alters the result -- read it beside ferritin and the red cell indices, never alone.
• Chronic high glucose -> glycation of proteins throughout the body -> the same process this test measures is happening to collagen, lens and vessel proteins. The number is a sample of a systemic process.

What people often feel when it runs high

• Everything listed under fasting glucose, but with more time behind it -- HbA1c is a three-month average, so symptoms are usually established rather than new.
• Fatigue that is constant rather than post-meal.
• Blurred vision that comes and goes as glucose swings.
• Numbness, tingling or burning in the feet, typically worse at night.
• Recurrent infections, slow healing, and gum disease.

What people often feel when it runs low

• ⚠️ AN UNEXPECTEDLY LOW HBA1C IS A RED CELL FINDING UNTIL PROVEN OTHERWISE. It means red cells are not living the full ~120 days -- haemolysis, recent bleeding, or the rapid turnover after iron or B12 repletion. It is not evidence of excellent glucose control, and reading it that way misses the actual problem.

Patterns it travels in

• HBA1C + FASTING GLUCOSE + FASTING INSULIN TOGETHER, always. Each answers a different question -- the average, the moment, and the effort being spent to hold it. Insulin is the one that moves first and the one usually left off.
• HBA1C HIGH + MCV HIGH or LOW -- read the red cell indices first. HbA1c is only as good as the assumption that red cells live 120 days, and MCV is the cheapest check on that assumption.
• HBA1C HIGH + FERRITIN LOW falsely ELEVATES HbA1c: iron-deficient red cells are older on average and accumulate more glycation. Correcting the iron lowers HbA1c with no change in glucose at all.
• HBA1C HIGH + TRIGLYCERIDES HIGH + HS-CRP HIGH is metabolic inflammation with time behind it -- the combination that most reliably predicts the trajectory.
• HBA1C HIGH + ALT HIGH -- the liver is storing the surplus. Read this pair together rather than as a metabolic finding and a separate liver finding.

Ingredients with evidence in our library

• Saffron / crocinsolid -- The strongest human-weighted signal on this specific marker in our library -- 6 of 7 rows human, including monotherapy evaluation on glycaemic endpoints. (7 studies in our library, 6 in people)
• Zincsolid -- Supplementation moved glycaemic biomarkers including HbA1c. (6 studies in our library, 4 in people)
• Magnesiumsolid -- Improved glycaemic control in prediabetes; the same insulin-signalling cofactor role as under fasting glucose. (4 studies in our library, 3 in people)
• Chromium (with vitamin C)emerging -- Combined effect on hyperlipidaemia and hyperglycaemia measured together in human trials. (4 studies in our library, 4 in people)
• Probiotics / synbioticssolid -- Post-surgical and general adult trials show anthropometric and glycaemic movement together. (4 studies in our library, 4 in people)
• Melatoninemerging -- GRADE-assessed effect on glycaemic indices; all four rows human-typed. (4 studies in our library, 4 in people)
• Resistant starchemerging -- Mango- and banana-derived resistant starch reviewed for biochemical mechanism and human effect -- feeds butyrate production and blunts the post-meal excursion that HbA1c averages. (2 studies in our library, 1 in people)
• Time-restricted eating (dietary, not a supplement)solid -- The single most-cited intervention across these rows, and it costs nothing. Effects vary by cardiometabolic phenotype, age and sex -- it is not uniformly effective, and the trials say so. (28 studies in our library, 21 in people)

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

Movement & practices with evidence in our library

• Aerobic / endurance (Zone-2)solid -- Meta-regression of 13 RCTs (503 metabolic dysfunction patients) found sprint interval training and moderate-intensity continuous training produced comparable HbA1c and insulin resistance... (20 studies in our library, 15 in people)
• Resistance / strength trainingsolid -- A meta-analysis of 16 trials totaling 2,426 middle-aged and older adults with type 2 diabetes found combined aerobic and resistance exercise was associated with better cognition, HbA1c, lipid... (16 studies in our library, 14 in people)
• Yogamixed -- Pooling 64 randomised trials with 16,797 adults, yoga was associated with modest falls in blood pressure (about 4.6/3.4 mmHg), BMI, HbA1c and LDL cholesterol; the abstract does not name the... (14 studies in our library, 8 in people)
• HIIT / sprint intervalssolid -- RCT in 23 sedentary men with type 2 diabetes (12 weeks) found both high-intensity interval training plus resistance and moderate-intensity training plus resistance improved HbA1c (-18% change),... (13 studies in our library, 11 in people)
• Meditation / mindfulnessmixed -- In 309 adults with poorly controlled diabetes, video-based mindfulness training and active stress-management education moved HbA1c identically (difference -0.01%, CI -0.36 to 0.34); mindfulness... (6 studies in our library, 4 in people)
• Nature / forest bathingemerging -- In 87 diabetic patients performing shinrin-yoku over six years, mean blood glucose fell from 179 to 108 mg/dL after forest walking, and glycated hemoglobin A1c also decreased significantly. (2 studies in our library, 1 in people)

Counts are of studies in our citation library that name this marker and involve that practice. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

Diet patterns with evidence in our library

• Time-restricted / fastingsolid -- In a secondary analysis of a randomized trial, early time-restricted eating lowered HbA1c in prediabetic adults and reduced insulin resistance in those with high cholesterol, with larger blood... (18 studies in our library, 15 in people)
• Low-carb / ketogenicmixed -- In 20 adolescents with type 1 diabetes, 6-month low-carbohydrate diet (50-80g/day) improved HbA1c from 8.1% to 7.7%, reduced BMI z-score, but decreased intake of iron, calcium, vitamin B1, and... (16 studies in our library, 9 in people)
• Mediterranean dietsolid -- Mediterranean diet with legumes, fruits, and grains raised LDL cholesterol less than ketogenic diet, which reduced triglycerides 16% versus 5% in 33 adults with prediabetes or type 2 diabetes. (14 studies in our library, 11 in people)
• High-fiber / whole-grainmixed -- In 802 prediabetic subjects, dietary fiber improved HbA1c in specific microbiota clusters over 6 months, but not uniformly, demonstrating that gut microbiota composition predicts personalized... (6 studies in our library, 4 in people)
• DASH dietemerging -- Pooling 10 of 22 randomised trials, the DASH diet was no better than comparator diets for systolic or diastolic blood pressure, but reduced urinary sodium, LDL cholesterol and HbA1c. (3 studies in our library, 2 in people)
• Ultra-processed (adverse)emerging -- Increased ultra-processed food consumption was associated with worsening cardiometabolic risk including weight, BMI, triglycerides, and HbA1c over 12 months in 5,373 metabolic syndrome adults. (2 studies in our library, 1 in people)

Counts are of studies in our citation library that name this marker and involve that diet pattern. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

Movement & practices with evidence in our library

• Sleep (duration / timing)solid -- In 19 men with over five years of weekday sleep restriction averaging 373 minutes nightly, three nights of 10-hour weekend sleep improved insulin sensitivity and lowered fasting insulin, HOMA-IR,... (46 studies in our library, 19 in people)
• Aerobic / endurance (Zone-2)solid -- Meta-regression of 13 RCTs (503 metabolic dysfunction patients) found sprint interval training and moderate-intensity continuous training produced comparable HbA1c and insulin resistance... (39 studies in our library, 24 in people)
• Resistance / strength trainingsolid -- In 20 adults with type 2 diabetes over 10 weeks, 3 sessions per week of resistance training lowered HbA1c significantly more than isocaloric treadmill exercise, with both reducing fasting glucose... (34 studies in our library, 21 in people)
• HIIT / sprint intervalssolid -- Meta-regression of 13 RCTs (503 metabolic dysfunction patients) found sprint interval training and moderate-intensity continuous training produced comparable HbA1c and insulin resistance... (25 studies in our library, 18 in people)
• Meditation / mindfulnessmixed -- In 86 women with overweight or obesity, mindfulness lowered perceived stress versus an education control (-3.6 vs -1.3); fasting glucose fell 9 mg/dL within the mindfulness group only, with no... (9 studies in our library, 3 in people)
• Nature / forest bathingmixed -- A difference between the top and bottom greenness exposure quartiles within a 250 m buffer was associated with a 3.5 mg/dL decrease in fasting glucose levels (95% confidence interval: −6.2, −0.8). (5 studies in our library, 3 in people)
• Breathwork / breathingemerging -- In 16 male cyclists, 40 minutes of diaphragmatic breathing after a high-carbohydrate meal lowered heart rate and blood glucose, raised insulin, and reduced free-radical production compared with... (2 studies in our library, 2 in people)

Counts are of studies in our citation library that name this marker and involve that practice. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

Diet patterns with evidence in our library

• Time-restricted / fastingsolid -- In a 3-month trial of 90 adults with overweight or obesity, early time-restricted eating combined with calorie restriction produced greater reductions in fat mass, BMI, fasting glucose, and leptin... (41 studies in our library, 33 in people)
• Mediterranean dietsolid -- Green Mediterranean diet enriched with walnuts, green tea, and Mankai showed greater reductions in LDL cholesterol, diastolic blood pressure, insulin resistance and C-reactive protein versus... (27 studies in our library, 15 in people)
• Low-carb / ketogenicsolid -- A 2018 commentary reports PI3K-inhibitor cancer drugs raise blood glucose and insulin, which can reactivate the targeted cancer pathway, and that an SGLT2-inhibitor drug or a ketogenic diet... (24 studies in our library, 12 in people)
• High-fiber / whole-grainmixed -- A meta-analysis of randomized trials found whole grain foods lowered post-meal glucose and insulin response in healthy adults, but showed no significant effect on fasting glucose or insulin... (23 studies in our library, 8 in people)
• Diet quality / healthy patternmixed -- In 1,806 multiethnic participants, better diet quality significantly associated with higher carotenoids, adiponectin, and HDL-cholesterol; lower CRP, triglycerides, glucose, and HOMA-IR;... (16 studies in our library, 8 in people)
• Plant-based / veganmixed -- In 21 metastatic breast cancer patients on 8-week whole-food plant-based diet, weight decreased 6.6%, insulin reduced 33%, total cholesterol fell 18%, and insulin resistance improved significantly. (7 studies in our library, 5 in people)

Counts are of studies in our citation library that name this marker and involve that diet pattern. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

Nutrient shortfalls

• Uric acid is not only a waste product -- it is one of the bloodstream's more significant antioxidants, so an unusually LOW value is not automatically good news.
• Vitamin C modestly increases uric acid excretion.

Exposures

• Fructose is the dietary driver that most people miss: its metabolism consumes ATP and generates uric acid directly, which is why sweetened drinks move this number more reliably than red meat does.
• Alcohol, particularly beer, both raises production and reduces excretion.
• Lead exposure impairs renal urate handling -- a genuine exposure route to a raised level.

Gut

• Roughly a third of uric acid is eliminated through the gut rather than the kidney, so gut function is a real part of the disposal picture.

Detox capacity

• The kidney handles most excretion, so any fall in filtration raises uric acid before creatinine looks abnormal -- making it an early kidney signal as much as a metabolic one.

How it cascades

• High fructose -> ATP consumed in the liver -> uric acid produced -> and the same process drives hepatic fat. A raised uric acid with a raised ALT is one metabolic story, not two findings.
• Uric acid tracks insulin resistance closely, because insulin reduces its renal excretion. It often moves before glucose does.

What people often feel when it runs high

• Sudden severe pain, redness and swelling in one joint -- classically the base of the big toe, often starting overnight.
• Kidney stones, or a history of them.
• Frequently NOTHING. Most people with a raised uric acid never have an attack, which is why it is a marker to interpret in context rather than to act on alone.
• Where it travels with the metabolic pattern, the symptoms are that pattern's -- rising blood pressure, central weight, the post-meal crash. Fructose is the shared driver: it is the one sugar whose metabolism generates uric acid directly.

What people often feel when it runs low

• No symptoms. Uric acid is the blood's most abundant antioxidant, and very low levels have been associated with worse outcomes in some neurological contexts -- one of the clearest U-shaped markers in the panel, where lower is not simply better.

Patterns it travels in

• URIC ACID HIGH + TRIGLYCERIDES HIGH + FASTING INSULIN HIGH is the fructose and insulin-resistance pattern. Insulin reduces uric acid excretion by the kidney, so the raised urate is often a consequence of the insulin, not an independent problem.
• URIC ACID HIGH + EGFR FALLING -- the kidney clears about two-thirds of uric acid, so reduced filtration raises it. Rising urate can be the earlier of the two signals.
• URIC ACID HIGH + BLOOD PRESSURE RISING has a plausible mechanism (endothelial nitric oxide) and remains genuinely contested as a causal chain rather than an association. Worth stating as contested, not as fact.
• URIC ACID LOW + LOW ANTIOXIDANT STATUS -- read alongside carotenoid status rather than as a stand-alone win.
• ⚠️ DIURETICS, LOW-DOSE ASPIRIN, ALCOHOL AND A RECENT FAST all raise uric acid. Check those before concluding anything dietary.

Ingredients with evidence in our library

• Vitamin Csolid -- The largest ingredient signal on this marker in our library by a wide margin -- vitamin C is uricosuric, competing with urate at the kidney's reabsorption transporter, so more is excreted. Effect size is modest and consistent rather than dramatic. (20 studies in our library, 5 in people)
• Folate, B6 and B12emerging -- Dietary intake measured explicitly in relation to hyperuricaemia -- an inverse association rather than a trial result. (6 studies in our library, 3 in people)
• Cutting fructose, especially liquid fructosesolid -- The strongest lever and not a supplement. Fructose metabolism consumes ATP and generates urate directly -- it is the only common dietary sugar that does this. Sugar-sweetened drinks and fruit juice are the concentrated source. (138 studies in our library, 75 in people)
• Molybdenum -- the cofactor worth understanding backwardsemerging -- Molybdenum is required by xanthine oxidase, the enzyme that PRODUCES uric acid. This is a cofactor to understand, not to supplement for this purpose, and the direction is the opposite of the usual assumption. (11 studies in our library, 4 in people)

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

Diet patterns with evidence in our library

• DASH dietmixed -- DASH diet combined with alcohol reduction showed additive blood pressure lowering in randomized intervention trial. (7 studies in our library, 3 in people)
• High-fiber / whole-grainemerging -- Dietary fiber lowered uremic toxins consistently across fiber types and dialysis status, but produced no significant reduction in serum trimethylamine N-oxide, uric acid or high-sensitivity... (3 studies in our library, 2 in people)
• Plant-based / veganemerging -- plant-based diet Among the 11,423 children, 1,730 (15. BACKGROUND AND OBJECTIVES: The increasing prevalence of hyperuricemia in children is a global health. (2 studies in our library, 2 in people)

Counts are of studies in our citation library that name this marker and involve that diet pattern. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

Nutrient shortfalls

• Iodine is the raw material for thyroid hormone and selenium runs the enzymes that convert T4 to active T3 -- iodine without selenium is the imbalance to avoid, not iodine itself.
• Iron shortfall impairs thyroid peroxidase, so unresolved low ferritin can hold thyroid function down independently of iodine.
• Zinc and vitamin A are both required for thyroid hormone signalling at the receptor, which is downstream of anything TSH can show.

Exposures

• Fluoride, bromide and perchlorate compete with iodine for uptake at the thyroid.
• PFAS: NASEM specifically recommends thyroid testing at higher exposure levels -- an unusual case where a chemical-exposure guideline names this exact marker.

Gut

• A meaningful share of T4-to-T3 conversion depends on gut bacterial enzymes, so microbiome disruption reaches thyroid status by a route TSH cannot see.

Detox capacity

• The liver performs much of the T4-to-T3 conversion, so hepatic function sits between a normal TSH and how someone actually feels.

How it cascades

• TSH is a PITUITARY signal, not a thyroid measurement -- it reports what the brain is asking for. It can sit in range while conversion to active T3 is poor, which is why free T3 and T4 answer a different question.
• Chronic stress -> raised cortisol -> reduced T4-to-T3 conversion and more reverse T3 -> normal TSH, low functional thyroid activity. Read TSH beside cortisol before concluding the thyroid is fine.

What people often feel when it runs high

• HIGH TSH MEANS AN UNDERACTIVE THYROID -- the counterintuitive part people get wrong constantly. TSH is the pituitary shouting; the louder it shouts, the less the thyroid is delivering.
• Cold all the time, especially hands and feet, and needing more layers than everyone else in the room.
• Fatigue that sleep does not fix -- 'why am i always tired no matter how much i sleep'.
• Weight gain of a few kilos with no change in eating, and difficulty losing it.
• Constipation, dry skin, brittle nails, and hair thinning or loss of the outer third of the eyebrow.
• Brain fog, slowed thinking, low mood -- routinely mistaken for depression, and one of the reasons thyroid belongs in a first panel.
• Heavier or longer periods; reduced fertility.
• Muscle aches, cramps, and slow relaxation of reflexes.
• Hoarse voice, puffiness around the eyes.

What people often feel when it runs low

• LOW TSH MEANS AN OVERACTIVE THYROID -- or too much thyroid medication, which is the commoner cause in anyone already treated.
• Racing or irregular heartbeat, palpitations, waking at night with the heart pounding.
• Anxiety, inner restlessness, 'wired but tired', tremor in the hands.
• Heat intolerance and sweating more than everyone else.
• Weight loss despite a good appetite; loose stools.
• Trouble falling asleep, and lighter sleep.
• ⚠️ SUPPRESSED TSH IS NOT A HARMLESS OVERSHOOT. Over years it costs bone density and raises atrial fibrillation risk -- it needs a dose conversation, not reassurance.

Patterns it travels in

• TSH ALONE IS NOT A THYROID PANEL. TSH plus free T4 plus free T3 plus TPO antibodies is. TSH can sit in range while free T3 is low, which is the commonest reason someone with every symptom is told their thyroid is fine.
• TSH HIGH + FREE T4 NORMAL is subclinical -- the pituitary is compensating and succeeding. This is the window where nutrient status (selenium, iodine, iron, zinc) is most worth checking, and where our library's evidence is strongest.
• TSH HIGH + TPO ANTIBODIES POSITIVE names the mechanism as autoimmune, which changes what is worth doing. Antibodies frequently precede the TSH change by years.
• TSH HIGH + FERRITIN LOW is a genuinely under-recognised pair -- thyroid peroxidase is a haem enzyme and needs iron to work. Iron deficiency both causes thyroid symptoms and blunts the response to thyroid replacement. Our library carries this explicitly (iron and ferritin deficiency in women with hypothyroidism and chronic lymphocytic thyroiditis).
• TSH HIGH + LDL/APOB HIGH -- hypothyroidism slows LDL-receptor clearance. Check thyroid before treating the lipids as a diet problem; correcting the thyroid often corrects the lipids.
• TSH HIGH + SODIUM LOW + CORTISOL LOW is a pattern that needs a clinician, not a supplement plan.
• TSH NORMAL + FREE T3 LOW + REVERSE T3 HIGH is the non-thyroidal illness pattern -- seen in acute illness, prolonged energy restriction and over-training. The thyroid is fine; the body is deliberately down-regulating. More food and more rest, not more iodine.
• ⚠️ BIOTIN INTERFERES WITH THE ASSAY. High-dose biotin (hair/nail supplements, 5-10 mg) can make TSH read falsely LOW and free T4 falsely HIGH -- mimicking hyperthyroidism on paper. Stop biotin 48-72 hours before the draw.

Ingredients with evidence in our library

• Seleniumsolid -- The best-evidenced nutrient on thyroid function in our library -- 18 rows here and 31 on thyroid antibodies, 17 of those human. The deiodinase enzymes that convert T4 to active T3 are selenoproteins, and glutathione peroxidase protects the gland from the peroxide it must generate to make hormone. Selenium repletion lowers TPO antibodies in multiple trials. (18 studies in our library, 11 in people)
• Iodinemixed -- The substrate hormone is literally built from -- but this is the clearest U-shaped nutrient in the whole panel. Too little causes hypothyroidism; too much also causes it, and can trigger autoimmunity in susceptible people. Do not supplement iodine on symptoms alone. (22 studies in our library, 8 in people)
• Zincsolid -- Studied alongside selenium in subclinical hypothyroidism with mechanistic and clinical evidence; required for deiodinase activity and for the receptor that reads the hormone. (9 studies in our library, 5 in people)
• Ironsolid -- Thyroid peroxidase is a haem enzyme -- without iron it cannot build hormone. Assessed in our library alongside ferritin and thyroid profile directly. (3 studies in our library, 2 in people)
• Vitamin Demerging -- Treatment moved thyroid function and autoimmunity markers together in our library's rows; status is consistently lower in autoimmune thyroid disease. (3 studies in our library, 2 in people)
• Myo-inositol with seleniumemerging -- Compared head-to-head against selenium alone in Hashimoto's with subclinical hypothyroidism -- the combination outperformed selenium alone on TSH. (18 studies in our library, 11 in people)
• Ashwagandhaemerging -- Appears in a systematic review of randomised herbal trials in hypothyroidism. Note the direction: it RAISES thyroid output, which makes it the wrong herb for anyone with a low TSH or on replacement. (2 studies in our library, 2 in people)
• Magnesiumemerging -- Severely low serum magnesium associated with positive anti-thyroglobulin antibodies -- an association, and a reason to check rather than a demonstrated lever. (1 studies in our library, 1 in people)

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

Movement & practices with evidence in our library

• Yogamixed -- In 30 adults with subclinical hypothyroidism, adding an Ayurvedic protocol of diet, yoga and a herbal formula to standard care lowered serum TSH more than standard care alone, though the extra... (5 studies in our library, 3 in people)
• Light / circadianemerging -- 4 weeks of daily 900 MHz GSM mobile phone exposure did not disrupt circadian hormone profiles of prolactin, thyroid-stimulating hormone, ACTH, or testosterone in men, though maximum growth hormone... (3 studies in our library, 1 in people)
• Sleep (duration / timing)emerging -- In 168 patients with coronary heart disease and subclinical hypothyroidism, higher TSH levels, poor sleep quality, and psychosocial stress were significant risk factors for both anxiety and... (3 studies in our library, 1 in people)

Counts are of studies in our citation library that name this marker and involve that practice. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

Nutrient shortfalls

• Magnesium is required by the enzymes that convert vitamin D to its active form, so magnesium shortfall can leave someone unresponsive to supplementation -- a common and fixable reason a dose does not move the number.
• Vitamin K2 directs the calcium that vitamin D helps absorb toward bone rather than soft tissue. The two are a pair, and supplementing D hard without K2 is the more common imbalance.
• Adequate fat is needed for absorption; vitamin D is fat-soluble and a very low-fat meal reduces uptake.

Exposures

• Obesity sequesters vitamin D in adipose tissue, so the same dose produces a smaller serum rise -- not a toxin, but the most common reason a level stays low despite supplementation.

Gut

• Fat malabsorption of any cause lowers vitamin D status, and coeliac or inflammatory bowel conditions are among the more common explanations for a stubbornly low level.

Detox capacity

• The liver performs the first hydroxylation to 25-OH vitamin D -- which is exactly what this test measures -- and the kidney performs the second. Significant impairment of either changes what the number means.

How it cascades

• Low magnesium -> impaired activation -> supplementation fails to raise the level -> the dose gets pushed higher instead of the cofactor being corrected.
• Vitamin D raises calcium absorption -> without adequate K2 that calcium has no clear destination -> which is the mechanistic argument for pairing them. Stated as mechanism, not as a proven outcome.

What people often feel when it runs high

• Excess comes from supplements, essentially never from sun.
• Nausea, vomiting, poor appetite, constipation, excessive thirst and urination.
• Confusion and weakness.
• ⚠️ THE DANGER OF TOXICITY IS HYPERCALCAEMIA AND KIDNEY STONES, not the vitamin D itself. If very high doses are being used, calcium needs measuring too.

What people often feel when it runs low

• Fatigue -- our library holds an explicit study of 25(OH)D and fatigue severity in adults.
• Aching bones and muscles, particularly the shins, hips and lower back; tenderness when pressed.
• Muscle weakness, especially getting out of a chair or climbing stairs; increased falls in older adults.
• Low mood, and mood that clearly worsens through winter.
• Getting ill often, and recovering slowly.
• Hair loss.
• Slow wound healing.
• ⚠️ MOST DEFICIENCY IS SILENT. Symptoms appear late, which is why this is one of the highest-value measurements in the panel -- deficiency is extremely common, cheap to test and cheap to fix.

Patterns it travels in

• VITAMIN D LOW + MAGNESIUM LOW -- the enzymes that convert vitamin D to its active form are magnesium-dependent. A vitamin D level that will not rise on a good dose is a magnesium question, and this is the commonest reason supplementation underperforms. 10 rows in our library pair them.
• VITAMIN D + CALCIUM + PTH read as one. Vitamin D low with PTH high means the body is pulling calcium from bone to compensate -- the finding that most justifies acting. 71 rows carry both vitamin D and calcium tags.
• VITAMIN D LOW + HS-CRP HIGH runs both ways: deficiency permits more inflammatory signalling, and inflammation lowers measured 25(OH)D. A single low reading during illness may not represent the person's baseline.
• VITAMIN D LOW + TPO ANTIBODIES POSITIVE -- a consistent association, with treatment moving function and autoimmunity markers together in our rows.
• VITAMIN D LOW + OMEGA-3 INDEX LOW is the commonest deficiency pair in this panel, and VITAL tested both in one trial.
• VITAMIN D + VITAMIN K2 -- D increases calcium absorption, K2 governs where that calcium is deposited. Mechanistically compelling and short on hard outcome trials; our library holds 4 rows. Say mechanism, not proof.
• ⚠️ VITAMIN D IS FAT-SOLUBLE -- taken without fat in the meal, much of the dose is wasted. And obesity sequesters it in adipose tissue, so a higher dose is often needed for the same blood level.

Ingredients with evidence in our library

• Vitamin D3 (cholecalciferol), taken with a fat-containing mealsolid -- 795 rows, 345 human -- the second-largest human evidence base in this library. D3 raises and maintains 25(OH)D more effectively than D2. Fat in the meal materially changes how much is absorbed. (20 studies in our library, 7 in people)
• Magnesiumsolid -- 10 rows, 5 human, and a far larger mechanistic literature. Required for both hydroxylation steps that activate vitamin D -- correcting magnesium is often what unblocks a stubborn vitamin D level. (43 studies in our library, 16 in people)
• Vitamin K2 (MK-4 / MK-7)emerging -- Directs the calcium that vitamin D makes available into bone rather than soft tissue. Our library holds phosphocalcic metabolism work covering D, K2 and nattokinase together. Mechanism is strong; outcome evidence is emerging. (10 studies in our library, 6 in people)
• Calciumsolid -- 71 rows, 22 human, including the fracture and falls prevention literature where the two were tested together rather than separately. (123 studies in our library, 34 in people)
• Sunlight -- the free onesolid -- Skin synthesis remains the dominant natural source. It is limited by latitude, season, skin tone, age, glass and sunscreen -- above roughly 37 degrees latitude, winter sun is too weak to make any regardless of exposure time. Worth saying plainly rather than implying a supplement is the only option. (819 studies in our library, 345 in people)
• Boronemerging -- Slows the clearance of active vitamin D, extending its half-life. A small and genuinely under-studied finding -- 2 rows in our library, and stated as the thin signal it is. (8 studies in our library, 2 in people)

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

Movement & practices with evidence in our library

• Sunlight / UVBsolid -- Review argues that sun exposure and vitamin D's associations with lower chronic disease risk have not been confirmed by randomized trials of vitamin D supplementation, proposing red/near-infrared... (196 studies in our library, 62 in people)
• Light / circadianmixed -- A systematic review of 35 studies found chronotherapy timing, winter season, higher latitude, circadian disruption and low vitamin D were each associated with worse outcomes from chemotherapy and... (24 studies in our library, 4 in people)
• Sleep (duration / timing)mixed -- Adults with short sleep duration had lower usual intake of magnesium, along with calcium and vitamin D, than adults with adequate sleep, an observational nutrient-status link relevant to... (9 studies in our library, 5 in people)
• Resistance / strength trainingmixed -- In 43 men with osteosarcopenia over 12 months high-intensity resistance training, lumbar spine BMD was maintained (p<0.001) and muscle mass increased significantly (SMD 1.95) with whey... (9 studies in our library, 3 in people)

Counts are of studies in our citation library that name this marker and involve that practice. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

Diet patterns with evidence in our library

• Time-restricted / fastingemerging -- In women practicing religious intermittent fasting, 16 weeks of vitamin D supplementation corrected serum vitamin D deficiency but did not significantly change leptin or interleukin-6 levels. (4 studies in our library, 1 in people)
• Diet quality / healthy patternmixed -- In a food security study, overall diet quality was poor regardless of status, and food-insecure girls and boys were at higher risk of inadequate vitamin D and magnesium intakes. (3 studies in our library, 3 in people)
• Low-carb / ketogenicemerging -- ketogenic diet 44 kg; the glucose homeostasis and lipid profile were improved significantly; serum vitamin D, LH, and TT levels were increased and the PSA levels were decreased significantly as... (2 studies in our library, 1 in people)

Counts are of studies in our citation library that name this marker and involve that diet pattern. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

What people often feel when it runs high

• "Bones, stones, groans and psychic moans" -- the old teaching phrase, and still the best summary: bone pain, kidney stones, abdominal pain and constipation, low mood and confusion.
• Excessive thirst and frequent urination.
• Fatigue and muscle weakness.
• ⚠️ A RAISED SERUM CALCIUM IS NEVER A NUTRITION FINDING AND MUST NOT BE TREATED AS ONE. It is a parathyroid, kidney or malignancy question, and it needs a doctor -- always with PTH measured alongside it. This is one of the few results in the whole panel where 'take a supplement' is the wrong response in every case.

What people often feel when it runs low

• Tingling around the mouth and in the fingers and toes.
• Muscle cramps and twitching, and in more marked cases carpopedal spasm.
• Irritability, anxiety, low mood, fatigue.
• ⚠️ CHECK MAGNESIUM AND ALBUMIN BEFORE TREATING A LOW CALCIUM. Magnesium deficiency causes a calcium that will not correct with calcium, because PTH cannot be released or heard without it. And roughly half of serum calcium is bound to albumin -- a low albumin lowers total calcium with no deficiency at all, which is why ionised or albumin-corrected calcium is the number that means something.

Patterns it travels in

• SERUM CALCIUM IS A POOR MEASURE OF CALCIUM INTAKE AND A GOOD MEASURE OF CALCIUM CONTROL. It is held in a narrow band by PTH and vitamin D at the expense of the skeleton, so someone can have a badly inadequate intake and a perfectly normal serum calcium for decades. If the question is bone, this is not the test.
• CALCIUM + PTH TOGETHER, ALWAYS. Calcium high with PTH high says parathyroid; calcium high with PTH suppressed says something else is driving it. Neither is readable from calcium alone.
• CALCIUM LOW + VITAMIN D LOW + PTH HIGH is secondary hyperparathyroidism -- the body cannibalising bone to hold serum calcium up. Our library carries 56 rows pairing vitamin D with calcium status for exactly this reason.
• CALCIUM LOW + MAGNESIUM LOW -- correct the magnesium first or the calcium will not move. 17 rows in our data pair the two.
• CALCIUM + ALBUMIN. Always read the corrected value; low albumin fakes a low calcium.
• CALCIUM + VITAMIN K2 + VITAMIN D as an intake question rather than a serum one -- D increases absorption, K2 directs where it is deposited. Supplementing D and calcium without K2 is the arrangement most often criticised, and the criticism is mechanistic rather than trial-proven.
• CALCIUM HIGH + EGFR FALLING + PHOSPHORUS HIGH belongs to kidney medicine and needs a clinician.

Ingredients with evidence in our library

• Vitamin Dsolid -- The dominant partner across our calcium rows (56, 22 human) -- it governs how much dietary calcium is absorbed at all. Correcting vitamin D usually does more for calcium status than adding calcium does. (56 studies in our library, 22 in people)
• Magnesiumsolid -- Required for PTH release and for tissue response to it -- a low calcium that will not correct is a magnesium problem until proven otherwise. (17 studies in our library, 3 in people)
• Vitamin K2 (MK-4/MK-7)emerging -- Carboxylates osteocalcin and matrix Gla protein -- the proteins that put calcium into bone and keep it out of arteries. Mechanistically strong, and the human outcome evidence is thinner than the mechanism suggests. Stated as emerging, not solid. (1 studies in our library, 0 in people)
• Dietary calcium in food formmixed -- Across 64 tagged rows including systematic-review evidence on osteoporosis. Food sources come with the cofactors; isolated high-dose calcium supplements have a more contested cardiovascular record, which is worth saying plainly. (64 studies in our library, 16 in people)
• Phosphorus balanceemerging -- Appears on 18 of our calcium rows. A very high phosphorus intake -- overwhelmingly from cola and processed food phosphate additives -- works against calcium, and is a subtraction worth making before an addition. (18 studies in our library, 2 in people)

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

Movement & practices with evidence in our library

• Sunlight / UVBmixed -- In vitamin D-deficient immigrants, daily or quarterly vitamin D supplements raised blood levels more than advised sunlight exposure, and also lowered parathyroid hormone more than sunlight advice did. (11 studies in our library, 5 in people)

Counts are of studies in our citation library that name this marker and involve that practice. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

Nutrient shortfalls

• Copper is required for ceruloplasmin, which loads iron onto transferrin -- without adequate copper, iron cannot be mobilised properly no matter how much is taken. This is the single most missed cofactor in iron work.
• Vitamin C substantially increases absorption of non-heme iron taken with it; vitamin A status also affects iron mobilisation from stores.
• Riboflavin and B12 shortfall both impair the red cell production that iron feeds into.

Exposures

• Lead competes with iron for the same intestinal transporter -- and iron shortfall increases lead absorption, so the two aggravate each other in both directions.

Gut

• Iron is absorbed in the duodenum, so coeliac disease, low stomach acid and H. pylori all reduce uptake. A non-responding iron level is a gut question before it is a dose question.
• Inflammation anywhere raises hepcidin, which locks iron inside storage cells -- producing low serum iron with normal or high ferritin. That pattern is inflammation, not deficiency, and iron will not fix it.

Detox capacity

• Ferritin is an acute-phase reactant, so it rises with inflammation independently of iron stores. A normal ferritin does not rule out iron shortfall when CRP is up.

How it cascades

• Low ferritin with normal serum iron -> stores are empty while the circulating number still looks fine -> symptoms arrive before the standard panel flags anything.
• Inflammation -> hepcidin rises -> iron is sequestered -> low serum iron, high ferritin, and supplementing iron makes nothing better. Read iron beside hs-CRP or the picture inverts.

What people often feel when it runs high

• Often SILENT for years, which is what makes iron overload dangerous.
• Fatigue and joint pain, classically in the first two knuckles.
• A bronze or grey skin tint.
• Abdominal pain, and liver enzymes drifting up.
• Reduced libido, erectile difficulty, cycles stopping.
• ⚠️ IRON IS ONE OF THE FEW NUTRIENTS WHERE SUPPLEMENTING WITHOUT TESTING CAN DO SERIOUS AND IRREVERSIBLE HARM. The body has no route to excrete a surplus. Haemochromatosis is common (roughly 1 in 200 of northern European ancestry) and often only found when the liver is already involved. Never supplement iron on symptoms alone.

What people often feel when it runs low

• Fatigue that rest does not fix -- and it appears at LOW FERRITIN, long before haemoglobin falls or anaemia exists. This is why 'my blood count was normal' does not settle the question.
• Breathlessness on stairs or mild exertion; a racing heart on standing.
• Restless legs at night -- one of the most specific and most-missed signs of low ferritin.
• Hair shedding, three to six months after the iron fell rather than at the time.
• Brittle, spooned or ridged nails.
• Cold hands and feet.
• Brain fog, poor concentration, low mood.
• Pica -- craving ice, or non-food substances.
• Headaches, dizziness, pale skin and pale inner eyelids.
• Reduced exercise capacity and slow recovery.

Patterns it travels in

• FERRITIN LOW + HS-CRP HIGH is the single most misread combination in this entire panel. Ferritin is an acute-phase protein and RISES with inflammation, so a person can be genuinely iron-deficient with a ferritin that reads normal or high. Always read ferritin against hs-CRP -- and when inflammation is present, transferrin saturation and soluble transferrin receptor tell the truth that ferritin will not.
• FERRITIN LOW + TRANSFERRIN SATURATION LOW + TIBC HIGH is unambiguous iron deficiency. TIBC rising is the body making more transport in search of iron.
• FERRITIN HIGH + SATURATION HIGH (over ~45%) is the overload pattern and needs investigating, not ignoring. FERRITIN HIGH + SATURATION NORMAL OR LOW is usually inflammation, liver disease or alcohol -- a completely different meaning from the same high number.
• IRON LOW + B12/FOLATE LOW TOGETHER -- the MCV can read perfectly normal because one raises it and the other lowers it. A normal MCV does not exclude either when both are present.
• FERRITIN LOW + TSH HIGH -- thyroid peroxidase is a haem enzyme. Iron deficiency both causes thyroid symptoms and blunts the response to thyroid replacement, and our library carries this pairing directly.
• FERRITIN LOW + COELIAC, or + heavy periods, or + PPIs, or + a plant-based diet, or -- in any man or postmenopausal woman -- GI BLOOD LOSS UNTIL PROVEN OTHERWISE. That last one is the reason unexplained iron deficiency is a doctor's question and not a supplement's.
• FERRITIN LOW + HBA1C HIGH -- iron deficiency falsely RAISES HbA1c. Correcting the iron lowers the HbA1c with no change in glucose.

Ingredients with evidence in our library

• Vitamin C, taken with the ironsolid -- 100 rows, 23 human -- including ascorbic acid as an adjunct for anaemia in erythropoietin-treated patients. Ascorbate reduces ferric to ferrous iron at the gut lining and can multiply absorption of plant-source iron several-fold. It is the cheapest and most reliable lever on this marker, and it is a timing instruction rather than a purchase. (100 studies in our library, 23 in people)
• Iron bisglycinate, or alternate-day dosingsolid -- 1,527 rows, 371 human. A dose raises hepcidin for roughly 24 hours, which BLOCKS the next dose -- so alternate-day single doses absorb better than daily split doses and cause fewer gut side effects. One of the clearest cases where how you take it beats how much you take. (1527 studies in our library, 371 in people)
• Haem iron from meat, fish and liversolid -- Absorbed by a different pathway entirely, largely immune to phytate and polyphenol inhibition, and several times better absorbed than plant iron. (1527 studies in our library, 371 in people)
• Vitamin A and beta-caroteneemerging -- Mobilise iron from stores and improve absorption -- which is why iron deficiency that resists iron sometimes turns out to be a vitamin A problem. (48 studies in our library, 18 in people)
• Coppersolid -- 238 rows, 40 human. Iron cannot be loaded onto transferrin without the copper enzymes ceruloplasmin and hephaestin. Copper deficiency produces an anaemia that looks exactly like iron deficiency and does not respond to iron -- and the commonest cause of copper deficiency is high-dose zinc. (238 studies in our library, 40 in people)
• ⚠️ Tea, coffee, calcium and phytate, as subtractionssolid -- Tannins and phytate can cut non-haem iron absorption by more than half. Separating tea and coffee from iron-containing meals by an hour is free and frequently does more than a supplement. (2486 studies in our library, 1350 in people)

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

Movement & practices with evidence in our library

• Sleep (duration / timing)emerging -- Among 251 patients with iron-deficiency anemia, restless legs syndrome occurred in 23.9%, nine times the general population rate, and was linked to poorer sleep quality and lower daytime energy. (4 studies in our library, 1 in people)
• Walking / post-meal walkmixed -- In a placebo-controlled trial of 304 adults with heart failure and iron deficiency, intravenous iron improved walking distance, symptoms and quality of life, and reduced heart failure... (3 studies in our library, 3 in people)
• Aerobic / endurance (Zone-2)emerging -- In 30 major burn patients, combined resistance and aerobic exercise lowered D-dimer and ferritin levels more than either exercise type alone, without causing abnormal blood clotting markers. (2 studies in our library, 1 in people)

Counts are of studies in our citation library that name this marker and involve that practice. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

Diet patterns with evidence in our library

• Plant-based / veganmixed -- In a review, vegetarian and vegan children faced greater risk of vitamin B12, iron, zinc, and iodine deficiency, while a varied lacto-ovo-vegetarian diet with dairy carried low risk of these... (13 studies in our library, 4 in people)

Counts are of studies in our citation library that name this marker and involve that diet pattern. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

Nutrient shortfalls

• Vitamin D and magnesium are mutually dependent -- the enzymes activating vitamin D need magnesium, and vitamin D increases magnesium absorption. Correcting one without the other is the usual reason neither improves.
• Vitamin B6 improves magnesium's entry into cells, which matters because serum magnesium is a poor guide to what is inside them.

Exposures

• Alcohol markedly increases urinary magnesium loss, as do some diuretics and proton pump inhibitors -- the drug history explains more low magnesium than diet does.

Gut

• Magnesium is absorbed along the small intestine and colon, so any malabsorption or chronic loose stool depletes it. High-dose oral magnesium that causes loose stool can be self-defeating.

Detox capacity

• Magnesium is a cofactor for glutathione synthesis, which puts it upstream of phase II conjugation capacity -- one of the quieter reasons it matters beyond muscle and sleep.

How it cascades

• SERUM MAGNESIUM IS THE WEAKNESS OF THIS TEST. Under 1% of body magnesium is in serum and the body defends that number by pulling from bone and cells, so a normal result is compatible with real depletion. Read it as a floor, not a status.
• Low magnesium -> impaired vitamin D activation -> vitamin D supplementation fails -> the dose is raised instead of the cofactor corrected.
• Low magnesium -> higher insulin resistance -> higher glucose -> more urinary magnesium loss. A self-reinforcing loop that shows up on the metabolic panel first.

What people often feel when it runs high

• Almost always caused by supplements plus reduced kidney function, not by food.
• Loose stools and abdominal cramping are the usual limit -- the gut sets its own ceiling on oral magnesium.
• ⚠️ IN KIDNEY IMPAIRMENT, MAGNESIUM ACCUMULATES AND BECOMES DANGEROUS -- low blood pressure, weakness, slowed heart rhythm. Check eGFR before supplementing at dose.

What people often feel when it runs low

• Muscle cramps, especially calves at night; eyelid twitching that goes on for days.
• Restless legs, and an urge to move the legs that is worse in the evening.
• Trouble falling asleep, and lighter, less restorative sleep -- 'racing thoughts at night can't sleep'.
• Anxiety and feeling permanently on edge -- 'why do i feel on edge for no reason'. Magnesium sits in the NMDA receptor's channel; without enough, that receptor is easier to excite.
• Palpitations and skipped beats.
• Headaches and migraine.
• Constipation.
• Fatigue -- every ATP molecule is biologically active only as a magnesium complex, so this is as literal an energy deficiency as exists.
• Painful periods, and worse premenstrual symptoms.
• ⚠️ SERUM MAGNESIUM IS A POOR TEST AND THE SYMPTOMS ARE OFTEN BETTER EVIDENCE. Under 1% of body magnesium is in serum and the body defends that number by pulling from bone and muscle, so serum stays normal well into deficiency. RBC magnesium is better; neither is great.

Patterns it travels in

• MAGNESIUM LOW + CALCIUM LOW that will not correct -- fix magnesium first. PTH cannot be released or heard without it, so calcium given alone fails. This is one of the highest-yield sequencing rules in the whole panel.
• MAGNESIUM LOW + POTASSIUM LOW that will not correct -- the same story. Magnesium deficiency opens a renal potassium channel and potassium is lost as fast as it is replaced. Our library carries 60 rows pairing the two.
• MAGNESIUM LOW + VITAMIN D LOW is a two-way dependency: the enzymes that hydroxylate vitamin D into its active form are magnesium-dependent, so vitamin D supplementation underperforms in magnesium deficiency -- and vitamin D supplementation increases magnesium demand. Correct them together.
• MAGNESIUM LOW + GLUCOSE HIGH is a self-reinforcing loop -- magnesium is required for insulin signalling, and glycosuria wastes magnesium in urine.
• MAGNESIUM LOW + TSH HIGH + HAIR LOSS appears directly in our rows (serum vitamin and mineral profiles in hypothyroidism-associated hair loss) alongside iron, zinc and calcium.
• MAGNESIUM LOW + ALCOHOL, or + PPIs, or + diuretics, or + high-dose zinc. All four deplete it, and three of them are things people take deliberately.
• MAGNESIUM + ZINC + COPPER together -- high-dose zinc lowers copper, and both compete with magnesium for absorption. 116 zinc rows and 57 copper rows sit alongside magnesium in our data.

Ingredients with evidence in our library

• Magnesium glycinate, malate or citrate (the absorbable forms)solid -- 775 rows, 241 human -- one of the largest bodies of human evidence in this library. Oxide is the cheapest and the least absorbed; it mostly works as a laxative. Form is the difference between a supplement working and passing through. (775 studies in our library, 241 in people)
• Vitamin D -- but in the right ordersolid -- 41 rows, 14 human. Vitamin D activation is magnesium-dependent, so magnesium repletion improves vitamin D response. Supplementing D at dose into a magnesium deficit increases the deficit. (41 studies in our library, 14 in people)
• Potassiumsolid -- 60 rows. The two travel together in electrolyte balance and neither corrects reliably alone. (60 studies in our library, 13 in people)
• Vitamin B6emerging -- Improves magnesium's entry into cells -- the classic pairing, and the reason many magnesium products include it. (16 studies in our library, 7 in people)
• Probiotics, via mineral absorptionemerging -- Our library holds probiotic-driven advancement in mineral absorption in the human gut, covering magnesium alongside calcium and selenium -- an indirect but real route. (30 studies in our library, 7 in people)
• Food: leafy greens, pumpkin seeds, cacao, legumes, mineral watersolid -- Our library holds a specific and easily-missed finding -- very low-mineral water is associated with worse cardiovascular measures and higher homocysteine. What is absent from drinking water counts as intake too. (828 studies in our library, 450 in people)

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

Movement & practices with evidence in our library

• Sleep (duration / timing)solid -- Adults with short sleep duration had lower usual intake of magnesium, along with calcium and vitamin D, than adults with adequate sleep, an observational nutrient-status link relevant to... (22 studies in our library, 14 in people)
• Light / circadianemerging -- In a cross-sectional study of over 10,000 US adults, higher dietary magnesium intake, measured by 24-hour recalls, was linked to a lower rate of circadian syndrome, but cannot show cause and effect. (3 studies in our library, 1 in people)
• Aerobic / endurance (Zone-2)emerging -- In a crossover trial of 15 regular exercisers, 9 days of magnesium chloride supplementation slightly reduced VO2max and sprint power output compared with placebo, showing no performance benefit... (2 studies in our library, 1 in people)

Counts are of studies in our citation library that name this marker and involve that practice. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

Diet patterns with evidence in our library

• High-fiber / whole-grainemerging -- Fermentation of dietary fiber by colonic bacteria releases and enhances absorption of minerals including magnesium. (5 studies in our library, 1 in people)
• Diet quality / healthy patternemerging -- In a food security study, overall diet quality was poor regardless of status, and food-insecure girls and boys were at higher risk of inadequate vitamin D and magnesium intakes. (3 studies in our library, 1 in people)
• Mediterranean dietemerging -- In 22 women with fibromyalgia, a Mediterranean diet enriched with tryptophan and magnesium reduced trait anxiety, mood disturbance and eating-disorder symptoms after 16 weeks, but did not improve... (3 studies in our library, 1 in people)

Counts are of studies in our citation library that name this marker and involve that diet pattern. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

Nutrient shortfalls

• Choline shortfall -- choline is required to package fat into VLDL and export it from the liver. Without enough, fat accumulates in hepatocytes and enzymes leak; controlled depletion studies in adults raise ALT and reverse it on repletion.
• Protein and amino-acid shortfall -- ALT and AST are themselves enzymes of amino-acid metabolism, so an under-fed liver can show deceptively LOW values. A low ALT is not automatically a healthy one.
• Vitamin B6 shortfall -- ALT and AST both require pyridoxal-5-phosphate as a cofactor, so B6 depletion can suppress measured activity independently of liver health. This is an assay-level effect, not a liver improving.

Exposures

• Alcohol -- classically raises AST more than ALT, and the ratio is often more informative than either number.
• PFAS -- the C8 Health Project (47,092 adults) and pooled NHANES data both associate serum PFOA and PFOS with higher ALT. See the PFAS marker.
• Medications and supplements metabolised hepatically, including some botanicals -- a rise here asks what was started recently, not only what was eaten.

Gut

• A compromised gut barrier lets endotoxin reach the liver through the portal vein, and the liver's immune response to that is a recognised driver of hepatic inflammation. This is the mechanism behind the gut-liver axis.

Detox capacity

• These enzymes are the liver's damage signal, not its detox capacity. Phase I/II throughput is better read from GGT and from what the liver is being asked to conjugate.

How it cascades

• Gut barrier loss -> endotoxin to the portal vein -> hepatic inflammation -> ALT rises. The useful question then is the gut, not the liver.
• Excess fructose or alcohol -> de novo lipogenesis -> hepatic fat -> enzyme leak. ALT is often the first ENZYME to move in metabolic dysfunction, well before glucose does.
• READ ALT WITH TRIGLYCERIDES -- they are two readouts of the same process and triglycerides frequently move FIRST. The liver makes fat from excess fructose and alcohol, packages it into VLDL, and ships it out as circulating triglycerides; what it cannot export stays behind as hepatic fat, and only then do enzymes leak. So a raised triglyceride with a normal ALT can be the earlier warning, not the milder one. A dietary fructose restriction trial measured exactly this chain -- liver fat and de novo lipogenesis both fell together.
• The reverse direction matters too: hepatic fat drives hepatic insulin resistance, which raises VLDL output, which raises triglycerides further. It is a loop, not a one-way arrow, which is why the two numbers tend to rise and fall together.
• Muscle injury or hard training raises AST (and CK) without any liver involvement at all -- check the timing of the last heavy session before reading a lone AST rise as hepatic.

What people often feel when it runs high

• Usually NOTHING. The liver has no pain fibres in its tissue, and enzymes can run raised for years silently -- which is the entire argument for measuring them.
• Where symptoms exist: a dull ache or fullness under the right ribs, fatigue, and nausea.
• Fatigue disproportionate to activity is the commonest complaint that turns out to have a raised ALT behind it.
• Itching without a rash, and yellowing of the eyes, belong to the more advanced picture and need a doctor rather than a supplement.
• ⚠️ ALT ABOVE AST usually points at fatty liver; AST ABOVE ALT (roughly 2:1 or more) points at alcohol. The RATIO carries information the individual numbers do not.
• ⚠️ A HARD WORKOUT RAISES AST AND CK FOR DAYS -- muscle contains AST too. Do not draw these within 48-72 hours of heavy training and then interpret them as liver.

What people often feel when it runs low

• A low ALT is not usually a concern in itself, but a persistently very low ALT can reflect vitamin B6 deficiency -- ALT requires pyridoxal-5-phosphate to function, so the assay under-reads without it. Also seen in frailty and low muscle mass.

Patterns it travels in

• READ ALT WITH TRIGLYCERIDES -- they are two readouts of the same process, and TRIGLYCERIDES FREQUENTLY MOVE FIRST. Our library holds the fructose-restriction work in which liver fat and de novo lipogenesis fell together (25 rows, 12 human-typed), and 66 rows pairing triglycerides with liver fat. If triglycerides are up and ALT is normal, the process has already started.
• ALT HIGH + TRIGLYCERIDES HIGH + FASTING INSULIN HIGH + WAIST UP is metabolic fatty liver, and it is by far the commonest cause of a raised ALT. The lever is metabolic -- fructose and alcohol out, weight down -- not a liver supplement.
• AST:ALT RATIO ABOVE 2 + GGT HIGH + MCV HIGH is the alcohol pattern, and it is worth recognising before anything else is tried.
• ALT HIGH + FERRITIN HIGH + TRANSFERRIN SATURATION HIGH -- consider iron overload rather than assuming inflammation. Our library holds ferritin and liver steatosis in children with metabolic clustering explicitly. This one changes what should happen next.
• ALT HIGH + PLATELETS FALLING + ALBUMIN FALLING is the combination that means the liver's synthetic function is affected, not just irritated. That is a clinician's finding, not a nutrition one.
• ALT HIGH + NEW MEDICATION OR SUPPLEMENT -- always ask. Statins, paracetamol, and a number of botanicals raise it, and the answer is often simply stopping something.
• ALT NORMAL DOES NOT EXCLUDE FATTY LIVER. Imaging finds it in plenty of people whose enzymes are perfectly normal.

Ingredients with evidence in our library

• Cutting fructose -- the best-evidenced lever, and it is a subtractionsolid -- Our library holds dietary fructose restriction measured directly on liver fat and de novo lipogenesis, with 12 human-typed rows. Liquid fructose -- sugar-sweetened drinks and juice -- is the concentrated source. Nothing purchasable in this library outperforms it. (25 studies in our library, 12 in people)
• Cholinesolid -- 21 rows. Choline is required to package fat into VLDL and export it from the liver; without enough, fat accumulates regardless of how little is eaten. One of the commonest inadequate intakes in Western diets, and eggs and liver are the dense sources. (21 studies in our library, 5 in people)
• Probiotics, synbiotics and prebiotic fibresolid -- 31 rows across the probiotic and prebiotic tags, measured directly on liver enzymes in non-alcoholic fatty liver disease. The gut-liver axis is a real route: the portal vein delivers gut endotoxin to the liver first. (31 studies in our library, 6 in people)
• Artichoke leaf extractemerging -- 12 rows, 5 human -- reduced steatosis and decreased liver size in pre-bariatric patients. One of the better-evidenced botanicals on this specific marker in our library. (12 studies in our library, 5 in people)
• Glutathione precursors (NAC, glycine, sulfur amino acids)emerging -- 50 rows across the glutathione and NAC tags -- but note the honesty: almost none are human-typed on this marker. Per the cross-reference spec's antioxidant rule, the framing is supplying what the liver builds glutathione FROM, not supplying glutathione. (34 studies in our library, 0 in people)
• Vitamin Emixed -- 13 rows, 9 human. Has the strongest trial record of any supplement in non-alcoholic steatohepatitis specifically, though at doses that carry their own debate. (7 studies in our library, 5 in people)
• Vitamin B6emerging -- 10 rows. Not a treatment -- a reading correction. ALT requires P5P as its cofactor, so B6 deficiency makes the enzyme under-report and can hide a liver problem. (10 studies in our library, 3 in people)

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

Movement & practices with evidence in our library

• Aerobic / endurance (Zone-2)solid -- In 41 adults after 12 weeks of endurance training, waist circumference decreased significantly but computed tomography-measured hepatic lipid content was unchanged, though correlations existed... (20 studies in our library, 14 in people)
• Resistance / strength trainingmixed -- In 64 NAFLD patients, 3 months resistance training 3x/week reduced hepatorenal ultrasound index stiffness score more than stretching (-0.25 vs -0.05, P=0.017); reduced ferritin and cholesterol. (12 studies in our library, 5 in people)
• Light / circadianemerging -- Review presented lifestyle modifications beyond diet and exercise for NAFLD: light alcohol, coffee consumption, circadian alignment, and adequate sleep duration. (6 studies in our library, 1 in people)
• Sleep (duration / timing)emerging -- Review presented lifestyle modifications beyond diet and exercise for NAFLD: light alcohol, coffee consumption, circadian alignment, and adequate sleep duration. (2 studies in our library, 1 in people)

Counts are of studies in our citation library that name this marker and involve that practice. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

Diet patterns with evidence in our library

• Mediterranean dietmixed -- Systematic review found Mediterranean diet and intermittent fasting in MASLD patients reduced body weight, BMI, waist circumference, improved glycemic control and inflammation, with benefits on... (15 studies in our library, 5 in people)
• Time-restricted / fastingmixed -- In a 16-week trial of 333 adults with overweight or obesity and fatty liver disease, time-restricted eating reduced hepatic steatosis by 25.8% versus 0.7% with standard care, comparable to calorie... (12 studies in our library, 8 in people)
• Low-carb / ketogenicemerging -- In 58 children with obesity on 4-month ketogenic diet, weight loss averaged 6.45 kg with BMI reduction of 3.12 kg/m2, hepatic steatosis cases halved, and metabolic syndrome cases decreased threefold. (11 studies in our library, 1 in people)
• Ultra-processed (adverse)mixed -- Ultra-processed food intake was associated with 43% increased NAFLD risk, 18% elevated fibrosis/cirrhosis risk, and 50% severe liver disease risk with adverse liver biomarkers in UK Biobank... (8 studies in our library, 6 in people)
• High-fiber / whole-grainemerging -- In 72 Canadian adults with high cholesterol, PFOSA, PFOS, PFOA and PFHxS were detected in all participants' blood, and a 4-week dietary fiber intervention was linked to a drop in long-chain PFAS... (6 studies in our library, 2 in people)
• DASH dietemerging -- In postmenopausal women, DASH diet adherence was associated with improved bone marrow composition and slower osteoporosis progression, extending the diet's benefits from blood pressure toward... (4 studies in our library, 2 in people)

Counts are of studies in our citation library that name this marker and involve that diet pattern. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

Nutrient shortfalls

• Albumin depends on protein intake AND on the liver's capacity to synthesise it, so a low value is ambiguous by design -- it can mean too little protein, an inflamed liver, or losses through gut or kidney.
• Alkaline phosphatase is a zinc metalloenzyme -- it will not work without zinc, so an unexplained LOW ALP is one of the more useful practical hints of zinc shortfall.
• Magnesium is also required for ALP activity, so low-normal ALP is worth reading alongside magnesium status rather than alone.

Exposures

• Anything driving cholestasis raises ALP and, with it, bilirubin -- the pattern of which of these move together matters more than any single value.

Gut

• Intestinal alkaline phosphatase is a distinct isoenzyme produced in the gut, where it detoxifies endotoxin at the barrier. A total ALP is a mixture of sources, and that is one reason a single number can mislead.
• Protein-losing conditions in the gut lower albumin without any liver problem at all.

Detox capacity

• Bilirubin is the end product of haem breakdown and is conjugated by the liver before excretion, so it reads conjugation and flow. It is also a genuine endogenous antioxidant -- mildly raised unconjugated bilirubin, as in Gilbert's, is not the same finding as a raised conjugated fraction.

How it cascades

• Inflammation anywhere -> the liver shifts synthesis toward acute-phase proteins -> albumin falls. Read a low albumin alongside an inflammatory marker before reading it as nutrition.
• Zinc shortfall -> ALP falls -> and the same shortfall shows up in taste, immune function and skin. One low enzyme, several visible consequences.
• Cholestasis -> ALP and conjugated bilirubin rise together, while ALT and AST may stay near normal -- the pattern separates a flow problem from a damage problem.

What people often feel when it runs high

• HIGH BILIRUBIN: yellowing of the eyes, and dark urine. Most commonly Gilbert's syndrome -- a harmless inherited variant affecting several percent of people, in which bilirubin rises with fasting, illness or stress and nothing is wrong.
• HIGH ALP: bone pain or liver/bile symptoms. Which one it is depends entirely on GGT -- ALP up with GGT up is liver or bile; ALP up with GGT normal is bone. In children and teenagers a high ALP is normal growth.
• HIGH GLOBULIN with low albumin (a reversed A/G ratio) reflects chronic inflammation or immune activation and deserves a clinician's look.

What people often feel when it runs low

• LOW ALBUMIN: swelling of ankles and feet, puffiness around the eyes, fatigue, poor wound healing, muscle loss.
• Low albumin is one of the strongest general predictors of poor outcomes there is -- it reflects protein intake, liver synthesis, kidney loss and inflammation all at once.
• LOW ALP can reflect zinc or magnesium deficiency -- alkaline phosphatase is a zinc-dependent enzyme, so a persistently low ALP is a genuine and widely-missed zinc signal. 108 of our rows on this marker carry the zinc tag, the largest single association.
• LOW BILIRUBIN carries no symptoms; it is mildly associated with lower antioxidant capacity, since bilirubin is itself an antioxidant.

Patterns it travels in

• ALBUMIN CHANGES THE MEANING OF OTHER RESULTS -- read it first. Roughly half of serum calcium and most serum zinc are albumin-bound, so a low albumin fakes a low calcium and a low zinc. This is the single most useful thing albumin does on a panel.
• ALBUMIN LOW + HS-CRP HIGH is the acute-phase response seen from both directions -- CRP is a positive acute-phase protein, albumin a negative one. Together they suggest a sustained process.
• ALP LOW + ZINC LOW -- alkaline phosphatase is a zinc metalloenzyme. A low ALP is one of the few genuinely useful functional zinc signals available on a standard panel, and it costs nothing extra.
• ALP HIGH + GGT HIGH = liver/bile. ALP HIGH + GGT NORMAL = bone. This single pairing resolves the commonest ambiguity in a liver panel.
• ALP HIGH + VITAMIN D LOW + PTH HIGH + CALCIUM LOW-NORMAL is the bone-turnover picture of secondary hyperparathyroidism.
• BILIRUBIN HIGH + EVERYTHING ELSE NORMAL + rises with fasting = Gilbert's. Common, benign, and a frequent cause of unnecessary alarm.
• ALBUMIN LOW + PROTEINURIA points at the kidney losing it rather than the liver failing to make it -- check urinalysis before assuming liver.

Ingredients with evidence in our library

• Zincsolid -- 108 rows, 22 human -- the largest association on this marker group, driven by ALP's absolute dependence on zinc as a cofactor. Repletion raises a low ALP. This is a mover in the most literal sense: no zinc, no enzyme. (108 studies in our library, 22 in people)
• Adequate dietary proteinsolid -- Albumin is made from amino acids. In older adults especially, a low albumin is frequently an intake and absorption question before it is a disease question -- and it is the one intervention that addresses the marker directly. (475 studies in our library, 147 in people)
• Magnesiumemerging -- A cofactor alongside zinc for alkaline phosphatase activity. (6 studies in our library, 0 in people)
• Vitamin Dsolid -- 9 rows, 5 human. Governs the bone-turnover side of ALP -- deficiency raises ALP through secondary hyperparathyroidism, and correcting it brings ALP down. (9 studies in our library, 5 in people)
• Selenium and copperemerging -- 38 rows combined. Our library holds serum albumin mediating associations between heavy metals and systemic inflammation indices -- albumin is part of how the body buffers metal exposure, which is why it appears in the toxicity work. (22 studies in our library, 7 in people)

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

Movement & practices with evidence in our library

• Sleep (duration / timing)emerging -- Prospective trial of 37 breast cancer post-surgery patients: 12-week Tai Chi Chuan significantly decreased waist-hip ratio, improved motor function and sleep quality, increased HDL and albumin. (3 studies in our library, 2 in people)
• Light / circadianemerging -- In 10 young versus 10 elderly men over 24 hours, non-SHBG-bound testosterone showed significant circadian rhythm in young men but blunted rhythmicity in elderly men with lower mean levels. (3 studies in our library, 1 in people)

Counts are of studies in our citation library that name this marker and involve that practice. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

What people often feel when it runs high

• HIGH CREATININE / LOW eGFR: usually SILENT until filtration is well down -- which is exactly why it is measured rather than felt.
• Later: swelling in ankles and around the eyes, foamy urine, fatigue, poor appetite, itching, night urination, high blood pressure.
• ⚠️ CREATININE IS PRODUCED BY MUSCLE, so a muscular person reads 'worse' and a frail person reads 'better' at the same true filtration rate. Cystatin C does not depend on muscle mass and is the better test where body composition is unusual.
• ⚠️ CREATINE SUPPLEMENTATION RAISES CREATININE WITHOUT HARMING THE KIDNEY -- it is a measurement artefact, not damage. Our library carries a systematic review of renal safety in adolescents. So does a big steak the night before, and so does dehydration.

What people often feel when it runs low

• A low creatinine usually reflects low muscle mass rather than excellent kidneys, and in older adults it can hide meaningfully reduced filtration.

Patterns it travels in

• eGFR + CYSTATIN C TOGETHER where the answer matters. When creatinine-based and cystatin-based estimates disagree, the truth is usually between them -- and the disagreement itself is information about muscle mass.
• eGFR FALLING + URINE ALBUMIN-TO-CREATININE RATIO RAISED is the pair that matters. ALBUMINURIA APPEARS FIRST, often years before eGFR moves, and a urine ACR is cheap. Ordering eGFR without it is the commonest gap in kidney screening.
• eGFR FALLING + URIC ACID HIGH -- the kidney clears about two-thirds of uric acid, so urate can be the earlier signal.
• eGFR FALLING + POTASSIUM HIGH + PHOSPHORUS HIGH + PTH HIGH is the mineral picture of reduced filtration and belongs to a clinician.
• ⚠️ eGFR CHANGES WHAT IS SAFE TO SUPPLEMENT. Magnesium and potassium accumulate when filtration is reduced, and both become genuinely dangerous. Check eGFR before recommending either at dose -- this is the marker with the most direct bearing on whether our own advice is safe.
• eGFR FALLING + BLOOD PRESSURE HIGH + GLUCOSE HIGH is the commonest cause combination by a wide margin, and all three are the same conversation.
• BUN HIGH + CREATININE NORMAL usually means dehydration or a high protein intake rather than a kidney problem.

Ingredients with evidence in our library

• Sodium reductionsolid -- 31 rows, 17 human -- the largest signal on this marker in our library. Lowering sodium lowers glomerular pressure and albuminuria, and it is the intervention with the most consistent evidence behind it. (31 studies in our library, 17 in people)
• Dietary potassium (from food, and only with a known eGFR)mixed -- 22 rows -- urinary and dietary potassium measured against microvascular complications. ⚠️ The direction reverses in reduced filtration: potassium becomes a risk rather than a benefit. This is the clearest example in the whole panel of an intervention whose safety depends on another marker. (22 studies in our library, 5 in people)
• Magnesiummixed -- A randomised controlled trial in our library on magnesium supplementation and vascular calcification in chronic kidney disease. Same caution: accumulation risk when filtration is reduced. (4 studies in our library, 1 in people)
• Probiotics (the gut-kidney axis)emerging -- 8 rows -- probiotics with AST-120 on renal function. Gut bacteria generate the uraemic toxins indoxyl sulfate and p-cresyl sulfate that the kidney must then clear, so changing the gut changes the load. (8 studies in our library, 2 in people)
• Vitamin B12emerging -- 8 rows -- effect on glycaemic control, albuminuria and peripheral neuropathy measured together. (8 studies in our library, 3 in people)
• Vitamin Demerging -- An umbrella review in our library on efficacy and safety in diabetic kidney disease. (7 studies in our library, 2 in people)

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

Movement & practices with evidence in our library

• Light / circadianemerging -- Among 2,053 middle-aged and older Chinese adults followed a median 4.0 years, 552 developed circadian syndrome, and each standard deviation rise in normalized creatinine-to-cystatin C ratio... (3 studies in our library, 1 in people)
• Aerobic / endurance (Zone-2)emerging -- In 142 CKD stage 3-4 patients over 12 months, aerobic exercise training without lean mass changes showed similar GFR estimates using cystatin-C and creatinine-based formulas at both baseline and... (3 studies in our library, 1 in people)
• Resistance / strength trainingemerging -- In 40 CKD patients with obesity/metabolic syndrome treated 6 months with aerobic and resistance exercise, 30 responders (weight loss >5%) reduced albuminuria from 222 to 89 mg/g but showed... (2 studies in our library, 2 in people)
• Spiritual / religious practiceemerging -- In an integrative review of chronic kidney disease patients, spirituality and religiosity were linked to better coping, quality of life, mental health, and improved kidney function after... (2 studies in our library, 1 in people)

Counts are of studies in our citation library that name this marker and involve that practice. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

Diet patterns with evidence in our library

• Mediterranean dietemerging -- A meta-analysis of 10 studies in 1,073 nondialysis CKD patients found the Mediterranean diet modestly improved kidney function (GFR), though study results varied widely, and high-phenolic olive... (3 studies in our library, 2 in people)
• High-fiber / whole-grainemerging -- This review argues that chronic kidney disease patients need enough dietary fiber from vegetables and fruit, since low-fiber diets favor gut bacteria that raise the toxin indoxyl sulphate, which... (3 studies in our library, 2 in people)
• DASH dietemerging -- DASH diet reduced 24-hour daytime and nighttime systolic and diastolic blood pressure significantly more than control; greater effects in adults with low-grade albuminuria. (2 studies in our library, 1 in people)

Counts are of studies in our citation library that name this marker and involve that diet pattern. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

What people often feel when it runs high

• HIGH POTASSIUM: palpitations, muscle weakness, and in severe cases dangerous heart rhythms. ⚠️ THIS IS ONE OF THE FEW GENUINELY URGENT RESULTS ON A ROUTINE PANEL. Reduced kidney function, ACE inhibitors and potassium supplements are the usual causes -- and a haemolysed sample is a very common false positive worth excluding before anyone panics.
• HIGH SODIUM: thirst, dry mouth, confusion -- almost always dehydration rather than salt intake.

What people often feel when it runs low

• LOW SODIUM: headache, nausea, confusion, fatigue, muscle cramps. Severe drops cause seizures. Commonest causes are medication (diuretics, SSRIs), and -- increasingly -- drinking large volumes of plain water during endurance events.
• LOW POTASSIUM: muscle weakness and cramps, constipation, palpitations and skipped beats, fatigue.
• ⚠️ A LOW POTASSIUM THAT WILL NOT CORRECT IS A MAGNESIUM PROBLEM. Magnesium deficiency opens a renal channel that dumps potassium as fast as it is replaced -- 17 rows in our library pair the two, and it is the single most useful electrolyte rule there is.

Patterns it travels in

• POTASSIUM LOW + MAGNESIUM LOW -- correct magnesium first or the potassium will not hold. The rule worth teaching before any other.
• SODIUM LOW + high water intake + endurance exercise is exercise-associated hyponatraemia, and it is caused by drinking TOO MUCH plain water, not too little. Our library holds sweat electrolyte profiles during daily activity (83 potassium rows, 96 sodium rows) -- sweat carries both, and replacing only the water is what causes the problem.
• SODIUM-TO-POTASSIUM RATIO IS MORE INFORMATIVE THAN SODIUM ALONE. Most Western diets are high sodium and low potassium; the ratio captures that in one number, and our hs-CRP rows carry it too.
• POTASSIUM HIGH + eGFR LOW is the combination to take seriously and act on quickly.
• CHLORIDE + BICARBONATE together describe acid-base status; low bicarbonate with a normal anion gap points at bicarbonate loss.
• GLUCOSE HIGH + ELECTROLYTES DISORDERED -- our library holds the impact of fasting plasma glucose on electrolyte imbalance directly. Glycosuria drags sodium, potassium and magnesium out with it.

Ingredients with evidence in our library

• Magnesium -- the permissive mineralsolid -- 17 rows, 7 human, including genetic tubular disorders where the mechanism is unambiguous. Nothing else on this panel corrects reliably while magnesium is low. (17 studies in our library, 7 in people)
• Dietary potassium (vegetables, fruit, legumes, potatoes)solid -- 83 rows, 19 human. Food potassium comes with the bicarbonate precursors that supplements lack, and it is not subject to the dose limits placed on potassium supplements. ⚠️ Only with a known eGFR. (83 studies in our library, 19 in people)
• Sodium, replaced deliberately during heavy sweatingsolid -- 96 rows, 37 human. Our library measures sweat electrolyte profiles directly -- sweat is not plain water, and replacing it with plain water is what produces exercise-associated hyponatraemia. The correct framing is replacing what was lost, not restricting salt universally. (96 studies in our library, 37 in people)
• Chloride, and bicarbonate for acid loademerging -- 17 rows on chloride; our library also holds sodium bicarbonate therapy in metabolic acidosis and bicarbonate with cholecalciferol and protein together. (17 studies in our library, 3 in people)

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

Nutrient shortfalls

• Iron shortfall makes cells SMALL (low MCV); B12 or folate shortfall makes them LARGE (high MCV). Cell size is the first fork in the road, and it points at different nutrients.
• Copper shortfall causes an anaemia that looks like iron deficiency and does not respond to iron -- an uncommon cause that is nearly always missed because copper is rarely measured.
• Vitamin B6 is required for haem synthesis itself.

Exposures

• Lead interferes with haem synthesis directly and is a classic cause of anaemia with basophilic stippling.

Gut

• Almost every nutritional anaemia is an absorption story before it is an intake story -- coeliac disease, low stomach acid and H. pylori all reach the red cell indices.

Detox capacity

• Red cell turnover produces bilirubin, so accelerated breakdown raises unconjugated bilirubin without any liver problem.

How it cascades

• A normal MCV can hide combined deficiency: iron shrinking cells and B12 enlarging them can average out to a normal-looking size. RDW -- the spread of cell sizes -- catches what the average hides, which is why it is worth reading.
• Small cells -> check ferritin, and read it beside CRP because inflammation inflates it. Large cells -> check B12 with methylmalonic acid, and folate.

What people often feel when it runs high

• HIGH HAEMOGLOBIN/HAEMATOCRIT: headaches, flushing, itching after a hot shower, dizziness.
• Commonest causes are dehydration (a false rise), smoking, sleep apnoea, altitude and testosterone therapy -- all worth asking about before anything rarer.

What people often feel when it runs low

• LOW HAEMOGLOBIN: fatigue, breathlessness on stairs, palpitations, pale skin and pale inner eyelids, headaches, cold hands and feet, poor concentration.
• LOW MCV (small cells) points at iron deficiency, or at thalassaemia trait if iron studies are normal.
• HIGH MCV (large cells) points at B12 or folate deficiency, alcohol, or an underactive thyroid.
• ⚠️ SYMPTOMS OF IRON DEFICIENCY START AT LOW FERRITIN, NOT AT LOW HAEMOGLOBIN. A perfectly normal CBC does not exclude iron deficiency, and 'your blood count is fine' is the sentence that sends people away still exhausted.

Patterns it travels in

• MCV IS THE MOST INFORMATIVE NUMBER ON THE CBC AND THE ONE MOST OFTEN IGNORED. Small = iron. Large = B12 or folate. It sorts the two commonest deficiencies in one number.
• ⚠️ THE TRAP: IRON DEFICIENCY AND B12 DEFICIENCY TOGETHER GIVE A NORMAL MCV, because one lowers it and the other raises it. A normal MCV excludes neither when both are present -- and both together is common in the same people (coeliac disease, gastric surgery, plant-based diets, autoimmune gastritis).
• MCV LOW + FERRITIN LOW + RDW HIGH is iron deficiency in progress. RDW rises early because new small cells sit alongside older normal ones -- it is often the first thing to move.
• MCV LOW + FERRITIN NORMAL + RDW NORMAL suggests thalassaemia trait rather than iron deficiency, and giving iron on that misreading does harm.
• MCV HIGH + MMA HIGH = B12. MCV HIGH + MMA NORMAL + HOMOCYSTEINE HIGH = folate. MCV HIGH + GGT HIGH = alcohol.
• HAEMOGLOBIN LOW + HS-CRP HIGH + FERRITIN NORMAL-OR-HIGH is anaemia of inflammation, not iron deficiency, and iron will not fix it. Our library names this pattern directly (anaemia, micronutrient deficiency and elevated inflammation biomarkers in women).
• HAEMOGLOBIN LOW + COPPER LOW -- copper deficiency causes an anaemia that looks exactly like iron deficiency and does not respond to iron. Its commonest cause is long-term high-dose zinc.
• HAEMATOCRIT HIGH + a morning headache + snoring -- ask about sleep apnoea before treating the blood.

Ingredients with evidence in our library

• Iron, with vitamin C, dosed alternate-daysolid -- 196 rows, 101 human -- the dominant signal. Vitamin C multiplies non-haem absorption; alternate-day dosing beats daily because a dose raises hepcidin for about 24 hours and blocks the next one. (17 studies in our library, 6 in people)
• Vitamin B12solid -- 55 rows, 16 human. Corrects a high MCV -- and must be established before folate is pushed, or the blood picture improves while nerve damage continues. (55 studies in our library, 16 in people)
• Folate (B9)solid -- 36 rows, 10 human, including erythrocyte folate measured directly rather than serum folate -- red cell folate reflects months of status rather than this week's intake. (36 studies in our library, 10 in people)
• Riboflavin (B2)emerging -- 16 rows, 7 human, including a paper finding riboflavin deficiency HIGHLY PREVALENT in females and children across both high and low/middle income countries. B2 is required to mobilise iron from ferritin -- so riboflavin deficiency produces an iron-resistant anaemia. This is the quietest genuinely useful finding in the whole CBC group. (16 studies in our library, 7 in people)
• Vitamin Asolid -- 20 rows, 16 human -- one of the highest human proportions in this library. Vitamin A mobilises iron from stores; deficiency produces anaemia that iron alone does not correct. (20 studies in our library, 16 in people)
• Coppersolid -- 17 rows. Required to load iron onto transferrin. Without it, iron cannot be transported no matter how much is given. (17 studies in our library, 4 in people)
• Zincsolid -- 43 rows, 24 human -- measured alongside anaemia and inflammation biomarkers together. (43 studies in our library, 24 in people)

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

Movement & practices with evidence in our library

• Walking / post-meal walkmixed -- This review reports that testosterone treatment of older hypogonadal men improved sexual function, walking, mood, bone mineral density, and hemoglobin, but did not improve their sense of vitality... (4 studies in our library, 3 in people)
• Yogamixed -- Ten weeks of elderly-customized hatha yoga in 14 women aged 70-80 years increased albumin and decreased fibrinogen, high-sensitivity C-reactive protein, and erythrocyte sedimentation rate. (4 studies in our library, 4 in people)
• Sleep (duration / timing)emerging -- Among 251 patients with iron-deficiency anemia, restless legs syndrome occurred in 23.9%, nine times the general population rate, and was linked to poorer sleep quality and lower daytime energy. (2 studies in our library, 1 in people)
• Resistance / strength trainingemerging -- In 21 type 1 diabetic men trained twice weekly for 3 months, either aerobic or resistance training showed no significant change in hemoglobin A1c or cardiovascular risk factors. (2 studies in our library, 2 in people)

Counts are of studies in our citation library that name this marker and involve that practice. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

Diet patterns with evidence in our library

• Mediterranean dietemerging -- Mediterranean diet with legumes, fruits, and grains raised LDL cholesterol less than ketogenic diet, which reduced triglycerides 16% versus 5% in 33 adults with prediabetes or type 2 diabetes. (3 studies in our library, 1 in people)
• High-fiber / whole-grainemerging -- In 356 Chinese type 2 diabetic patients, higher habitual dietary fiber intake was associated with distinct fecal microbiota changes and reduced HbA1c through reduced Desulfovibrio abundance. (3 studies in our library, 2 in people)
• Low-carb / ketogenicemerging -- Mediterranean diet with legumes, fruits, and grains raised LDL cholesterol less than ketogenic diet, which reduced triglycerides 16% versus 5% in 33 adults with prediabetes or type 2 diabetes. (2 studies in our library, 1 in people)

Counts are of studies in our citation library that name this marker and involve that diet pattern. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

What people often feel when it runs high

• Usually an active infection -- fever, feeling unwell, a specific site that hurts.
• Neutrophils raised: bacterial infection, inflammation, tissue injury, or simply steroids or acute stress (a genuine and often-forgotten cause).
• Lymphocytes raised: viral infection more often than bacterial.
• Eosinophils raised: allergy, asthma, drug reactions, and parasites.
• ⚠️ A PERSISTENTLY HIGH COUNT WITH NO INFECTION NEEDS A DOCTOR, not a supplement.

What people often feel when it runs low

• Frequent or lingering infections; mouth ulcers; slow recovery.
• Low lymphocytes travel with chronic stress and high cortisol, with poor nutrition, and with zinc deficiency.
• ⚠️ A LOW NEUTROPHIL COUNT CAN BE A NORMAL ETHNIC VARIANT (benign ethnic neutropenia, common in people of African ancestry) and is not always a problem. It can also be a drug effect -- always ask what someone is taking.

Patterns it travels in

• THE NEUTROPHIL-TO-LYMPHOCYTE RATIO CARRIES MORE INFORMATION THAN EITHER COUNT ALONE, and it is free -- it is already on every CBC. A rising ratio with a normal total WBC tracks systemic inflammatory burden and stress, and reads as normal on any automated flag.
• NLR HIGH + HS-CRP HIGH is inflammation confirmed two ways, one of them at no extra cost.
• LYMPHOCYTES LOW + CORTISOL HIGH -- cortisol redistributes lymphocytes out of circulation. A low lymphocyte count in someone under sustained stress is often that, not immune deficiency.
• EOSINOPHILS HIGH + IgE HIGH is the allergic picture; EOSINOPHILS HIGH with travel history is a parasite question.
• WBC LOW + MCV HIGH + PLATELETS LOW together suggests a marrow or B12 problem rather than three separate findings, and needs a clinician.
• WBC NORMAL DOES NOT MEAN NO INFLAMMATION -- it is a count of cells, not a measure of activation.

Ingredients with evidence in our library

• Zincsolid -- 17 rows, 9 human -- including a randomised trial of zinc supplementation on inflammation and gut integrity markers. Zinc is required for lymphocyte development and function, and deficiency shrinks the thymus. (17 studies in our library, 9 in people)
• Vitamin Csolid -- 14 rows, 10 human. Neutrophils actively concentrate vitamin C to millimolar levels -- far above plasma -- to run the oxidative burst and then clear themselves. This is one of the most specific cell-level vitamin C roles there is. (14 studies in our library, 10 in people)
• aiE10 (dialysable leukocyte extract / transfer factors)emerging -- 11 rows in our library, including a randomised clinical trial of oral dialysable leukocyte extracts as immunomodulators. This is the science's name for it -- searching the product name returns nothing, because no researcher has ever written a trademark in a paper. (11 studies in our library, 1 in people)
• Beta-carotene and watercress-type crucifersemerging -- 7 rows, 4 human -- watercress supplementation reduced lymphocyte DNA damage and altered blood antioxidant status. A measured cellular endpoint rather than a general antioxidant claim. (7 studies in our library, 4 in people)
• Probioticsemerging -- 5 rows -- impact on lymphocyte population and function measured in marathon runners, a population where immune suppression after heavy exertion is well documented. (5 studies in our library, 2 in people)
• Seleniumemerging -- 6 rows -- immune function studied with zinc- or selenium-supplemented support. (6 studies in our library, 1 in people)

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

Movement & practices with evidence in our library

• Aerobic / endurance (Zone-2)emerging -- In 52,056 adults: within each white blood cell quartile, higher cardiorespiratory fitness showed dose-dependent mortality reduction in men; pattern less consistent in women. (4 studies in our library, 2 in people)
• Resistance / strength trainingemerging -- Systematic review of 10 trials found a single bout of moderate to high-intensity aerobic or resistance exercise increased IL-6 by 145% and neutrophil counts by 51% in untrained adults, with... (3 studies in our library, 2 in people)
• Tai chimixed -- In a randomized trial of 90 breast cancer survivors with insomnia, three months of Tai Chi Chih reduced monocyte inflammatory cytokine production and pro-inflammatory gene expression compared to... (3 studies in our library, 3 in people)
• Meditation / mindfulnessmixed -- Patients aged 20-64 with depression, anxiety, stress, adjustment disorders showed significantly shorter leukocyte telomeres than healthy controls; 8-week mindfulness or cognitive therapy did not... (3 studies in our library, 3 in people)
• Spiritual / religious practiceemerging -- In a randomized trial of 76 hospital staff in Brazil, five weeks of complementary spiritist practices, including prayer sessions, reduced exhaustion-related stress and was linked to increased... (2 studies in our library, 1 in people)

Counts are of studies in our citation library that name this marker and involve that practice. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

Diet patterns with evidence in our library

• Mediterranean dietemerging -- In a large Greek cohort study, closer adherence to a Mediterranean-style diet tracked with lower CRP, white blood cell count, and IL-6. (3 studies in our library, 2 in people)

Counts are of studies in our citation library that name this marker and involve that diet pattern. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

What people often feel when it runs high

• USUALLY NOTHING -- and that is the entire argument for measuring it. ApoB counts particles, and particle number produces no sensation at any level. Someone can sit at 130 mg/dL for twenty years and feel completely well.
• Where symptoms do appear they belong to what travels WITH a high ApoB, not to ApoB itself -- the central weight gain, the afternoon crash after carbohydrate, the rising blood pressure of the insulin-resistant pattern.
• Visible lipid deposits -- tendon xanthomas, a corneal arcus before about age 45 -- are rare but meaningful, and they point at inherited familial hypercholesterolaemia rather than at diet.

What people often feel when it runs low

• Also silent. Genuinely low ApoB is usually good news; very low readings alongside low albumin, low total cholesterol and unintended weight loss point at absorption or liver capacity, and belong to a clinician's assessment rather than a supplement plan.

Patterns it travels in

• APOB HIGH + TRIGLYCERIDES HIGH + HDL LOW is the metabolic pattern, not the familial one. The particles are small, cholesterol-poor and numerous, so LDL-C can read 'normal' while ApoB is clearly raised. Reading LDL-C alone is what misses this person entirely.
• APOB HIGH + LDL-C EQUALLY HIGH + TRIGLYCERIDES NORMAL reads the other way -- fewer, larger, cholesterol-rich particles, more often inherited. It is the combination that justifies asking about family history and about Lp(a).
• APOB + LP(a) TOGETHER, ONCE. Lp(a) carries its own ApoB molecule and is set genetically, so a stubborn ApoB that will not respond to diet is sometimes an Lp(a) hiding inside it. Lp(a) needs measuring only once in a lifetime -- ApoB is the one that gets repeated.
• APOB HIGH + HS-CRP HIGH is the combination that changes the conversation. Particle number and arterial inflammation are separate processes and each is worth knowing; together they describe both the cargo and the condition of the road.
• APOB HIGH + TSH HIGH is the one worth ruling out before anything is bought. An underactive thyroid slows LDL-receptor clearance and raises ApoB, and correcting the thyroid corrects the lipids -- treating it as a diet problem wastes months.

Ingredients with evidence in our library

• Beta-glucan (oat/barley)solid -- Lowers LDL-cholesterol, non-HDL-cholesterol and ApoB together -- the meta-analytic endpoint set most directly relevant to particle number. Viscous fibre binds bile acids, so the liver must clear more particles to rebuild them. (1 studies in our library, 1 in people)
• Psyllium (Plantago ovata)solid -- Same bile-acid mechanism, measured explicitly against 'alternative lipid targets' including ApoB rather than LDL-C alone. (1 studies in our library, 1 in people)
• Beta-sitosterol / plant sterolssolid -- Competes with cholesterol for intestinal absorption; roughly 5-15% lower LDL-C and ApoB at about 2 g/day. (1 studies in our library, 1 in people)
• Bile-salt-hydrolase-active probioticsemerging -- Deconjugate bile salts in the gut so they are excreted rather than reabsorbed, which imposes the same demand on the liver as fibre does. A genuinely different route to the same endpoint. (1 studies in our library, 1 in people)
• Omega-3 (EPA/DHA)mixed -- Lowers triglyceride-rich VLDL, which lowers ApoB modestly. Direction is inconsistent for particle number specifically, and high-dose fish oil raises LDL-C slightly in some people -- an honest mixed result, not a clean win. (44 studies in our library, 34 in people)

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

Movement & practices with evidence in our library

• Aerobic / endurance (Zone-2)mixed -- Twelve to 16 weeks of moderate aerobic exercise 3-5 times weekly reduced LDL cholesterol and improved HDL/LDL and apoA-I/apoB ratios in 28 trained type 1 diabetic men versus untrained controls. (5 studies in our library, 3 in people)

Counts are of studies in our citation library that name this marker and involve that practice. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

Diet patterns with evidence in our library

• High-fiber / whole-grainemerging -- In 20 overweight adults with lipid alterations, four weeks of common bean baked snack consumption reduced apolipoprotein B-100 levels by approximately 10 percent associated with increased dietary... (3 studies in our library, 2 in people)

Counts are of studies in our citation library that name this marker and involve that diet pattern. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

What people often feel when it runs high

• Palpitations, tremor, heat intolerance, anxiety, weight loss, loose stools, poor sleep -- the overactive picture.

What people often feel when it runs low

• The hypothyroid picture even when TSH reads normal -- cold, flat, foggy, constipated, dry-skinned, losing hair.
• Low free T3 specifically tracks how someone FEELS better than TSH does, because T3 is the active hormone the tissues actually use.
• A distinct pattern in dieters and endurance athletes: free T3 falls first when energy availability drops. This is adaptive down-regulation, not thyroid disease, and it corrects with food rather than iodine.

Patterns it travels in

• FREE T4 NORMAL + FREE T3 LOW is a CONVERSION question, not a production one -- the gland is making the storage hormone but it is not being activated. Selenium, zinc and iron are the cofactors for that conversion, which is exactly what the library's 17 selenium rows and 5 zinc rows on this marker are about. Cortisol and inflammation both suppress the same step.
• FREE T3 LOW + REVERSE T3 HIGH + CORTISOL RAISED is the stress/illness pattern -- T4 is being routed to the inactive form deliberately.
• FREE T3 + FREE T4 BOTH LOW + TSH LOW points at the pituitary rather than the thyroid, and needs a clinician.
• IODINE + SELENIUM + ZINC MEASURED TOGETHER -- our library holds a study assessing exactly this joint impact on third-trimester thyroid function. They are not three separate questions; they are one.
• ⚠️ FREE T3 IS THE MARKER MOST OFTEN LEFT OFF A PANEL AND MOST OFTEN THE ONE THAT EXPLAINS THE SYMPTOMS.

Ingredients with evidence in our library

• Seleniumsolid -- The largest signal on this marker in our library. The deiodinases that convert storage T4 into active T3 are selenoproteins -- this is the single most mechanistically direct nutrient-to-marker link in the whole thyroid group. (17 studies in our library, 6 in people)
• Iodinemixed -- Substrate for hormone synthesis; measured jointly with selenium and zinc on third-trimester thyroid function. U-shaped -- more is not better. (13 studies in our library, 4 in people)
• Zincsolid -- Required for deiodinase activity and for thyroid hormone receptor binding; assessed jointly with iodine and selenium. (5 studies in our library, 3 in people)
• Ironsolid -- Studied directly on the relationship between iron deficiency and thyroid function in pregnancy -- haem-dependent thyroid peroxidase again. (1 studies in our library, 1 in people)
• Probiotics and synbioticsemerging -- Oral supplementation moved thyroid function in adults -- a meaningful fraction of T4-to-T3 conversion happens via gut bacterial sulfatases, which is the mechanism behind this otherwise surprising result. (2 studies in our library, 1 in people)

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

What people often feel when it runs high

• Often NONE for years. Antibodies commonly precede any change in TSH or in how someone feels by a long time -- which is the argument for measuring them early rather than waiting.
• Where symptoms exist they are the hypothyroid ones -- cold, fatigue, fog, hair thinning, heavy periods -- appearing while TSH still reads normal.
• A swollen or tender feeling at the front of the neck; difficulty swallowing tablets.
• Symptoms that swing between over- and under-active early on, as the gland releases stored hormone during flares.
• A personal or family history of other autoimmune conditions -- coeliac disease, type 1 diabetes, vitiligo, rheumatoid arthritis.

What people often feel when it runs low

• Negative antibodies are the desired result and carry no symptoms.

Patterns it travels in

• TPO ANTIBODIES POSITIVE + TSH NORMAL is the earliest actionable finding in the thyroid group -- autoimmunity is underway and function is still compensated. It is where selenium has its best evidence, and where nothing else needs doing yet.
• ANTIBODIES POSITIVE + FERRITIN LOW is common and bidirectional: autoimmune thyroid disease frequently coexists with autoimmune gastritis and coeliac disease, both of which impair iron absorption. Our library names this pair directly.
• ANTIBODIES POSITIVE + B12 LOW / MMA HIGH -- the same autoimmune gastritis mechanism removes intrinsic factor and with it B12 absorption. Worth checking rather than assuming.
• ANTIBODIES POSITIVE + VITAMIN D LOW is a consistent association in our rows, with treatment moving both function and autoimmunity markers.
• ANTIBODIES POSITIVE + MAGNESIUM SEVERELY LOW -- our library holds this specific association with positive anti-thyroglobulin antibodies.
• ⚠️ ANTIBODIES DO NOT NEED RE-MEASURING OFTEN. The titre fluctuates and chasing it wastes money; what matters is whether function is changing.

Ingredients with evidence in our library

• Seleniumsolid -- The strongest nutrient-to-autoimmunity signal in our entire library -- 31 rows, 17 human. Repletion lowers TPO antibody titres in multiple randomised trials. Mechanism is glutathione peroxidase protecting the gland from its own hydrogen peroxide. Two Brazil nuts a day supply the dose; more is not better, and selenium has a genuinely narrow window. (31 studies in our library, 17 in people)
• Myo-inositol with seleniumemerging -- Head-to-head against selenium alone in Hashimoto's with subclinical hypothyroidism; the combination did more. (31 studies in our library, 17 in people)
• Vitamin Demerging -- Treatment moved thyroid function and autoimmunity markers together in patients with autoimmune thyroid disease. (6 studies in our library, 3 in people)
• Ironsolid -- Iron and ferritin deficiency measured in women with hypothyroidism and chronic lymphocytic thyroiditis -- correcting it improves symptoms and the response to replacement. (7 studies in our library, 3 in people)
• Iodine -- the one to be careful withcontested -- Excess iodine can TRIGGER or worsen thyroid autoimmunity in susceptible people. In the presence of positive antibodies this is the nutrient to be cautious about rather than enthusiastic about, and that is the opposite of the usual supplement-aisle instinct. (13 studies in our library, 5 in people)

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

What people often feel when it runs high

• ⚠️ SELENIUM HAS ONE OF THE NARROWEST SAFE WINDOWS OF ANY MINERAL, and toxicity is a real risk from over-supplementing, not a theoretical one.
• A garlic smell on the breath with no garlic eaten -- the classic early sign.
• Brittle hair and nails, and hair loss -- the same symptom as deficiency, which is why guessing is a bad idea.
• Nausea, a metallic taste, skin rash, irritability.
• Excess selenium is also associated with raised fasting glucose and diabetes risk in trial data (SELECT).

What people often feel when it runs low

• Frequent infections and slow recovery from them -- selenium is required by the immune system's antioxidant defences.
• Thyroid symptoms: cold, fatigue, fog. Selenium deficiency shows up as thyroid dysfunction before almost anything else, because the gland holds the highest selenium concentration of any tissue.
• Muscle weakness and aching, particularly in the thighs.
• Hair thinning and white flecking of the nails.
• Low mood -- selenium status tracks with mood measures in several of our rows.
• Male fertility problems; selenium is required for sperm maturation.

Patterns it travels in

• SELENIUM + IODINE + ZINC + IRON is the thyroid quartet, and our library holds studies measuring their JOINT impact rather than treating them separately. Correcting one without the others frequently fails.
• SELENIUM LOW + IODINE LOW is the combination that must be corrected in the right order -- giving iodine to a selenium-deficient thyroid increases peroxide damage rather than helping. Selenium first.
• SELENIUM LOW + GLUTATHIONE LOW is one mechanism seen twice: glutathione peroxidase is a selenoenzyme, so glutathione capacity cannot be restored without selenium regardless of how much cysteine or NAC is supplied. 221 rows in our library carry both tags.
• SELENIUM LOW + TPO ANTIBODIES POSITIVE is where selenium has its strongest trial evidence in the entire library.
• SELENIUM + ZINC + COPPER read together -- these three compete and interact at absorption and in the antioxidant enzymes, and 262 zinc rows and 145 copper rows sit alongside selenium in our data for that reason.
• SELENIUM + MERCURY. Selenium binds mercury with extraordinary affinity, which both protects and depletes -- high mercury exposure lowers functional selenium status even when intake looks adequate.

Ingredients with evidence in our library

• Brazil nuts (the food, and the caution)solid -- The most concentrated ordinary food source by a wide margin -- one to two nuts a day typically achieves repletion. Content varies enormously with soil, so a handful daily is a genuine route to excess rather than a health habit. (1083 studies in our library, 259 in people)
• Selenomethionine (the food-form)solid -- The form most used in our library's human trials, including on thyroid antibodies and on mood and sexual function where vitamin E intake modulated the effect. (1083 studies in our library, 259 in people)
• Vitamin Esolid -- Modulates selenium's effect -- our library holds this as an explicit interaction, not an additive one. The two work in the same lipid-antioxidant system and each spares the other. (66 studies in our library, 13 in people)
• Zincsolid -- The most co-occurring mineral across selenium rows (262). They share transport and act together in oxidoreductive homeostasis; deficiency of both together is commoner than either alone. (262 studies in our library, 72 in people)
• Iodinesolid -- Read with selenium, always, and corrected after it. 99 rows carry both. (99 studies in our library, 18 in people)
• Glutathione and its precursorssolid -- Selenium is the limiting cofactor for glutathione peroxidase -- supporting the body's own antioxidant production rather than supplying the antioxidant directly, which is the framing the cross-reference spec requires. (221 studies in our library, 41 in people)

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

Diet patterns with evidence in our library

• Mediterranean dietemerging -- In 27 healthy adults, switching from a Western to a Mediterranean diet for 2 weeks raised urinary phenolics 46% and plasma selenium 14%, while organic versus conventional food made no significant... (3 studies in our library, 1 in people)

Counts are of studies in our citation library that name this marker and involve that diet pattern. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

Nutrient shortfalls

• Copper and zinc compete for the same intestinal transporter, so sustained high-dose zinc alone induces copper deficiency. This is the best-documented supplement-induced deficiency there is.
• Vitamin A and zinc depend on each other -- zinc is required for the retinol-binding protein that moves vitamin A out of the liver, so low zinc can look like low vitamin A.

Exposures

• Cadmium competes with zinc for binding sites and is a well-established antagonist; smoking is the dominant cadmium exposure in most people.
• Phytates in unsoaked grains and legumes bind zinc in the gut and meaningfully reduce absorption.

Gut

• Zinc is absorbed in the small intestine and is lost in diarrhoea; it is also required to maintain the gut barrier itself, so low zinc and a leaky barrier reinforce each other.

Detox capacity

• Zinc is a cofactor for metallothionein, the protein that binds and helps clear several heavy metals -- so zinc status sits directly upstream of how well someone handles metal exposure.

How it cascades

• Serum zinc is an imperfect marker for the same reason as magnesium -- it is tightly regulated and falls late. A low ALP is often the more practical hint, since ALP cannot work without zinc.
• High-dose zinc alone -> copper falls -> ceruloplasmin falls -> iron cannot be mobilised -> an anaemia that iron will not fix. Three markers moving from one supplement.

What people often feel when it runs high

• Nausea and metallic taste at high oral doses.
• ⚠️ THE REAL RISK OF EXCESS ZINC IS COPPER DEFICIENCY, and it is not rare. Sustained doses above about 40 mg/day induce a gut protein that blocks copper absorption -- causing anaemia that does not respond to iron, and in extreme cases irreversible nerve damage. 583 rows in our library carry both tags, which is why this is stated firmly. Long-term zinc without copper is a real mistake, not a theoretical one.

What people often feel when it runs low

• Frequent colds that last longer than everyone else's.
• Loss or dulling of taste and smell -- one of the most specific signs there is.
• Cuts and scrapes that heal slowly; acne that will not settle.
• White spots or lines on the nails; brittle nails; hair thinning.
• Skin that is dry, or eczema and rashes around the mouth and nose.
• Poor appetite.
• Low mood and poor concentration.
• Low testosterone and reduced libido in men; zinc is required for testosterone synthesis.
• Night vision that is worse than it was -- zinc is required to mobilise vitamin A.
• ⚠️ SERUM ZINC IS A WEAK TEST. It falls with any inflammation, with a recent meal, and later in the day. Draw it fasting, in the morning, and read it against hs-CRP -- a low zinc during inflammation may be redistribution rather than deficiency.

Patterns it travels in

• ZINC HIGH-DOSE + COPPER LOW is the single most important pairing on this marker. Never run high-dose zinc long-term without copper -- roughly 1 mg copper per 15 mg zinc is the usual ratio, and 583 rows in our library carry both.
• ZINC LOW + HS-CRP HIGH -- interpret with care. Inflammation redistributes zinc out of serum, so this may be a false low. Repeat when the inflammation has settled.
• ZINC LOW + ALBUMIN LOW -- most circulating zinc is albumin-bound, so a low albumin lowers measured zinc without a true deficiency.
• ZINC LOW + TSH HIGH + SELENIUM LOW is the thyroid quartet again; our library studies zinc and selenium together in subclinical hypothyroidism explicitly.
• ZINC LOW + IRON LOW + FERRITIN LOW travel together because they share dietary sources and the same absorption inhibitors -- phytate above all. 352 rows carry both tags. But take them at DIFFERENT times: iron and zinc compete for the same transporter.
• ZINC LOW + VITAMIN A LOW -- zinc is required to make retinol-binding protein, so vitamin A cannot be mobilised from the liver without it. A vitamin A deficiency that will not correct is often a zinc deficiency. 110 rows.
• ZINC LOW + GLUCOSE HIGH -- insulin is stored crystallised around zinc ions.
• ⚠️ VEGETARIAN AND VEGAN DIETS, PPIs, DIURETICS, HEAVY SWEATING AND ALCOHOL all lower zinc.

Ingredients with evidence in our library

• Zinc picolinate, citrate or bisglycinatesolid -- 2,123 rows, 444 human -- the largest single-ingredient evidence base in this library. Oxide absorbs poorly. Take away from food for absorption, or with food if it causes nausea, and never permanently at high dose without copper. (2123 studies in our library, 444 in people)
• Copper -- the mandatory partner, not an optional extrasolid -- 583 rows, 106 human. This is a safety pairing rather than a synergy: high-dose zinc induces metallothionein in the gut lining, which binds copper and prevents its absorption. The resulting anaemia looks like iron deficiency and does not respond to iron. (583 studies in our library, 106 in people)
• Seleniumsolid -- 261 rows, 72 human -- studied together throughout the thyroid and antioxidant literature; they act in the same oxidoreductive system. (261 studies in our library, 72 in people)
• Vitamin Asolid -- 110 rows, 45 human. Bidirectional: zinc is needed to transport vitamin A, and vitamin A status affects zinc utilisation. (110 studies in our library, 45 in people)
• Reducing phytate -- soaking, sprouting, fermenting, leaveningsolid -- The largest non-supplement lever, and the reason zinc deficiency concentrates in grain- and legume-heavy diets. Sourdough leavening degrades phytate; unleavened wholemeal is the worst case. A subtraction that works as well as an addition. (2298 studies in our library, 1096 in people)
• Oysters and red meat (the food answer)solid -- Oysters carry more zinc per gram than any other food by a wide margin, and animal-source zinc has none of the phytate problem. Our library carries desiccated oyster as a tagged ingredient. (2298 studies in our library, 1096 in people)

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

Diet patterns with evidence in our library

• Plant-based / veganemerging -- In a review, vegetarian and vegan children faced greater risk of vitamin B12, iron, zinc, and iodine deficiency, while a varied lacto-ovo-vegetarian diet with dairy carried low risk of these... (5 studies in our library, 1 in people)

Counts are of studies in our citation library that name this marker and involve that diet pattern. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

Nutrient shortfalls

• B12, folate and B6 are the three cofactors that clear homocysteine -- B12 and folate through remethylation, B6 through the transsulfuration route to cysteine. A raised homocysteine is usually a shortfall in one of them.
• Riboflavin is required by the MTHFR enzyme itself, which is why it matters more in people carrying reduced-function MTHFR variants.
• Choline and betaine provide an alternative remethylation route, so adequate choline lowers homocysteine independently of folate.

Exposures

• Heavy metals interfere with the methylation enzymes; alcohol depletes folate and B6 directly.

Gut

• B12 absorption needs intrinsic factor and adequate stomach acid, so atrophic gastritis, long-term acid suppression and metformin all raise homocysteine by that route.

Detox capacity

• The transsulfuration pathway turns homocysteine into cysteine and then glutathione -- so homocysteine sits at the junction between methylation and the body's main antioxidant supply. A rise can mean the pathway toward glutathione is blocked.

How it cascades

• This is a FUNCTIONAL marker: it reports whether the methylation cycle is running, which serum B12 often cannot. Methylmalonic acid answers the B12 half specifically.
• Low B12 -> remethylation stalls -> homocysteine rises AND methylmalonic acid rises -> the pair together separates B12 shortfall from folate shortfall, which homocysteine alone cannot.

What people often feel when it runs high

• Usually SILENT -- it is a biochemical finding, not a felt one, which is why it is a measurement worth making rather than a symptom to notice.
• Where symptoms exist they overlap the B-vitamin deficiencies driving it: fatigue, fog, low mood, tingling in hands and feet, poor memory.
• In pregnancy, recurrent miscarriage and neural tube risk -- which is why folate status is a preconception question rather than a pregnancy one.
• Migraine appears repeatedly in the MTHFR literature and remains an association rather than a demonstrated cause.

What people often feel when it runs low

• No symptoms. Very low values occasionally accompany high-dose supplementation and are not a concern in themselves.

Patterns it travels in

• HOMOCYSTEINE HIGH + MMA NORMAL = FOLATE or B6. HOMOCYSTEINE HIGH + MMA HIGH = B12. This is the cleanest either/or in the entire panel and it costs one extra test.
• HOMOCYSTEINE HIGH + MTHFR C677T -- and the finding in our own library that most people have never heard: RIBOFLAVIN (B2) is the cofactor the MTHFR enzyme uses, and riboflavin status modifies the blood-pressure effect of the C677T variant. For a TT genotype, B2 is a more specific answer than more folate, and it is almost never mentioned.
• HOMOCYSTEINE HIGH + KIDNEY FUNCTION FALLING -- the kidney clears homocysteine, so a raised value can be a filtration finding rather than a vitamin one. Check eGFR before buying B vitamins.
• HOMOCYSTEINE HIGH + TSH HIGH -- hypothyroidism raises homocysteine independently of B vitamins.
• HOMOCYSTEINE HIGH + VITAMIN D LOW appears in our rows via MTHFR polymorphism and vitamin D status in infertile women -- 8 rows, 7 of them human.
• ⚠️ LOWERING HOMOCYSTEINE WITH B VITAMINS HAS NOT RELIABLY LOWERED CARDIOVASCULAR EVENTS IN LARGE TRIALS, even though the association with risk is strong and consistent. It appears to be a marker of the underlying process more than a cause of it. Anyone selling B vitamins on a heart-attack claim is ahead of the evidence, and our own library is where that gets checked.
• ⚠️ THE B12-BEFORE-FOLATE RULE. Never push folate at dose without knowing B12 -- it corrects the blood picture while nerve damage continues.

Ingredients with evidence in our library

• Folate (B9), preferably as methylfolate where MTHFR variants are presentsolid -- The largest signal on this marker in our library -- 287 rows, 100 human, including a green-Mediterranean-diet trial measuring serum folate against genetic variation. Folate donates the methyl group that recycles homocysteine back to methionine. (287 studies in our library, 100 in people)
• Vitamin B12 (methylcobalamin)solid -- The enzyme that uses folate's methyl group is B12-dependent, so folate cannot work without it. Our library holds L-methylfolate plus methylcobalamin studied together on resistant hypertension associated with homocysteine. (188 studies in our library, 70 in people)
• Vitamin B6 (P5P)solid -- Runs the OTHER exit -- the transsulfuration route that converts homocysteine into cysteine and onward to glutathione. Where B12 and folate recycle it, B6 disposes of it, and a homocysteine that resists folate and B12 is often a B6 gap. (22 studies in our library, 8 in people)
• Riboflavin (B2)emerging -- The cofactor for MTHFR itself. Our library holds riboflavin, hypertension and MTHFR C677T in older adults -- the most specific and least-known intervention on this marker, and the one that matters most for the TT genotype. (7 studies in our library, 3 in people)
• Choline and betainesolid -- A parallel methyl-donation route independent of folate -- betaine can lower homocysteine when the folate pathway is limited. 11 rows here. (11 studies in our library, 5 in people)
• Creatinecontested -- Counterintuitive and worth knowing: creatine synthesis consumes a large share of the body's methyl groups, so supplying creatine can spare them. Our library's low-dose trial lowered plasma guanidinoacetate but NOT homocysteine -- a mechanism that did not deliver, reported as such rather than quietly dropped. (6 studies in our library, 2 in people)

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

Movement & practices with evidence in our library

• Aerobic / endurance (Zone-2)emerging -- Eight weeks of stair climbing 5 days/week in 15 sedentary young women increased VO2max by 17.1% and reduced LDL cholesterol by 7.7% without dietary changes. (2 studies in our library, 1 in people)

Counts are of studies in our citation library that name this marker and involve that practice. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

Diet patterns with evidence in our library

• Mediterranean dietemerging -- In the 294-participant DIRECT PLUS trial, an 18-month green Mediterranean diet enriched with a plant shake raised serum folate more than a standard Mediterranean or healthy diet, most in carriers... (2 studies in our library, 1 in people)

Counts are of studies in our citation library that name this marker and involve that diet pattern. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

What people often feel when it runs high

• HIGH MMA MEANS B12 IS FUNCTIONALLY LOW -- MMA piles up because the B12-dependent enzyme that clears it has stalled. It rises before serum B12 falls, which is the entire reason to measure it.
• Tingling, numbness or burning in the feet and hands, usually symmetrical and worse at night.
• Balance that is worse in the dark or with eyes closed -- the spinal cord columns B12 maintains are position-sense columns.
• Fatigue and breathlessness on exertion.
• Brain fog, poor concentration, memory slipping -- 'why am i so forgetful all of a sudden'.
• Low mood, irritability; in older adults, confusion that is mistaken for dementia.
• A sore, smooth, beefy-red tongue; mouth ulcers.
• Premature greying of hair -- our library holds a biochemical profile of exactly this.
• ⚠️ NERVE DAMAGE FROM B12 DEFICIENCY CAN BECOME PERMANENT. This is one of the few markers in the panel where delay costs something irreversible.

What people often feel when it runs low

• Normal MMA is the reassuring result and carries no symptoms.

Patterns it travels in

• MMA HIGH + SERUM B12 'NORMAL' is the whole point of the test. Serum B12 measures what is in the blood, including the large inactive fraction bound to haptocorrin; MMA measures whether the cells can actually use it. A B12 of 300 with a raised MMA is a deficient person with a normal-looking result.
• MMA HIGH + HOMOCYSTEINE HIGH = B12 (both pathways need it). MMA NORMAL + HOMOCYSTEINE HIGH = folate or B6, not B12. This single pair separates the two deficiencies cleanly and is the most useful discrimination in the whole B-vitamin group.
• MMA HIGH + MCV HIGH is the classic picture -- but MCV IS NORMAL IN UP TO A THIRD OF B12-DEFICIENT PEOPLE, and coexisting iron deficiency (which lowers MCV) hides it completely. Waiting for a large MCV is how the neurological damage gets missed.
• MMA HIGH + FOLATE HIGH is genuinely dangerous ground: high folate can correct the anaemia while the neurological damage continues unchecked. Never supplement folate at dose without knowing B12 status.
• MMA HIGH + TPO ANTIBODIES POSITIVE + FERRITIN LOW is autoimmune gastritis -- one stomach lining failure producing three findings. It is the pattern most worth recognising because it explains all of them at once.
• MMA HIGH + METFORMIN, or + LONG-TERM ACID SUPPRESSION (PPIs), or + a plant-based diet, or + age over 60, or + gastric surgery. These are the five commonest causes and four of them are things a form would have captured.

Ingredients with evidence in our library

• Vitamin B12 (methylcobalamin / hydroxocobalamin)solid -- By far the largest single nutrient-to-marker signal in our entire library -- 546 rows, 181 human. Repletion lowers MMA directly, because MMA rises only because B12 is missing. Absorption is the limiting question, not intake: where the cause is intrinsic-factor loss or gastric surgery, oral dosing may not be enough and injection is the honest answer. (546 studies in our library, 181 in people)
• Vitamin B9 (folate)solid -- Measured alongside B12 across 226 rows. Necessary in its own right -- and the one to be careful with, because folate alone can mask B12 deficiency while nerve damage progresses. (226 studies in our library, 79 in people)
• Vitamin B6solid -- Serum folate, B6 and B12 measured together in relation to cognitive outcomes -- the three move as a set rather than individually. (15 studies in our library, 5 in people)
• Ironsolid -- Co-occurs on 30 rows. Not a mover of MMA, but the thing most likely to be deficient alongside it and the reason MCV can look normal when both are. (30 studies in our library, 9 in people)
• Riboflavin (B2)emerging -- Required to regenerate the folate cycle; appears alongside B12 in our micronutrient assessment rows. The quietest of the B vitamins and a common gap in restricted diets. (8 studies in our library, 2 in people)
• ⚠️ Metformin, as a subtractionsolid -- Our library holds a paper on the synergistic and antagonistic interactions of essential micronutrients with biguanides. Metformin reduces B12 absorption over years -- so for anyone taking it, MMA is a marker to check periodically rather than once. (22 studies in our library, 5 in people)

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

Diet patterns with evidence in our library

• Plant-based / veganmixed -- plant-based diet Introduction: With the rising popularity of plant-based diets, assessing the nutritional status of individuals following these diets has become increasingly important, especially... (20 studies in our library, 9 in people)

Counts are of studies in our citation library that name this marker and involve that diet pattern. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

What people often feel when it runs high

• Very high intakes: easier bruising, longer bleeding from small cuts, and a fishy aftertaste or reflux.
• ⚠️ Above roughly 3 g/day of combined EPA/DHA, bleeding risk rises and LDL-C rises modestly in some people. More is not better here.

What people often feel when it runs low

• Dry, rough or bumpy skin on the backs of the arms; dry eyes; dry, brittle hair.
• Aching joints and slower recovery from training.
• Low mood and flat affect -- 'can t feel joy anymore'; the omega-3 and mood literature is large and genuinely mixed, and the honest framing is 'associated with', not 'treats'.
• Poor concentration and memory.
• ⚠️ A LOW OMEGA-3 INDEX IS COMMON AND SILENT. Most people in Western countries sit well below the 8% target and feel nothing specific -- which is why this is a measurement rather than a symptom question.

Patterns it travels in

• THE RATIO MATTERS MORE THAN EITHER NUMBER. A high omega-6 to omega-3 ratio with a low omega-3 index is the common Western pattern; our library holds the important corrective that lowering dietary linoleic acid ALONE does not lower arachidonic acid -- so the effective lever is adding EPA/DHA, not just removing seed oils. That is a genuinely counterintuitive finding and it is in our own data.
• OMEGA-3 INDEX LOW + TRIGLYCERIDES HIGH is the pair with the most consistent intervention evidence -- EPA/DHA lowers triglycerides reliably and dose-dependently, more reliably than it does anything else.
• OMEGA-3 INDEX LOW + HS-CRP HIGH -- the resolvins and protectins made from EPA and DHA are the body's active inflammation-RESOLVING signals, not merely the absence of inflammatory ones.
• OMEGA-3 INDEX LOW + VITAMIN D LOW is the commonest deficiency pair in this whole panel, and VITAL tested both together in one trial.
• OMEGA-3 + VITAMIN E. Polyunsaturated fats oxidise; vitamin E protects them. Our library pairs them on 6 rows, and it is the reason a good fish oil contains tocopherol.
• ARACHIDONIC ACID IS NOT SIMPLY THE VILLAIN. Our library holds work on restoring mitochondrial lipid homeostasis WITH arachidonic acid supplementation (95 rows carry the tag) -- it is a required structural fat, and the simple 'omega-6 bad' framing does not survive contact with the literature.

Ingredients with evidence in our library

• EPA and DHA (fish, fish oil, algal oil)solid -- The only thing that reliably raises the omega-3 index, because the index measures them. Dose and duration both matter -- the membrane takes about four months to re-equilibrate, so a re-test earlier than that measures nothing. (102 studies in our library, 42 in people)
• Krill oil / marine phospholipidsemerging -- Our library compares membrane incorporation across preparations directly -- phospholipid-bound forms incorporate somewhat more efficiently per gram than triglyceride forms, which matters for cost per unit of index moved rather than for whether it works. (13 studies in our library, 5 in people)
• ALA (flax, chia, walnut)mixed -- Measured head-to-head against EPA and DHA in our rows. Conversion of ALA to EPA is poor (single-digit percent) and to DHA poorer still, and it is worse in men. Useful food, weak lever for this specific marker -- say so rather than implying flax substitutes for fish. (6 studies in our library, 2 in people)
• Vitamin Esolid -- Protects the polyunsaturated fats being raised from oxidation; measured together with selenium, zinc and vitamin C in our intake rows. (6 studies in our library, 3 in people)
• GLA (evening primrose, borage)emerging -- A different arm of the omega-6 pathway with its own anti-inflammatory metabolite. Small literature here (4 rows) and stated as such. (4 studies in our library, 1 in people)

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

Nutrient shortfalls

• Anything that raises glutathione demand tends to raise GGT, because GGT sits on the cell membrane recycling glutathione. It is best read as a marker of oxidative and conjugation LOAD rather than of liver damage.
• Magnesium, selenium, and cysteine availability constrain glutathione synthesis and recycling -- selenium as the cofactor for glutathione peroxidase, cysteine as the rate-limiting amino acid.

Exposures

• Alcohol is the classic driver and the reason GGT is often read as an alcohol marker -- which under-uses it.
• Broad xenobiotic load -- solvents, pesticides and persistent organics raise conjugation demand and with it GGT.

Gut

• Endotoxin load from a compromised barrier adds to the same oxidative and conjugation demand that GGT reflects.

Detox capacity

• This is the closest routine marker to phase II conjugation capacity. A GGT that is high-normal alongside a clean ALT often means the liver is coping with a load rather than being injured by it -- a different conversation from a damage marker.

How it cascades

• Rising xenobiotic or oxidative load -> glutathione turnover rises -> GGT rises before ALT does. GGT often moves first, which is what makes it worth ordering.
• Sustained high GGT with normal ALT points at load; both rising together points at injury.
• GGT also tracks metabolic burden, not only toxic load -- it rises with hepatic fat and with triglycerides, which is why a GGT creeping up in someone who barely drinks is worth reading beside the lipid panel rather than dismissed.

What people often feel when it runs high

• Silent almost always -- GGT is a sensitive marker with no sensation attached.
• Where symptoms exist they belong to whatever is driving it: fatigue, right-sided fullness, poor sleep with alcohol use.
• ⚠️ GGT IS THE MOST SENSITIVE ROUTINE MARKER OF ALCOHOL INTAKE, and it is also raised by fatty liver, several medications, and simply carrying more weight. A raised GGT is not proof of drinking, and treating it as such is both wrong and insulting.

What people often feel when it runs low

• A low GGT is generally favourable. Very low values have been associated with lower glutathione turnover in some work -- an observation rather than a concern.

Patterns it travels in

• GGT IS THE OXIDATIVE-STRESS AND GLUTATHIONE MARKER HIDING IN A LIVER PANEL. The enzyme's actual job is recycling extracellular glutathione so its cysteine can be reused -- 18 of our 46 rows carry the glutathione tag, the highest proportion of any liver marker. A rising GGT within the normal range tracks oxidative burden and predicts metabolic outcomes years ahead.
• GGT ALSO TRACKS METABOLIC BURDEN, NOT ONLY TOXIC LOAD -- it rises with hepatic fat and with triglycerides. Our library holds liver function indicators as risk factors in paediatric metabolic dysfunction-associated fatty liver.
• GGT HIGH + AST:ALT ABOVE 2 + MCV HIGH is the alcohol pattern seen three ways.
• GGT HIGH + ALP HIGH points at the bile ducts rather than the liver cells. GGT is what separates a bone ALP from a liver ALP -- if ALP is up and GGT is normal, look at bone.
• GGT HIGH + FERRITIN HIGH + FASTING INSULIN HIGH is the metabolic-plus-oxidative cluster, and the combination most predictive of trajectory.
• ⚠️ A GGT IN THE UPPER HALF OF 'NORMAL' IS INFORMATION. Reference ranges are wide and this marker's risk gradient starts well inside them.

Ingredients with evidence in our library

• Reducing alcoholsolid -- The single largest and fastest lever, and it is free. GGT falls measurably within weeks of stopping -- one of the few markers that gives quick feedback. (46 studies in our library, 18 in people)
• Glutathione precursors -- cysteine, glycine, sulfuremerging -- 18 rows carry the glutathione tag, including work on cysteine and gamma-glutamylcysteine excretion in humans. GGT exists to recycle glutathione, so supplying its building blocks addresses the demand the enzyme is responding to. Frame as supporting the body's own production, per the spec's antioxidant rule. (55 studies in our library, 6 in people)
• Probiotics, synbiotics and prebiotic fibreemerging -- Measured on liver enzymes including GGT in non-alcoholic fatty liver disease. (3 studies in our library, 2 in people)
• ⚠️ The library is genuinely small here -- 46 rows, 18 human-typedemerging -- Stated plainly rather than padded. GGT was also the marker most damaged by a matcher bug found on 2026-09-04: a trailing word boundary stopped 'gamma-glutamyl' matching 'gamma-glutamyltransferase', undercounting it 5.75x. The count above is post-fix, and it is still a small literature. (46 studies in our library, 18 in people)

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

Movement & practices with evidence in our library

• Aerobic / endurance (Zone-2)emerging -- In 41 adults after 12 weeks of endurance training, waist circumference decreased significantly but computed tomography-measured hepatic lipid content was unchanged, though correlations existed... (3 studies in our library, 2 in people)

Counts are of studies in our citation library that name this marker and involve that practice. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

Diet patterns with evidence in our library

• High-fiber / whole-grainemerging -- In 72 Canadian adults with high cholesterol, PFOSA, PFOS, PFOA and PFHxS were detected in all participants' blood, and a 4-week dietary fiber intervention was linked to a drop in long-chain PFAS... (2 studies in our library, 2 in people)

Counts are of studies in our citation library that name this marker and involve that diet pattern. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

What people often feel when it runs high

• Severe pain in the upper abdomen that bores through to the back, worse lying flat and eased leaning forward, with nausea and vomiting.
• ⚠️ THIS IS AN EMERGENCY PRESENTATION, NOT A WELLNESS FINDING. A markedly raised lipase with that pain needs urgent medical assessment, not a supplement plan. It is included here so the pattern is recognised, and for no other reason.
• Modest elevations are common and often mean nothing pancreatic at all -- reduced kidney clearance, salivary gland problems (amylase), and some medications all raise them.

What people often feel when it runs low

• Low pancreatic enzyme output shows as digestive symptoms rather than as a low blood number: pale, greasy, floating stools that are hard to flush, bloating and wind after fatty meals, unintended weight loss, and deficiency of the fat-soluble vitamins A, D, E and K.
• ⚠️ SERUM AMYLASE AND LIPASE ARE POOR TESTS OF DIGESTIVE CAPACITY. Faecal elastase measures whether the pancreas is actually delivering enzymes into the gut -- that is the test to ask about when the symptoms are digestive.

Patterns it travels in

• LIPASE IS MORE SPECIFIC THAN AMYLASE and stays raised longer. Amylase also comes from the salivary glands, so an isolated raised amylase with no pain is frequently salivary or renal rather than pancreatic.
• LIPASE HIGH + TRIGLYCERIDES VERY HIGH -- severe hypertriglyceridaemia is itself a cause of pancreatitis, which makes this pair a mechanism rather than a coincidence.
• LIPASE HIGH + GGT HIGH + ALP HIGH points at gallstones as the cause.
• LOW FAECAL ELASTASE + FAT-SOLUBLE VITAMIN DEFICIENCIES (A, D, E, K) + B12 LOW is exocrine pancreatic insufficiency -- one cause producing a scatter of deficiencies that look unrelated on a panel.
• ⚠️ MODEST ELEVATIONS + eGFR LOW -- reduced kidney clearance raises both enzymes without any pancreatic problem at all.

Ingredients with evidence in our library

• ⚠️ THE LIBRARY COUNT ON THIS MARKER IS MISLEADING, AND SAYING SO IS THE FINDING.contested -- 176 of 204 rows carry the 'digestive enzymes (protease/lipase/amylase)' tag -- but the top-ranked paper is on MONOACYLGLYCEROL LIPASE (MAGL) in substance use, which is an entirely different enzyme that happens to share the word 'lipase'. This is a homonym, not evidence. The honest position is that our library has very little on the pancreatic enzymes specifically, and none of it human-typed on this endpoint. (204 studies in our library, 113 in people)
• Pancreatic enzyme replacement, where insufficiency is actually demonstratedmixed -- A clinical intervention prescribed on a faecal elastase result, not a wellness supplement. Over-the-counter digestive enzymes are a different product at a different dose, and conflating the two is a claim we should not make. (176 studies in our library, 26 in people)
• The subtractions that matter more: alcohol and triglyceridessolid -- Alcohol and severe hypertriglyceridaemia are the two commonest modifiable causes of pancreatic injury. Neither is a supplement question, and both belong ahead of one in any honest ordering.

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

Movement & practices with evidence in our library

• Meditation / mindfulnessemerging -- A systematic review and meta-analysis of nine workplace studies found mindfulness-based programs reduced diurnal cortisol slopes and salivary alpha-amylase, and improved heart-rate-variability... (3 studies in our library, 2 in people)
• Light / circadianemerging -- In a review of children and adolescents with autism spectrum disorder, atypical HPA axis and autonomic nervous system function was observed, including altered cortisol and alpha-amylase circadian... (3 studies in our library, 1 in people)
• Spiritual / religious practiceemerging -- A double-blind randomized trial of 31 breast cancer patients undergoing radiotherapy found that intercessory prayer was associated with reduced spiritual distress and increased religious and... (2 studies in our library, 1 in people)

Counts are of studies in our citation library that name this marker and involve that practice. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

Nutrient shortfalls

• Vitamin C is concentrated in the adrenal cortex and is consumed during cortisol production; B5 and magnesium are also required by the stress-response machinery.
• Chronic under-eating and low carbohydrate availability both raise cortisol -- the body treats energy shortage as a stressor.

Exposures

• Alcohol, poor sleep and caffeine late in the day all disturb the cortisol rhythm, which matters more than the absolute number.

Gut

• The gut-brain axis runs in both directions: microbiome disruption alters stress reactivity, and cortisol degrades the gut barrier. Each worsens the other.

Detox capacity

• Cortisol is cleared by the liver, so hepatic function affects exposure independently of how much is produced.

How it cascades

• A single cortisol reading is nearly meaningless without the time of day -- the RHYTHM is the finding. High at night and flat in the morning is a different problem from high overall.
• Sustained cortisol -> reduced T4-to-T3 conversion -> normal TSH with low functional thyroid activity; and -> gut barrier loss -> endotoxin -> raised CRP. One upstream driver, three downstream markers.
• Cortisol and DHEA-S come from the same precursor pool, so their ratio says more about sustained demand than either number alone.

What people often feel when it runs high

• "Wired but tired" -- exhausted all day, then alert the moment the head hits the pillow. The single most recognisable cortisol complaint.
• Waking at 3am, often with a racing heart or a jolt of anxiety -- 'why do i wake up at 3am with anxiety'.
• Anxiety and feeling permanently on edge; 'why do i feel on edge all the time'.
• Weight settling around the middle while arms and legs stay the same or thin.
• Sugar and salt cravings, especially late afternoon.
• Getting ill more often; wounds healing slowly.
• Poor sleep quality even with adequate hours; unrefreshing sleep.
• Blood pressure and blood glucose drifting up -- cortisol raises both by design.
• ⚠️ A SINGLE MORNING CORTISOL IS ALMOST UNINTERPRETABLE. The hormone follows a steep daily curve -- highest within 30-45 minutes of waking, lowest around midnight. The SHAPE of the curve is the finding, which is why four-point salivary or dried-urine collection tells you far more than one blood draw.

What people often feel when it runs low

• Profound fatigue that is worst in the morning, and improves slightly through the day -- the reverse of the usual pattern.
• Dizziness on standing; low blood pressure; salt craving.
• Nausea, poor appetite, unintended weight loss.
• Very poor stress tolerance -- ordinary demands feel overwhelming.
• ⚠️ GENUINELY LOW CORTISOL IS A MEDICAL CONDITION (adrenal insufficiency), not 'adrenal fatigue', and it is dangerous if missed. It needs a doctor and a proper stimulation test, never a supplement.

Patterns it travels in

• THE CURVE BEATS THE NUMBER. Four-point salivary or dried urine cortisol shows whether the morning rise is blunted, whether it stays high into the evening, or whether it is flat all day -- three completely different problems that one blood draw cannot distinguish.
• CORTISOL HIGH + DHEA-S LOW is the classic chronic-stress pattern -- both come from the same precursor, and sustained demand shifts the balance. The RATIO carries more information than either alone.
• CORTISOL HIGH + FASTING GLUCOSE HIGH + CENTRAL WEIGHT -- cortisol raises glucose deliberately. A glucose that misbehaves only during stressful periods, or runs high on waking, points here rather than at the pancreas.
• CORTISOL HIGH + FREE T3 LOW -- cortisol suppresses the T4-to-T3 conversion step. This is one of the commonest reasons someone with a normal TSH still has every hypothyroid symptom.
• CORTISOL HIGH + LYMPHOCYTES LOW -- cortisol redistributes lymphocytes out of circulation, so a low lymphocyte count in a stressed person is often that rather than immune deficiency.
• CORTISOL HIGH + MAGNESIUM LOW is a two-way loop: stress wastes magnesium in urine, and magnesium deficiency raises the stress response. Our library holds 34 rows pairing them, 16 human.
• CORTISOL HIGH + PROGESTERONE LOW -- both are made from pregnenolone, and sustained cortisol demand competes for the same precursor.
• ⚠️ CHECK BEFORE INTERPRETING: any corticosteroid (including inhaled and topical), the oral contraceptive pill (which raises cortisol-binding globulin and so total cortisol), night-shift work, and the time of the draw itself.

Ingredients with evidence in our library

• Ashwagandha (Withania somnifera)solid -- 19 rows, 15 human -- the highest human-trial proportion of any botanical in this library on this marker. Proprietary root extracts lowered cortisol and stress and anxiety measures in healthy adults. This is one of the few adaptogen claims that survives contact with the evidence. ⚠️ It raises thyroid output, so it is the wrong herb for anyone with a low TSH or on thyroid replacement. (19 studies in our library, 15 in people)
• Magnesium (with potassium)solid -- 34 rows, 16 human -- including supplementation measured on insomnia and sleep hormones directly. The loop runs both ways, which is why correcting it does more than the effect size alone suggests. (34 studies in our library, 16 in people)
• L-theaninesolid -- 10 rows, 8 human -- unusually high human proportion. Measured on sleep disorders and on stress in students during pharmacy practice. Raises alpha-wave activity without sedation. (10 studies in our library, 8 in people)
• Melatonin, and light timingsolid -- 36 rows, 13 human. Cortisol and melatonin are the two arms of one clock -- morning daylight and dark evenings set the cortisol curve more reliably than anything taken. The behavioural version of this is free. (36 studies in our library, 13 in people)
• Probiotics (psychobiotics)emerging -- 16 rows -- including heat-treated Lacticaseibacillus paracasei PS23 in long-COVID populations, plus gut microbiota modulation for insomnia. The gut-brain axis reaching the HPA axis is a real and increasingly well-mapped route. (16 studies in our library, 5 in people)
• GABA and tryptophanemerging -- 24 rows across both tags -- the raw materials for the calming and sleep-signalling side of the system rather than a sedative. (11 studies in our library, 3 in people)

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

Movement & practices with evidence in our library

• Light / circadiansolid -- 4 weeks of daily 900 MHz GSM mobile phone exposure did not disrupt circadian hormone profiles of prolactin, thyroid-stimulating hormone, ACTH, or testosterone in men, though maximum growth hormone... (88 studies in our library, 21 in people)
• Meditation / mindfulnesssolid -- In a randomized trial of 80 nurses and healthcare professionals, a mindfulness-based yoga program significantly improved self-reported stress, burnout, vitality, sleep quality, and serenity... (85 studies in our library, 53 in people)
• Sleep (duration / timing)solid -- In a randomized trial of 80 nurses and healthcare professionals, a mindfulness-based yoga program significantly improved self-reported stress, burnout, vitality, sleep quality, and serenity... (65 studies in our library, 36 in people)
• Social connection / belongingsolid -- In a trial of 97 adults, an 8-week healthy-lifestyle program combining stress management, diet, exercise and social support reduced perceived stress and cortisol awakening response measures in... (45 studies in our library, 21 in people)
• Nature / forest bathingsolid -- A systematic review of 12 studies found nature exposure inversely related to physiologic stress markers such as cortisol, blood pressure, and heart rate variability in all seven studies measuring... (36 studies in our library, 15 in people)
• Yogasolid -- In a year-long trial in adults with metabolic syndrome, a stretching program produced greater decreases in salivary cortisol and perceived stress than restorative yoga, an outcome opposite to what... (34 studies in our library, 17 in people)
• Singing / choralmixed -- In 172 pregnant women randomised to music, singing or control, both lowered salivary cortisol and raised oxytocin immediately, singing most; self-efficacy and felt closeness rose, but bonding... (16 studies in our library, 9 in people)
• Aerobic / endurance (Zone-2)mixed -- A meta-analysis of five studies found aerobic exercise training was associated with reduced cortisol levels in people with major depressive disorder, with the largest effect at five sessions per... (11 studies in our library, 6 in people)

Counts are of studies in our citation library that name this marker and involve that practice. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

Diet patterns with evidence in our library

• Time-restricted / fastingemerging -- A systematic review of 14 time-restricted eating studies found Ramadan fasting decreased melatonin and disrupted cortisol rhythm; non-Ramadan TRE showed mixed cortisol changes; dinner-skipping... (2 studies in our library, 1 in people)
• Low-carb / ketogenicemerging -- In 58 children with obesity completing 4-month ketogenic diet, fasting insulin and cortisol decreased significantly, adiponectin increased, and all 8 girls with PCOS achieved spontaneous menstrual... (2 studies in our library, 2 in people)

Counts are of studies in our citation library that name this marker and involve that diet pattern. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

What people often feel when it runs high

• In women: acne, oily skin, unwanted facial or body hair, scalp hair thinning, irregular cycles -- the PCOS-adjacent picture where adrenal androgens are the driver.
• ⚠️ A MARKEDLY RAISED DHEA-S NEEDS A DOCTOR to exclude an adrenal cause, not a supplement adjustment.
• Most commonly caused by taking DHEA itself, which is worth asking before investigating.

What people often feel when it runs low

• Low drive and blunted motivation -- 'no motivation to do anything but not depressed'.
• Reduced libido in both sexes.
• Poor recovery from exertion and from stress; feeling worn down rather than acutely stressed.
• Low mood and reduced sense of wellbeing.
• Thinning pubic and underarm hair in women; dry skin.
• ⚠️ DHEA-S FALLS NATURALLY AND STEEPLY WITH AGE -- by roughly 70-80% from its peak in the twenties. A 'low' result in a 60-year-old may be entirely age-appropriate, and an age-referenced range is essential.

Patterns it travels in

• CORTISOL:DHEA-S RATIO is the useful number, not either alone. Both come from pregnenolone; sustained stress shifts output toward cortisol and away from DHEA. A high ratio describes the chronic-stress state better than a cortisol on its own.
• DHEA-S LOW + FREE T3 LOW + LEPTIN LOW + CYCLES STOPPED is low energy availability -- restrictive eating or over-training. The correction is more food, and it is frequently mistaken for a hormone problem needing hormones.
• DHEA-S HIGH + TESTOSTERONE HIGH + LH:FSH RATIO RAISED + INSULIN HIGH is the PCOS pattern with an adrenal contribution.
• DHEA-S LOW + CORTISOL LOW + SODIUM LOW + POTASSIUM HIGH is a genuine adrenal insufficiency picture and needs urgent medical assessment.
• ⚠️ DO NOT SUPPLEMENT DHEA ON A LOW RESULT ALONE. It converts to both testosterone and oestrogen, the dose-response is unpredictable and individual, and in women it commonly produces acne and hair changes. It is a prescription-grade decision in most of the world for good reason.

Ingredients with evidence in our library

• Ashwagandha (Withania somnifera)emerging -- 3 rows, 2 human, on cortisol in stressed human subjects, plus a randomised double-blind placebo-controlled crossover examining hormonal effects including DHEA-S. The mechanism is the one that matters here: lowering sustained cortisol demand frees the shared pregnenolone precursor. (3 studies in our library, 2 in people)
• Reducing the cortisol demand -- sleep, training load, recoverysolid -- DHEA and cortisol are made from the same precursor, so the reliable route to a better cortisol:DHEA-S ratio is lowering the competing demand rather than supplying DHEA. Unglamorous, and it is what the physiology actually says. (1358 studies in our library, 586 in people)
• Adequate energy availabilityemerging -- DHEA-S falls with restrictive eating and over-training alongside low T3 and low leptin -- the low-energy-availability pattern. In that picture more food raises it and supplements do not. (71 studies in our library, 22 in people)
• ⚠️ Supplemental DHEA is not a wellness supplementcontested -- It converts to both testosterone and oestrogen with an unpredictable individual dose-response, commonly causes acne and hair changes in women, and is prescription-controlled in much of the world for good reason. A low age-adjusted result is not on its own a reason to take it. (71 studies in our library, 22 in people)

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

Movement & practices with evidence in our library

• HIIT / sprint intervalsemerging -- A systematic review of 33 studies found exercise training increased testosterone, SHBG, IGF-1, hGH, and DHEA across all ages over 40 years regardless of training modality (endurance, HIIT,... (2 studies in our library, 1 in people)

Counts are of studies in our citation library that name this marker and involve that practice. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

What people often feel when it runs high

• None, at any level, ever. Lp(a) is inherited, largely fixed after young adulthood, and produces no sensation -- which is why the great majority of people carrying a high level do not know.
• The signal is family history rather than symptom: early heart attack or stroke in a parent or sibling, especially before about 55 in men and 65 in women, and particularly where cholesterol looked unremarkable.

What people often feel when it runs low

• No recognised consequence.

Patterns it travels in

• LP(a) HIGH + APOB NORMAL is the classic miss. Standard lipid panels do not see Lp(a) at all, so risk that is entirely real reads as an entirely clean report.
• LP(a) HIGH + APOB HIGH is additive -- each contributes particles independently, and the practical response is to manage the modifiable one harder, because Lp(a) itself has no nutrition lever.
• MEASURE ONCE, NOT SERIALLY. About 80-90% of the level is genetic and stable for life. Repeat testing is one of the commonest wasted lab spends; the number's job is to recalibrate how aggressively everything else gets managed.

Ingredients with evidence in our library

• ⛔ Nothing in food or supplements meaningfully moves Lp(a) -- and our brain independently reached the same conclusion.solid -- `Labs/Nutrients/Foods-Per-Marker-Matrix.md` tags this [SOLID that diet has essentially no leverage here]. The level is roughly 80-90% genetically fixed and set for life after young adulthood. Measured across the approved library, only 15 rows name Lp(a) at all. Pharmacologic-dose niacin lowers it 20-25% in meta-analysis and the outcome trials (AIM-HIGH, HPS2-THRIVE) showed no cardiovascular benefit. (15 studies in our library, 8 in people)
• What to do instead -- and it is not nothingsolid -- The practical value of knowing a high Lp(a) is to manage everything modifiable more aggressively: ApoB, blood pressure, and not smoking. That is a real change in plan, which is why the test is worth doing once even though nothing moves the number itself. (659 studies in our library, 198 in people)
• ⚠️ Dietary trans fat raises itemerging -- One of the few dietary signals that exists at all here, and it runs in the harmful direction. Our library holds cis and trans fatty acids measured on serum Lp(a) in humans. (1 studies in our library, 1 in people)

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

What people often feel when it runs high

• Silent in itself. The small-dense pattern travels with the metabolic picture that does produce sensation -- the post-meal energy crash, the central weight that will not shift, the creeping blood pressure.

What people often feel when it runs low

• Silent. A large-buoyant-predominant pattern is generally the more favourable one.

Patterns it travels in

• SMALL DENSE LDL + TRIGLYCERIDES HIGH + HDL LOW is one physiological event with three names. Triglyceride-rich particles exchange lipid with LDL and HDL, leaving LDL small and dense and HDL depleted. If triglycerides and HDL already show the pattern, the subfraction test rarely changes what anyone does.
• SMALL DENSE LDL + FASTING INSULIN HIGH points upstream to insulin resistance as the driver -- which is where the intervention belongs, rather than at the lipid itself.
• ⚠️ THE TEST IS OFTEN REDUNDANT. Given ApoB plus triglycerides plus HDL, subfraction testing adds little and costs more. It earns its place mainly when ApoB and LDL-C disagree sharply and the reason matters.

Ingredients with evidence in our library

• Omega-3 (EPA/DHA)emerging -- The only intervention in this library measured directly on lipoprotein SUBFRACTIONS and particle size rather than on total LDL -- long-term fish oil shifted subfraction distribution and LDL size. Effect on total particle number stays modest. (3 studies in our library, 2 in people)
• Carbohydrate load, as the upstream leversolid -- Small-dense LDL is downstream of triglyceride-rich particles, so the levers that lower triglycerides -- reduced refined carbohydrate and alcohol, weight loss -- shift the pattern more reliably than anything aimed at LDL directly. The evidence for this sits under the triglyceride marker, not this one. (659 studies in our library, 198 in people)

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

Movement & practices with evidence in our library

• Aerobic / endurance (Zone-2)emerging -- Aerobic exercise training for ≥12 weeks at moderate intensity improved apolipoprotein ratios and lipoprotein subfractions in 3194 participants across 57 randomized trials, reducing cardiovascular... (4 studies in our library, 2 in people)

Counts are of studies in our citation library that name this marker and involve that practice. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

Diet patterns with evidence in our library

• High-fiber / whole-grainemerging -- In healthy habitual non-whole grain consumers, 6 weeks of whole grain products reduced total, LDL, and non-HDL cholesterol without changing microbiota diversity or glucose. (2 studies in our library, 2 in people)

Counts are of studies in our citation library that name this marker and involve that diet pattern. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

What people often feel when it runs high

• Hunger that does not switch off after an adequate meal -- the signal is present but not being heard.
• Weight that regains quickly after successful loss, out of proportion to what is being eaten.
• Low drive and cold intolerance during dieting -- falling leptin is one of the signals that tells the body to spend less energy.
• ⚠️ HIGH LEPTIN IS THE NORMAL FINDING IN STORED FAT, not a disorder in itself. It is interpretable only against body composition, which is why the number alone is close to meaningless.

What people often feel when it runs low

• Persistent hunger, cold hands and feet, low mood and stalled menstrual cycles -- the low-energy-availability pattern seen in restrictive eating and in over-training.
• In women, cycles that lengthen or stop. Leptin is one of the signals reproduction reads to decide whether there is enough energy available.

Patterns it travels in

• LEPTIN HIGH + FASTING INSULIN HIGH + TRIGLYCERIDES HIGH is the leptin-resistance picture -- plenty of signal, poor reception. Triglycerides themselves impair leptin transport across the blood-brain barrier, which is a rare case of a lipid marker directly explaining a hormone one.
• LEPTIN LOW + AMENORRHOEA + LOW T3 + LOW DHEA-S is energy deficiency, and it is the pattern most often mistaken for a thyroid problem. The correction is more food, not more supplementation.
• ⚠️ RARELY WORTH ORDERING. Leptin almost never changes what anyone does that body composition, insulin and triglycerides have not already said more cheaply. Its real use is confirming low energy availability in an athlete or a restrictive eater.

Ingredients with evidence in our library

• The library is genuinely thin here, and the honest answer is to say so.contested -- Measured across the whole approved library: 162 rows name leptin, but only 29 carry ingredient tags and almost none of those are human trials with leptin as the endpoint. This is one of the few markers where the shortage is real rather than a matching failure -- the same search that returns 18 human-typed zinc rows for glucose returns essentially nothing here. (162 studies in our library, 53 in people)
• Vitamin Demerging -- Supplementation moved leptin and interleukin-6 together in women post-intervention -- the only reasonably clean human signal on this marker in our library. (5 studies in our library, 2 in people)
• Sleep and energy availability, not a supplementsolid -- Leptin is set by fat mass, energy balance and sleep. Short sleep lowers leptin and raises ghrelin within days in controlled studies. Nothing in a bottle competes with that, and a page implying otherwise would be inventing evidence this library does not hold.

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

Movement & practices with evidence in our library

• Sleep (duration / timing)solid -- This narrative review found that people who regularly slept under 7 hours per night were more likely to have higher BMI and develop obesity, with experimental sleep restriction linked to increased... (33 studies in our library, 12 in people)
• Light / circadianmixed -- In 17 healthy young adults undergoing a 32-day study imposing chronic circadian disruption, hunger and appetite significantly decreased across multiple domains in both control and sleep-restricted... (17 studies in our library, 5 in people)
• Resistance / strength trainingmixed -- In 21 children with type 1 diabetes, 32 weeks of isolated progressive resistance training 2 times weekly decreased HbA1c significantly and increased serum adiponectin independently of diet changes. (7 studies in our library, 5 in people)
• Aerobic / endurance (Zone-2)mixed -- In 26 overweight males completing exercise program, short-term aerobic training increased circulating adiponectin levels and improved insulin sensitivity in 19 participants with complete data. (6 studies in our library, 3 in people)
• Meditation / mindfulnessemerging -- In a randomized trial of 102 nurses, an 8-week mindfulness meditation program reduced perceived stress, somatic symptoms, IL-6 and leptin levels compared to a non-meditation group, though... (2 studies in our library, 1 in people)

Counts are of studies in our citation library that name this marker and involve that practice. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

Diet patterns with evidence in our library

• Time-restricted / fastingmixed -- In a 3-month trial of 90 adults with overweight or obesity, early time-restricted eating combined with calorie restriction produced greater reductions in fat mass, BMI, fasting glucose, and leptin... (9 studies in our library, 5 in people)
• Mediterranean dietemerging -- An umbrella review of 30 reviews covering 225 primary studies found the Mediterranean diet beneficially associated with C-reactive protein, interleukin-6 and adiponectin, and vegetarian diets... (5 studies in our library, 2 in people)
• Diet quality / healthy patternmixed -- In 1,806 multiethnic participants, better diet quality significantly associated with higher carotenoids, adiponectin, and HDL-cholesterol; lower CRP, triglycerides, glucose, and HOMA-IR;... (5 studies in our library, 4 in people)
• Low-carb / ketogenicemerging -- In 58 children with obesity completing 4-month ketogenic diet, fasting insulin and cortisol decreased significantly, adiponectin increased, and all 8 girls with PCOS achieved spontaneous menstrual... (3 studies in our library, 2 in people)

Counts are of studies in our citation library that name this marker and involve that diet pattern. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

What people often feel when it runs high

• Joint pain and stiffness that is WORSE IN THE MORNING and eases with movement -- the opposite of mechanical wear, which worsens through the day. That single distinction is the most useful question there is here.
• Symmetrical small-joint swelling -- both hands, both wrists.
• Prolonged morning stiffness, over about 30-60 minutes.
• Fatigue that is disproportionate and unrefreshing.
• Dry eyes and dry mouth.
• Rashes, particularly across the cheeks or triggered by sun.
• Raynaud's -- fingers going white then blue in the cold.
• Unexplained low-grade fevers, hair loss, mouth ulcers.
• ⚠️ A POSITIVE ANA IS COMMON IN PEOPLE WITH NOTHING WRONG. Roughly 1 in 5 healthy adults tests positive at low titre, more in older women. On its own it means very little, and it has caused an enormous amount of unnecessary fear.

What people often feel when it runs low

• A negative result is the expected one and carries no symptoms.

Patterns it travels in

• ⚠️ NEVER ORDER THIS WITHOUT SYMPTOMS. A positive ANA in someone with no symptoms generates anxiety, more tests and no benefit. It belongs in a panel only when the morning-stiffness, symmetrical-swelling picture is actually present.
• ANA POSITIVE + HS-CRP HIGH + SYMPTOMS is a very different result from ANA positive alone -- inflammation confirms something is active.
• ANA POSITIVE + TPO ANTIBODIES POSITIVE -- autoimmunity clusters. Thyroid autoimmunity is the commonest, and finding one is a reason to check the other.
• AUTOIMMUNITY + FERRITIN LOW + B12 LOW is the coeliac / autoimmune gastritis pattern -- one gut lining problem producing several deficiencies, and worth testing for directly.
• RHEUMATOID FACTOR IS ALSO POSITIVE in hepatitis C, in chronic infections and in a fair share of healthy older people. Anti-CCP is far more specific and is the better test when the question is genuinely rheumatoid.

Ingredients with evidence in our library

• Vitamin D -- the VITAL result, which is a prevention signal, not a treatment oneemerging -- VITAL (25,871 participants) found vitamin D supplementation reduced INCIDENT autoimmune disease diagnoses by 22% over about 5.3 years. ⚠️ Read that precisely: it is population-level prevention. It is NOT evidence that vitamin D lowers an already-positive ANA titre in someone with established disease, and our brain's `Panels/Autoimmune.md` states that distinction explicitly. (43 studies in our library, 9 in people)
• A supervised fast followed by gluten-free vegan then lacto-vegetarian eatingsolid -- One of the very few dietary interventions in the whole Labs folder with a genuinely positive, replicated RCT in an established autoimmune disease -- significant improvement in tender and swollen joint counts, ESR and CRP, sustained to one year. The trial base remains modest and it requires supervision, but it is real and it is more than most supplements can show. (1 studies in our library, 1 in people)
• Omega-3 (EPA/DHA)emerging -- The signal is stronger in people genetically AT RISK for rheumatoid arthritis -- lower RF and anti-CCP positivity -- than in people with already-established disease, where the evidence is genuinely mixed. The direction of that difference matters and is usually left out. (355 studies in our library, 205 in people)
• ⛔ Nothing reverses an already-positive antibody titresolid -- No food reverses a positive ANA, rheumatoid factor, anti-CCP, or any ENA-panel antibody (anti-dsDNA, anti-Sm, SSA/Ro, Scl-70, Jo-1, centromere). Our own `Panels/Autoimmune.md` states this outright, and it is stated here rather than softened because someone with a positive result deserves to know where the leverage genuinely is -- on inflammation and symptoms, not on the titre. (78 studies in our library, 40 in people)

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

Movement & practices with evidence in our library

• Sunlight / UVBemerging -- Review: vitamin D3 synthesized from skin UVB exposure or obtained from diet; deficiency may cause osteoporosis, autoimmune disease, cancer, and hypertension development. (13 studies in our library, 1 in people)
• Yogamixed -- A protocol for an ongoing single-arm pilot offering eight weeks of yoga classes to 20 urban minority adults with osteoarthritis or rheumatoid arthritis; it measures feasibility and acceptability... (9 studies in our library, 3 in people)
• Tai chimixed -- Cochrane review of 7 RCTs (345 participants) found very low-quality evidence that Tai Chi-based exercise provides clinically important pain improvement in rheumatoid arthritis; participants were... (5 studies in our library, 3 in people)
• Light / circadianemerging -- In vitiligo patients treated with 308-nm excimer light therapy, ANA-positive facial and neck lesions more often achieved moderate but not excellent repigmentation compared with ANA-negative... (4 studies in our library, 2 in people)
• Meditation / mindfulnessemerging -- In a pilot of 26 adults with lupus, the 15 assigned to mindfulness reported better quality of life and less pain-related inflexibility and shame than 11 on a waitlist; the comparator was inactive... (4 studies in our library, 2 in people)
• Breathwork / breathingemerging -- In 40 women with systemic sclerosis, 12 weeks of diaphragmatic breathing tele-exercise lowered serum cortisol, anxiety, depression, fatigue, blood pressure, and respiratory and pulse rates... (3 studies in our library, 2 in people)
• Spiritual / religious practiceemerging -- A cross-sectional study of Greek patients with rheumatoid arthritis and systemic lupus erythematosus examined how spirituality and medication adherence related to their quality of life. (2 studies in our library, 1 in people)
• Social connection / belongingemerging -- A systematic review of studies on cancer, HIV, cardiac disease, MS, and rheumatoid arthritis found post-traumatic growth was consistently linked to social support quality, coping strategies, and... (2 studies in our library, 2 in people)

Counts are of studies in our citation library that name this marker and involve that practice. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

Diet patterns with evidence in our library

• Plant-based / veganmixed -- Randomized, single-blind controlled trial (27 vs. 26 patients): fasting then gluten-free vegan/lacto-vegetarian diet significantly improved joint counts, pain, ESR, CRP, and HAQ score vs. control,... (3 studies in our library, 3 in people)
• Mediterranean dietemerging -- Mediterranean diet adherence showed no significant association with metabolic syndrome prevalence in SLE patients, though lower MetS prevalence observed may reflect overall diet adherence in this... (2 studies in our library, 1 in people)

Counts are of studies in our citation library that name this marker and involve that diet pattern. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

What people often feel when it runs high

• High SHBG lowers FREE testosterone even when total testosterone reads perfectly normal: low libido, low drive, fatigue, loss of muscle.
• Raised by oestrogen (including the oral contraceptive pill and oral HRT -- but not transdermal), by thyroid overactivity, by liver disease, and by low energy availability.

What people often feel when it runs low

• SHBG produces no symptoms of its own -- it changes what the sex hormones do, so the symptoms are theirs.
• Low SHBG raises FREE testosterone: in women, acne, unwanted hair, scalp thinning, irregular cycles.
• ⚠️ A LOW SHBG IS ONE OF THE EARLIEST AND MOST OVERLOOKED SIGNS OF INSULIN RESISTANCE. Insulin suppresses hepatic SHBG production directly, so a falling SHBG is a metabolic signal appearing in a hormone panel -- often before glucose moves.

Patterns it travels in

• SHBG IS NOT A STANDALONE TEST -- IT IS THE NUMBER THAT MAKES TESTOSTERONE READABLE. Total testosterone normal with a high SHBG means low free testosterone, and the person feels exactly as though their testosterone were low, because functionally it is.
• SHBG LOW + FASTING INSULIN HIGH + TRIGLYCERIDES HIGH + ALT HIGH is the metabolic/fatty-liver picture. SHBG is made in the liver and suppressed by insulin, which is why it belongs to that cluster as much as to the hormone one.
• SHBG LOW + TESTOSTERONE HIGH + LH:FSH RAISED is the PCOS pattern, and the insulin is usually the driver of both.
• SHBG HIGH + ORAL OESTROGEN -- ask before investigating. Oral oestrogen passes through the liver and raises SHBG substantially; transdermal does not. This alone explains a large share of unexpected results.
• SHBG HIGH + FREE T4 HIGH -- thyroid overactivity raises it.
• ⚠️ OUR LIBRARY HOLDS ALMOST NOTHING ON SHBG (19 rows, 4 tagged). Its value here is entirely as an interpretive key for other markers, and that is how it should be presented.

Ingredients with evidence in our library

• Improving insulin sensitivity -- the only reliable leversolid -- SHBG rises as insulin falls. Weight loss, reduced refined carbohydrate, and exercise raise it more dependably than anything taken, because they remove the thing suppressing it. Our library's inositol row (myo- and D-chiro- at 40:1 on hormonal and metabolic parameters) is the closest thing to a supplement answer, and it works through the same insulin route. (19 studies in our library, 12 in people)
• Inositol (myo- and D-chiro-, 40:1)emerging -- Measured on hormonal and metabolic parameters together in our library -- acts on insulin signalling, which is what governs SHBG. (1 studies in our library, 1 in people)
• DIM / indole-3-carbinolemerging -- One human row on oestrogen-related hormones and metabolites. A single study is a signal to watch, not a basis for a recommendation, and it is listed at that weight. (1 studies in our library, 1 in people)

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

Movement & practices with evidence in our library

• Resistance / strength trainingemerging -- In 27 previously untrained adults over 50 doing 6 weeks of resistance training, hydrogen-rich water twice daily raised free testosterone and cortisol, lowered total and LDL cholesterol, and... (2 studies in our library, 1 in people)
• Sleep (duration / timing)emerging -- In 40 healthy young men, higher body fat correlated with lower free testosterone, while higher intake of cholesterol, folic acid and vitamin A was linked to lower morning cortisol, and poor sleep... (2 studies in our library, 2 in people)
• Light / circadianemerging -- In 10 young versus 10 elderly men over 24 hours, non-SHBG-bound testosterone showed significant circadian rhythm in young men but blunted rhythmicity in elderly men with lower mean levels. (2 studies in our library, 1 in people)
• HIIT / sprint intervalsemerging -- A systematic review of 33 studies found exercise training increased testosterone, SHBG, IGF-1, hGH, and DHEA across all ages over 40 years regardless of training modality (endurance, HIIT,... (2 studies in our library, 2 in people)

Counts are of studies in our citation library that name this marker and involve that practice. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

What people often feel when it runs high

• Often no symptoms. A high AMH with irregular cycles, acne and unwanted hair points at PCOS -- more follicles, each producing AMH.

What people often feel when it runs low

• No symptoms at all in most cases -- AMH is a count of remaining follicles, not a hormone with felt effects, and cycles are usually still perfectly regular when it is low.
• Where it is very low, cycles may shorten (from 28 days to 24-25) before they become irregular. That shortening is often the first real-world sign.
• ⚠️ AMH PREDICTS RESPONSE TO OVARIAN STIMULATION. IT DOES NOT PREDICT NATURAL FERTILITY WELL. A low AMH in a woman with regular cycles does not mean she cannot conceive naturally, and it has caused a great deal of unnecessary distress presented as though it did.

Patterns it travels in

• AMH + ANTRAL FOLLICLE COUNT ON ULTRASOUND together are far better than either alone -- one is chemical, one is visual, and they measure the same thing by different routes.
• AMH LOW + FSH HIGH + OESTRADIOL LOW on day 3 is diminished ovarian reserve confirmed three ways.
• AMH HIGH + LH:FSH RAISED + TESTOSTERONE HIGH + SHBG LOW + INSULIN HIGH is the PCOS cluster, where a high AMH is a feature rather than good news.
• AMH IS STABLE ACROSS THE CYCLE, unlike FSH and oestradiol -- so it can be drawn on any day, which is genuinely useful and often not known.
• ⚠️ HORMONAL CONTRACEPTION LOWERS MEASURED AMH by roughly 20-30%. Interpreting a result taken on the pill as a true reserve is a common and consequential error.
• AMH LOW + FERRITIN LOW -- our library holds iron intake measured in relation to ovarian reserve in women seeking infertility treatment. Worth checking rather than assuming.

Ingredients with evidence in our library

• ⛔ No food or nutrient in controlled human trials raises AMH or reverses ovarian reserve decline.solid -- Our brain's food-to-marker matrix calls this one of the clearest 'no lever exists' entries in the entire Labs folder, and tags it [SOLID that no lever exists]. The follicle pool is fixed at birth and non-renewable. This is written plainly because the audience for this marker is often distressed and is being sold things that cannot work. (52 studies in our library, 29 in people)
• CoQ10 -- for oocyte quality, which is a different question from reserveemerging -- Systematic review and meta-analysis of 6 RCTs in 1,529 patients with diminished ovarian reserve. The plausible target is the QUALITY of the follicles that remain and the response to stimulation -- oocytes are the most mitochondria-dense cells in the body. It does not grow the pool back, and the page should not imply it does. (3 studies in our library, 2 in people)
• Iron status and ovulatory functionemerging -- The Nurses' Health Study II found lower ovulatory infertility risk with iron supplementation -- but this is dated and has not been consistently replicated for ovarian reserve specifically. Tagged [EMERGING/dated] in our own matrix, and repeated at that weight here. (1 studies in our library, 1 in people)
• Reducing cadmium and lead exposure -- smoking above allemerging -- Our library holds heavy metal toxicity versus trace element protection in women's reproductive health. Smoking is the single most consistent modifiable association with accelerated reserve decline, and it is a subtraction with better evidence than any addition on this marker. (1 studies in our library, 1 in people)

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

What people often feel when it runs high

• HIGH OESTROGEN RELATIVE TO PROGESTERONE: heavy or painful periods, breast tenderness, fluid retention, worsening premenstrual mood, headaches around the period.
• HIGH TESTOSTERONE in women: acne, unwanted hair, scalp thinning, irregular or absent cycles -- the PCOS picture.
• HIGH FSH with low oestradiol is the menopause transition signal.

What people often feel when it runs low

• LOW OESTRADIOL: hot flushes and night sweats, vaginal dryness, poor sleep, low mood, brain fog and word-finding difficulty -- 'word finding difficulty perimenopause' is a captured search phrase, and one of the most under-served questions there is.
• Joint aches that appeared with no injury; skin and hair changing texture.
• LOW PROGESTERONE: shorter cycles, spotting before a period, poor sleep in the second half of the cycle, anxiety that is cyclical rather than constant.
• LOW TESTOSTERONE (in women too): low libido, low drive, loss of muscle tone, flat mood.

Patterns it travels in

• ⚠️ TIMING IS THE WHOLE TEST IN A CYCLING WOMAN. Oestradiol and progesterone mean nothing without knowing the cycle day -- progesterone is measured around day 21 (or 7 days before the expected period) to confirm ovulation happened at all. A random draw is wasted money, and this is the single commonest error with this panel.
• FSH HIGH + OESTRADIOL LOW + cycles changing is the perimenopause-to-menopause signal. In perimenopause FSH swings wildly month to month, so ONE normal FSH does not exclude it.
• LH:FSH RATIO RAISED + TESTOSTERONE HIGH + DHEA-S HIGH + FASTING INSULIN HIGH + SHBG LOW is the PCOS cluster. Insulin is the driver in most cases -- it lowers SHBG, which raises free testosterone, which is why the metabolic markers belong in a hormone panel.
• TESTOSTERONE 'NORMAL' + SHBG HIGH = LOW FREE TESTOSTERONE. Total testosterone alone misses this completely; SHBG is what makes the total number interpretable.
• OESTRADIOL LOW + FSH NORMAL + PROLACTIN HIGH points elsewhere entirely and needs a clinician.
• SEX HORMONES + THYROID + FERRITIN TOGETHER. Thyroid dysfunction and iron deficiency both disrupt cycles and both produce the same fatigue and hair loss -- reading hormones without them attributes to hormones what belongs to iron.
• OESTRADIOL LOW + VITAMIN D LOW -- our library holds vitamin D supplementation measured on fatigue and mood in perimenopausal women specifically (28 rows, 14 human), the largest signal on this marker group.

Ingredients with evidence in our library

• Vitamin Dsolid -- 28 rows, 14 human -- the largest and most human-weighted signal here, measured on fatigue and mood in perimenopausal women directly rather than on hormone levels. (28 studies in our library, 14 in people)
• Ashwagandhasolid -- 15 rows, 10 human -- cognitive and physical function measured in this population. Also lowers the cortisol competing for the same precursor pool. (15 studies in our library, 10 in people)
• Chasteberry (Vitex agnus-castus)solid -- 19 rows, 6 human -- the best-evidenced botanical in our library for premenstrual symptoms specifically, acting on prolactin and the luteal phase rather than on oestrogen. (19 studies in our library, 6 in people)
• Soy isoflavones (genistein, daidzein)mixed -- 9 rows -- systematic review evidence on menopausal symptoms in perimenopausal women. Effect depends heavily on whether someone's gut bacteria produce equol, which is why results vary so much between individuals and between populations. (9 studies in our library, 2 in people)
• Black cohosh (Actaea racemosa)mixed -- 17 rows. Widely used for vasomotor symptoms; our library also holds a meta-analysis finding NO evidence of the hepatotoxicity it has been accused of. Mechanism is not oestrogenic, which matters for who can consider it. (17 studies in our library, 3 in people)
• Magnesium, B vitamins, vitamin C and zinc togetheremerging -- 12 rows, 6 human -- our library holds these measured as a combination on this population rather than singly, which is closer to how they are actually taken. (8 studies in our library, 0 in people)
• Zincemerging -- 15 rows -- systematic review of the correlation between serum zinc and testosterone. Relevant in both sexes, and to the PCOS picture from the other direction. (15 studies in our library, 5 in people)

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

Movement & practices with evidence in our library

• Resistance / strength trainingsolid -- In 27 previously untrained adults over 50 doing 6 weeks of resistance training, hydrogen-rich water twice daily raised free testosterone and cortisol, lowered total and LDL cholesterol, and... (26 studies in our library, 11 in people)
• Sleep (duration / timing)solid -- In 16 premenopausal women tracked for 8 weeks, naturally cycling participants' blood estradiol and progesterone levels positively predicted their daily calorie and added-sugar intake, while... (25 studies in our library, 20 in people)
• Light / circadianmixed -- 4 weeks of daily 900 MHz GSM mobile phone exposure did not disrupt circadian hormone profiles of prolactin, thyroid-stimulating hormone, ACTH, or testosterone in men, though maximum growth hormone... (13 studies in our library, 3 in people)
• Yogamixed -- In a meta-analysis of 18 randomized trials with 1,572 perimenopausal and postmenopausal women, mind-body practices including yoga, mindfulness, music and dance were linked to moderate to large... (8 studies in our library, 8 in people)
• Singing / choralemerging -- In 42 healthy women undergoing a social-evaluative stress task involving hearing their own karaoke singing, higher blood estradiol was linked to lower pupil-dilation arousal, while more deep... (3 studies in our library, 1 in people)
• Meditation / mindfulnessemerging -- In a meta-analysis of 18 randomized trials with 1,572 perimenopausal and postmenopausal women, mind-body practices including yoga, mindfulness, music and dance were linked to moderate to large... (3 studies in our library, 2 in people)

Counts are of studies in our citation library that name this marker and involve that practice. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

Diet patterns with evidence in our library

• Low-carb / ketogenicmixed -- ketogenic diet 44 kg; the glucose homeostasis and lipid profile were improved significantly; serum vitamin D, LH, and TT levels were increased and the PSA levels were decreased significantly as... (5 studies in our library, 4 in people)

Counts are of studies in our citation library that name this marker and involve that diet pattern. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

What people often feel when it runs high

• Frequently NOTHING -- which is the entire reason PSA is measured rather than waited for.
• Where urinary symptoms exist they usually reflect benign enlargement rather than anything sinister: weaker stream, hesitancy, incomplete emptying, getting up at night.
• ⚠️ PSA IS PROSTATE-SPECIFIC, NOT CANCER-SPECIFIC. It rises with benign enlargement, with prostatitis, with a urinary infection, after cycling, after ejaculation within 48 hours, and after any prostate examination or instrumentation. Repeat an unexpected result before acting on it -- a substantial share normalise.

What people often feel when it runs low

• No symptoms. ⚠️ Note that finasteride and dutasteride roughly HALVE PSA -- a result on either must be doubled to be interpreted, and forgetting this hides real findings.

Patterns it travels in

• FREE:TOTAL PSA RATIO adds real information when total PSA is borderline -- a higher free fraction points toward benign enlargement. PSA DENSITY and PSA VELOCITY (rate of change over time) both do more than a single value.
• ⚠️ THE TREND MATTERS MORE THAN THE NUMBER. One PSA is a data point; three over eighteen months is a direction.
• PSA RAISED + urinary symptoms + recent infection -- treat and repeat before escalating.
• PSA + TESTOSTERONE together where testosterone therapy is being considered, since it is a monitoring requirement.
• PSA + VITAMIN D + SELENIUM -- ⚠️ and a caution that belongs here: the SELECT trial found selenium and vitamin E supplementation did NOT prevent prostate cancer, and the vitamin E arm showed a statistically significant INCREASE. Our library holds this. It is the clearest example we have of a plausible mechanism failing at trial, and anyone selling either for prostate health is contradicting the best evidence that exists.
• PSA DECISIONS ARE SHARED DECISIONS. Screening reduces mortality modestly and causes real overdiagnosis harm; the honest framing is a conversation with a doctor, not a recommendation from us.

Ingredients with evidence in our library

• Lycopene (cooked tomato, watermelon)emerging -- 29 rows, 12 human -- the largest signal on this marker in our library, including prospective cohort evidence on intake and prostate cancer risk. Absorption is far better from cooked and oil-containing preparations than from raw tomato. (29 studies in our library, 12 in people)
• Green tea catechins / EGCGemerging -- 6 rows including a prospective randomised trial measuring blood AND prostate tissue concentrations -- unusually direct evidence that the compound reaches the tissue in question. (6 studies in our library, 3 in people)
• ⚠️ Selenium -- the negative result that must travel with itcontested -- 12 rows including 'Selenium for preventing cancer'. The SELECT trial did NOT show prevention, and this is exactly the kind of high-quality negative finding our library exists to keep in front of people rather than quietly omit. (12 studies in our library, 6 in people)
• ⚠️ Vitamin E -- a signal of harm, not benefitcontested -- 15 rows, 11 human. In SELECT, the vitamin E arm showed a statistically significant INCREASE in prostate cancer incidence. This is listed because omitting it would be the dishonest choice, not because it is a recommendation. (15 studies in our library, 11 in people)
• Reishi (Ganoderma lucidum)emerging -- 5 rows -- laboratory work on prostate cancer cell lines. ⚠️ Cell-line evidence is not human evidence, and the Cochrane review of reishi found the human evidence insufficient. Listed at its true weight. (5 studies in our library, 3 in people)

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

Movement & practices with evidence in our library

• Social connection / belongingemerging -- In an observational study of prostate cancer peer and caregiver navigators, mental health and quality of life stayed favorable over six months, and navigators reported benefit finding through... (3 studies in our library, 2 in people)
• Aerobic / endurance (Zone-2)emerging -- In 21 breast and prostate cancer patients, both standard and polarized 12-week endurance training programs modulated NK cell receptors (NKG2D increase, KIR2DL1 decrease). (3 studies in our library, 2 in people)
• Light / circadianemerging -- In rats with human prostate cancer xenografts, daytime blue light exposure amplified nighttime melatonin levels, delaying tumor onset and reducing cancer cell metabolism, growth signaling, and the... (2 studies in our library, 1 in people)
• Meditation / mindfulnessemerging -- A systematic review of 10 studies found positive psychology interventions such as mindfulness and resilience therapy were associated with reduced psychological distress, anxiety and mood disorders... (2 studies in our library, 2 in people)
• Sleep (duration / timing)emerging -- In 76 men with benign prostate enlargement, adding Pranic healing sessions to medication for five weeks improved symptom and sleep quality scores more than medication alone, in a single-blind... (2 studies in our library, 1 in people)

Counts are of studies in our citation library that name this marker and involve that practice. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

What people often feel when it runs high

• NONE that anyone can feel. PFAS exposure produces no symptom at any realistic level -- it is found by measurement or by history, never by how someone feels.
• What shows up instead are findings on other tests: raised cholesterol is the most consistently reported association, along with liver enzyme changes and reduced antibody response to vaccination.
• ⚠️ THE HONEST FRAMING IS EXPOSURE, NOT ILLNESS. Essentially everyone tested has detectable PFAS. A detectable level is the normal finding, and presenting it as a personal health crisis is neither accurate nor kind.

What people often feel when it runs low

• No symptoms. Lower is the desirable direction.

Patterns it travels in

• PFAS + CHOLESTEROL is the most consistent association in the literature (24 rows in our library carry both) and it runs in a direction people find surprising -- higher PFAS with higher cholesterol. Causation is not settled and the association is confounded by how both behave in blood.
• PFAS + ALT/GGT -- liver is where PFAS concentrate, and enzyme changes are among the more reproducible findings.
• PFAS + IMMUNOGLOBULIN RESPONSE -- our library holds perfluoroalkyl exposure and IgE in a Korean cohort. Reduced vaccine antibody response is one of the better-supported human effects.
• PFAS + THYROID -- disruption of thyroid hormone binding and transport is a documented mechanism, so thyroid markers belong alongside an exposure panel.
• PFAS + eGFR -- the kidney handles excretion, and reduced filtration raises measured levels without more exposure.
• ⚠️ THE HISTORY IS THE TEST. Drinking water source, occupation, firefighting foam, older non-stick cookware, stain-resistant treatments and grease-proof food packaging tell you more than the number does -- and unlike the number, they can be changed.

Ingredients with evidence in our library

• ⚠️ NOTHING IN THIS LIBRARY REMOVES PFAS FROM A PERSON, AND SAYING OTHERWISE WOULD BE A LIE.solid -- 923 rows name PFAS and only 79 carry any ingredient tag -- the vast majority are exposure, occurrence and toxicology work, not intervention work. PFAS have half-lives measured in years, and there is no supplement with evidence of accelerating that. This is stated first because it is the most important thing on the page. (923 studies in our library, 688 in people)
• Reducing exposure -- the only intervention with evidencesolid -- Filtered drinking water (reverse osmosis and activated carbon both reduce PFAS), replacing worn non-stick cookware, avoiding grease-proof food packaging and stain treatments. This is where the effort belongs. (923 studies in our library, 688 in people)
• Supporting the body's own excretion pathways -- carefully framedemerging -- Per `Labs/Toxicity/DETOX-CLAIMS-POSITION.md`, the strongest claim we may make is supporting endogenous detoxification: the nutrients phase I/II conjugation is built from, and the fibre and fluid that carry products out. Some PFAS undergo enterohepatic recirculation, which is the mechanism behind interest in bile-acid-binding fibre -- our library holds only 3 insoluble-fibre rows on this, so it is a hypothesis worth naming and not a recommendation. (3 studies in our library, 0 in people)
• ⛔ What we do not saysolid -- That any supplement detoxes, removes, pulls or cleanses PFAS. That sauna or exercise clears a body burden. Our own measurement found exercise-and-toxicant-excretion at 4 rows with 0 human-typed -- the weakest claim in the whole detox position, and one we have written down specifically so it is never made.

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

Diet patterns with evidence in our library

• High-fiber / whole-grainemerging -- In 72 Canadian adults with high cholesterol, PFOSA, PFOS, PFOA and PFHxS were detected in all participants' blood, and a 4-week dietary fiber intervention was linked to a drop in long-chain PFAS... (2 studies in our library, 2 in people)

Counts are of studies in our citation library that name this marker and involve that diet pattern. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

What people often feel when it runs high

• At ordinary environmental exposure, none. Aluminium is the third most abundant element in the earth's crust and everyone has some.
• Meaningful accumulation happens overwhelmingly in ONE situation: reduced kidney function, because the kidney is the only meaningful route out. In that setting it affects bone and the nervous system.
• Symptoms where they occur: bone pain and fractures (aluminium interferes with bone mineralisation), muscle weakness, and cognitive change.
• ⚠️ THE ALUMINIUM-AND-DEMENTIA QUESTION IS GENUINELY UNSETTLED, not settled either way. Our library holds a systematic review of metal(loid)s in biospecimens and dementia. Overstating it is dishonest; dismissing it is also dishonest. The accurate word is 'associated, mechanism plausible, causation not established'.

What people often feel when it runs low

• No symptoms. Aluminium has no known biological requirement -- there is no deficiency.

Patterns it travels in

• ALUMINIUM + eGFR IS THE PAIR THAT MATTERS. Reduced filtration is what turns ordinary exposure into accumulation. Reading an aluminium level without kidney function tells you very little.
• ALUMINIUM + PHOSPHATE + CALCIUM -- our library holds aluminium hydroxide's effect on serum phosphate and FGF23 directly. Aluminium-containing antacids and phosphate binders are a real exposure route in people with kidney disease, and the interaction is with bone.
• ALUMINIUM + IRON -- they share transferrin as a transport protein, so IRON DEFICIENCY INCREASES ALUMINIUM UPTAKE. 34 rows in our library carry both. This is the clearest example in the toxicity group of a nutrient deficiency directly increasing an exposure.
• ALUMINIUM + SILICON. Our library's silica wave (2026-09-04) found the specific mechanism: silicic acid forms hydroxyaluminosilicates and increases urinary aluminium excretion -- 'The role of silicic acid in the renal excretion of aluminium' (1996) and 'Silicic acid: its gastrointestinal uptake and urinary excretion in man' (1999). ⛔ THOSE ARE CANDIDATES, NOT YET IN THE APPROVED LIBRARY, and may not be cited on a page until authored and merged.
• ALUMINIUM + MAGNESIUM -- 12 rows, 7 human, mostly antacid pharmacokinetics. Aluminium- and magnesium-containing antacids also change absorption of other medicines, which is a practical point worth more than the toxicology to most people.
• ⚠️ ANTIPERSPIRANTS: our library holds 64 rows on aluminium chloride versus aluminium lactate formulations. Dermal absorption is very low and the breast cancer link has not held up. Say that plainly rather than feeding a fear we cannot support.

Ingredients with evidence in our library

• Correcting iron deficiencyemerging -- 34 rows carry both tags. Aluminium is absorbed via the iron transport system, so iron deficiency increases uptake. Fixing the deficiency reduces the absorption -- a nutrient intervention with a genuine toxicological mechanism behind it. (34 studies in our library, 8 in people)
• Silicon-rich water and orthosilicic acidemerging -- The one place our measurement said a citation wave was genuinely warranted rather than a search fix -- the aluminium-excretion angle was 11 rows with 3 human before the wave. 1,088 candidates were retrieved on 2026-09-04. ⛔ NOT YET AUTHORISED FOR CITATION: every Takeaway must be authored from the abstract and merged first. Until then this is a promising direction, not a claim. (11 studies in our library, 3 in people)
• Reducing intake -- where it actually comes fromsolid -- Aluminium-containing antacids and buffered aspirin are by far the largest oral sources, dwarfing cookware and foil. Processed cheese and some baking powders carry aluminium additives. This is a subtraction that can be made specifically rather than vaguely. (324 studies in our library, 211 in people)
• ⚠️ Kidney function firstsolid -- In anyone with reduced eGFR, avoiding aluminium-containing medicines matters far more than anything added. This is the only group in whom aluminium is a genuine clinical concern. (12 studies in our library, 2 in people)

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

What people often feel when it runs high

• In adults, usually SILENT at the levels now common. Where symptoms occur: fatigue, headache, irritability, poor concentration, abdominal pain, joint and muscle aches, high blood pressure.
• In children: reduced attention and learning, behavioural change, and developmental delay -- and ⚠️ THERE IS NO THRESHOLD BELOW WHICH LEAD IS KNOWN TO BE SAFE IN CHILDREN. Effects are measurable at levels once called normal.
• Anaemia that does not respond to iron -- lead interferes with haem synthesis directly.
• A blue line at the gum margin is the classic textbook sign and is essentially never seen now.

What people often feel when it runs low

• No symptoms. Lead has no biological function -- there is no deficiency, and lower is always better.

Patterns it travels in

• ⚠️ LEAD + FERRITIN IS THE MOST IMPORTANT PAIR IN THE ENTIRE TOXICITY GROUP. Iron deficiency UPREGULATES the divalent metal transporter that absorbs lead, so an iron-deficient child absorbs several times more lead from the same environment. Correcting iron is genuinely protective -- it is prevention, not detox, and it is the strongest nutrition claim we can make about lead.
• LEAD + CALCIUM -- the same competition. Adequate calcium reduces lead absorption, and in pregnancy adequate calcium reduces mobilisation of stored lead out of the mother's skeleton into the blood.
• LEAD + ZINC -- 21 rows, 8 human, the largest ingredient signal here. Zinc competes with lead at absorption and at the enzymes lead poisons.
• LEAD + HAEMOGLOBIN + MCV -- lead blocks haem synthesis, producing anaemia that iron alone will not fix while exposure continues.
• LEAD + eGFR + URIC ACID + BLOOD PRESSURE -- chronic low-level lead is associated with reduced filtration, raised urate and hypertension. This is where adult lead actually matters.
• ⚠️ BLOOD LEAD MEASURES RECENT EXPOSURE, roughly the last 30 days. Most of the body's lead is in bone with a half-life of decades, and a normal blood lead does not exclude a significant past burden. Bone lead is research-grade, not routine.
• THE HISTORY IS THE TEST: housing built before 1978, renovation of old paint, occupation, imported cosmetics and spices, traditional remedies, water pipes, shooting ranges.

Ingredients with evidence in our library

• Correcting iron deficiency -- the strongest claim we can makesolid -- 11 rows, 6 human. Iron deficiency increases lead absorption through the shared DMT1 transporter. This is prevention with a clear mechanism, and it is particularly consequential in children, who are the population that matters most here. (11 studies in our library, 6 in people)
• Adequate calciumsolid -- 8 rows. Competes with lead at absorption, and in pregnancy reduces skeletal lead mobilisation into blood -- protecting the fetus from the mother's own stored exposure. (8 studies in our library, 3 in people)
• Zincemerging -- 21 rows, 8 human -- the largest ingredient signal on this marker in our library, from children's health modelling around smelter sites. Competes with lead at absorption and at the enzymes it inhibits. (21 studies in our library, 8 in people)
• Vitamin C and vitamin Eemerging -- 14 rows across both tags -- supplementation measured on oxidative damage and total antioxidant capacity in lead-exposed people. This addresses the oxidative consequence of exposure, NOT the lead itself, and the distinction matters. (3 studies in our library, 1 in people)
• Seleniumemerging -- 11 rows, 5 human, including groundwater chemistry and children's blood lead levels. (11 studies in our library, 5 in people)
• ⛔ Removing the source is the only thing that lowers the burdensolid -- Chelation is a medical treatment for high levels with real risks, prescribed and monitored -- never a supplement. Per our detox position, no product may be described as removing lead. What nutrition does here is reduce ABSORPTION, and that framing is both accurate and genuinely useful.

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

What people often feel when it runs high

• Often silent at dietary levels. Where symptoms occur: tingling or numbness in hands, feet and around the mouth, tremor, poor coordination, headache, fatigue, irritability and difficulty concentrating.
• Metallic taste; in higher exposures, mouth and gum problems.
• ⚠️ TWO DIFFERENT MERCURIES BEHAVE DIFFERENTLY. Methylmercury from fish accumulates in nerve tissue and crosses the placenta -- it is the one that matters for pregnancy. Inorganic and elemental mercury (dental amalgam, occupational, some skin-lightening creams) concentrate in the kidney instead. A total blood mercury does not distinguish them, and speciated testing does.

What people often feel when it runs low

• No symptoms. Mercury has no biological function -- there is no deficiency.

Patterns it travels in

• MERCURY + SELENIUM IS THE CENTRAL RELATIONSHIP, and it is the largest signal in our library on this marker (114 rows). Selenium binds mercury with extraordinary affinity -- so mercury both is buffered BY selenium and DEPLETES functional selenium, disabling the selenoenzymes (glutathione peroxidase, the thyroid deiodinases) that depend on it. High mercury can therefore produce a functional selenium deficiency at a normal-looking selenium level.
• THIS IS WHY OILY FISH ARE NOT SIMPLY A MERCURY RISK. Salmon, sardines and anchovies carry far more selenium than mercury; large predatory fish (swordfish, king mackerel, shark, bigeye tuna) carry the reverse. The species matters more than the category, and telling people to avoid fish is worse advice than telling them which fish.
• MERCURY + OMEGA-3 INDEX -- the same food supplies both. Advice that ignores this trades a documented benefit for a speculative harm, particularly in pregnancy where DHA matters most.
• MERCURY + GLUTATHIONE -- 35 rows. Glutathione conjugation is the main excretion route, which is why glutathione status is the relevant nutritional question rather than any binder.
• MERCURY + THYROID -- deiodinases are selenoenzymes, so mercury reaches thyroid function through the selenium route.
• MERCURY + eGFR -- inorganic mercury concentrates in the kidney; check filtration where occupational exposure is plausible.
• THE HISTORY IS THE TEST: fish species and frequency, dental amalgam load, occupation, skin-lightening creams (a genuinely serious and under-recognised source), and broken compact fluorescent bulbs.

Ingredients with evidence in our library

• Seleniumsolid -- 114 rows, 15 human -- the dominant relationship on this marker. Adequate selenium status is the best-supported nutritional buffer against mercury's effects, because the mechanism of harm is largely selenoenzyme inhibition. ⚠️ Selenium has a narrow safe window; this is an argument for adequacy, not for high doses. (114 studies in our library, 15 in people)
• Choosing smaller, shorter-lived fishsolid -- The single most effective intervention, and it keeps the omega-3s. Sardines, anchovies, salmon, herring and mackerel sit at the favourable end of the selenium-to-mercury ratio; large predators sit at the other. A substitution rather than a subtraction. (455 studies in our library, 176 in people)
• Glutathione precursors -- NAC, glycine, sulfur amino acidsemerging -- 35 rows. Mercury is excreted as a glutathione conjugate, so supplying what the body builds glutathione from supports the route that actually exists. Framed per the spec's antioxidant rule: the raw materials, not the antioxidant itself. (35 studies in our library, 6 in people)
• Zincemerging -- 62 rows, 9 human. Induces metallothionein, the protein that binds and sequesters heavy metals -- a real mechanism, measured mostly in animals. (62 studies in our library, 9 in people)
• ⛔ What we do not saymixed -- That any supplement removes mercury. Per `Labs/Toxicity/DETOX-CLAIMS-POSITION.md`, sweat has 34 rows with 12 human-typed as a genuine excretion route with measured metal content -- but no study shows sauna clears a body burden, and we do not claim it does. (34 studies in our library, 12 in people)

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

Diet patterns with evidence in our library

• DASH dietmixed -- Bayesian network meta-analysis of 120 articles (14,923 participants) shows DASH diet was superior to all 22 other nonpharmacologic interventions for lowering systolic (−6.97 mm Hg) and diastolic... (9 studies in our library, 6 in people)
• Mediterranean dietemerging -- In the 1142 older adults completing a 12-month Mediterranean-style diet trial, systolic pressure fell 5.5 mm Hg, augmentation index improved and 24-hour urinary potassium rose 8.8 mmol/L. (2 studies in our library, 2 in people)

Counts are of studies in our citation library that name this marker and involve that diet pattern. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

What people often feel when it runs high

• PROTEIN IN URINE: foamy or frothy urine that persists, swelling of ankles and around the eyes. Often completely silent, which is why it is tested rather than waited for.
• BLOOD IN URINE: sometimes visible, more often not. ⚠️ Visible blood always needs a doctor, even once, even painless -- especially painless.
• GLUCOSE IN URINE: thirst and frequent urination; means blood glucose has exceeded the kidney's reabsorption threshold, or an SGLT2 medication is being taken.
• LEUKOCYTES AND NITRITES: burning, urgency, frequency, cloudy urine -- infection.
• KETONES: fasting, low-carbohydrate eating, or illness. In someone with diabetes and high glucose, ketones are urgent.
• HIGH SPECIFIC GRAVITY: concentrated urine -- dehydration. Dark yellow tells you the same thing for free.

What people often feel when it runs low

• LOW SPECIFIC GRAVITY: dilute urine -- usually just a lot of fluid, but persistently dilute urine with high volumes can reflect a concentrating problem.

Patterns it travels in

• URINE ALBUMIN-TO-CREATININE RATIO IS THE MOST UNDER-ORDERED USEFUL TEST IN THIS WHOLE PANEL. Albuminuria appears years before eGFR falls -- it is the earliest kidney signal available, and it costs almost nothing. A dipstick protein is far less sensitive; ask for the ACR specifically.
• PROTEIN IN URINE + ALBUMIN LOW IN BLOOD -- the kidney is losing it rather than the liver failing to make it. That pairing resolves the question immediately.
• PROTEIN + eGFR FALLING + BLOOD PRESSURE HIGH + GLUCOSE HIGH is the commonest kidney trajectory there is, and every element of it is modifiable.
• GLUCOSE IN URINE + NORMAL BLOOD GLUCOSE = an SGLT2 inhibitor, or a rare low renal threshold. Ask about medication first.
• SPECIFIC GRAVITY CHANGES THE MEANING OF EVERY OTHER URINE RESULT. Concentrated urine exaggerates all of them; dilute urine hides them. Read it first -- our library holds hydration status and hydration biomarkers among physically active people directly.
• ⚠️ HYDRATION ALSO DISTORTS BLOOD MARKERS -- haemoglobin, haematocrit, sodium, creatinine and albumin all read high when dehydrated. A urinalysis is a cheap sanity check on the rest of the panel.

Ingredients with evidence in our library

• Water intake, matched to sodium and activitysolid -- 7 rows, 3 human on hydration behaviours and biomarkers in physically active people. ⚠️ More water is not automatically better -- exercise-associated hyponatraemia comes from drinking too much plain water while losing sodium in sweat. Replace what was lost, not simply more. (8 studies in our library, 3 in people)
• Sodium reduction, for protein in urinesolid -- Lowering sodium lowers glomerular pressure and albuminuria -- the same intervention that carries the largest signal on the kidney filtration panel. (8 studies in our library, 3 in people)
• Curcuminemerging -- Our library holds curcumin attenuating proteinuria in patients -- 2 rows, both human. Small, specific, and listed at that weight. (2 studies in our library, 2 in people)
• Vitamin Demerging -- An umbrella review on supplementation in diabetic kidney disease, where albuminuria is the endpoint. (4 studies in our library, 1 in people)
• ⚠️ The library is thin here (190 rows, 41 tagged) and the reason is structuralmixed -- Urinalysis is a screening instrument rather than an intervention target -- studies act on what it detects (kidney function, glucose, infection, hydration), not on the test. The evidence for each of those lives under its own marker, which is where it should be read. (190 studies in our library, 77 in people)

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

Diet patterns with evidence in our library

• DASH dietemerging -- In 50 hypertensive patients with chronic kidney disease, the DASH diet reduced proteinuria and improved renal hemodynamics, suggesting kidney-protective effects alongside its blood-pressure lowering. (2 studies in our library, 1 in people)

Counts are of studies in our citation library that name this marker and involve that diet pattern. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

What people often feel when it runs high

• No symptoms specific to the number -- biological age is a computed summary, not a sensation.
• What tends to travel with an accelerated result: poor sleep, low fitness, high inflammation, poor metabolic health, smoking, and high stress load. Each of those is measurable and modifiable on its own.
• ⚠️ THE MOST IMPORTANT CAVEAT ON THIS MARKER: different clocks disagree with each other, sometimes by many years, on the same sample. They are not measuring one agreed thing. Treat a single result as a conversation starter, not a verdict, and never let it frighten someone.

What people often feel when it runs low

• A younger-than-chronological result is encouraging and, on the same caveat, should not be over-read either.

Patterns it travels in

• THE TREND IS THE ONLY USE. A single epigenetic age is noisy; the same clock on the same person over two or three years says something a one-off cannot. Compare like with like -- never compare across different clocks.
• BIOLOGICAL AGE ACCELERATED + HS-CRP HIGH + FASTING INSULIN HIGH + POOR SLEEP is the actionable version of this result. The composite is downstream of things that each have their own marker and their own evidence base.
• BIOLOGICAL AGE + VO2 MAX / GRIP STRENGTH -- cardiorespiratory fitness and grip strength predict mortality at least as well as any current epigenetic clock, and both are free to measure. Worth saying, because it keeps an expensive test in proportion.
• TELOMERE LENGTH AND METHYLATION CLOCKS ARE NOT THE SAME MEASUREMENT and correlate only weakly. Reporting them as interchangeable is a common error.
• ⚠️ DO NOT BUILD A PLAN ON THIS MARKER. Build it on the markers underneath it -- glucose, insulin, inflammation, lipids, sleep, fitness -- which is where every intervention with real evidence actually acts.

Ingredients with evidence in our library

• Polyphenol-rich dietary patternsemerging -- Our library holds the effect of polyphenols on DNA-methylation-assessed biological age attenuation from the DIRECT-PLUS trial line -- one of very few interventions measured on a methylation clock as a pre-specified outcome rather than found afterwards. (2 studies in our library, 2 in people)
• Mediterranean-pattern eatingsolid -- The dietary pattern with the largest and oldest evidence base for the outcomes biological-age clocks are trying to predict -- PREDIMED-level cardiovascular evidence sits under it. A pattern, not a pill, which is the consistent finding across our whole Labs folder. (387 studies in our library, 200 in people)
• Fermented foods, for the inflammatory halfsolid -- The Stanford RCT (36 healthy adults, 10 weeks, Cell 2021) found a fermented-food diet increased microbial diversity and lowered 19 inflammatory proteins including IL-6, while an equally high-fibre diet did not move diversity in the same window. Inflammation is one of the strongest inputs to every ageing clock. (1 studies in our library, 1 in people)
• Omega-3 (EPA/DHA)emerging -- A randomised controlled trial on omega-3, oxidative stress and leukocyte telomere length. ⚠️ Telomere length is a DIFFERENT measurement from methylation age and the two correlate only weakly -- reporting them as interchangeable is a common error. (2 studies in our library, 1 in people)
• The interventions with the largest evidence are not purchasablesolid -- Not smoking, cardiorespiratory fitness, sleep duration and regularity, maintaining muscle mass, and metabolic health. VO2 max and grip strength predict mortality at least as well as any current epigenetic clock and cost nothing to measure -- worth saying, because it keeps an expensive test in proportion. (387 studies in our library, 200 in people)

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

Movement & practices with evidence in our library

• Meditation / mindfulnesssolid -- In this randomized sub-study of breast cancer survivors, participation in an 8-week mindfulness-based program was associated with stable telomere length over one year relative to a waitlist... (29 studies in our library, 17 in people)
• Yogamixed -- In 96 healthy adults, an uncontrolled single-arm 12-week yoga and meditation program was followed by lower 8-OHdG, ROS, cortisol and IL-6 and higher telomerase activity; telomere length did not... (12 studies in our library, 4 in people)
• Aerobic / endurance (Zone-2)mixed -- An umbrella review and meta-analysis of 22 studies found exercise produced small-to-moderate increases in telomere length (effect size 0.28), with higher-intensity interval training showing... (11 studies in our library, 3 in people)
• Social connection / belongingemerging -- In a meta-analysis of 17 studies, higher social support was not significantly associated with longer telomere length, with confidence intervals indicating mostly small to null effects across the... (9 studies in our library, 2 in people)
• Sunlight / UVBmixed -- In human skin fibroblasts repeatedly exposed to UVB, tetrahydroxy stilbene glucoside at 0.02 to 0.50 mmol per litre raised proliferation and superoxide dismutase and lowered senescent cells,... (6 studies in our library, 4 in people)
• Spiritual / religious practicemixed -- A study of 1,310 middle-aged US adults found that multiple dimensions of religiosity and spirituality were associated with slower biological aging, as measured by two epigenetic clocks, after... (5 studies in our library, 3 in people)
• Resistance / strength trainingmixed -- In a trial of 47 older adults doing resistance training with or without metformin, metformin blunted the exercise-induced gene-expression changes tied to muscle growth but uniquely activated genes... (3 studies in our library, 3 in people)

Counts are of studies in our citation library that name this marker and involve that practice. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

Diet patterns with evidence in our library

• Time-restricted / fastingemerging -- In mice, bi-monthly cycles of a fasting-mimicking diet extended lifespan, lowered visceral fat and promoted hippocampal neurogenesis; in a small pilot trial in adults, three cycles lowered risk... (8 studies in our library, 1 in people)
• Diet quality / healthy patternemerging -- In 679 older Australian adults (57-68 years), three indices of diet quality showed no significant associations with telomere length after adjusting for age, sex, education, smoking, physical... (4 studies in our library, 2 in people)
• Mediterranean dietemerging -- High alcohol consumption was associated with shorter telomere length and accelerated epigenetic aging (GrimAge); Mediterranean diet adherence modulated these associations. (4 studies in our library, 1 in people)

Counts are of studies in our citation library that name this marker and involve that diet pattern. They describe how much evidence exists, not how well anything works, and none of this is medical advice.

What people often feel when it runs high

• Palpitations, tremor, heat intolerance, anxiety, weight loss, loose stools, poor sleep.

What people often feel when it runs low

• The hypothyroid picture -- cold, fatigue, fog, constipation, dry skin, hair thinning, heavy periods, low mood.

Patterns it travels in

• FREE T4 IS THE PRODUCTION NUMBER; FREE T3 IS THE ACTIVATION NUMBER. Free T4 normal with free T3 low is a conversion problem, not a production one -- and that distinction changes what is worth doing entirely.
• FREE T4 LOW + TSH HIGH is overt hypothyroidism. FREE T4 NORMAL + TSH HIGH is subclinical, and is where nutrient status is most worth checking.
• FREE T4 LOW + TSH LOW OR NORMAL points at the pituitary rather than the thyroid, and needs a clinician.
• FREE T4 IS PREFERRED OVER TOTAL T4 because carrier-protein changes -- oral oestrogen, pregnancy, liver disease -- move the total without changing thyroid function.
• ⚠️ TIMING ON REPLACEMENT: draw before the morning levothyroxine dose. A sample taken 2-4 hours after a dose reads artificially high and has caused many unnecessary dose reductions.
• ⚠️ BIOTIN makes free T4 read falsely HIGH -- stop 48-72 hours before.

Ingredients with evidence in our library

• Iodine, as substratemixed -- 13 rows, 4 human. Free T4 is the hormone iodine is literally built into -- four iodine atoms per molecule. U-shaped: too much is as much a problem as too little. (13 studies in our library, 4 in people)
• Ironsolid -- Thyroid peroxidase is a haem enzyme and does the iodination. Our library holds iron deficiency and thyroid function measured directly in pregnancy. (1 studies in our library, 1 in people)
• Seleniumsolid -- 17 rows, 6 human. Protects the gland during synthesis via glutathione peroxidase, and governs what happens to T4 afterwards. (17 studies in our library, 6 in people)
• ⚠️ Separate levothyroxine from iron, calcium, magnesium and coffeesolid -- All of them reduce its absorption. Four hours from minerals, and an hour from food and coffee. This single instruction resolves a meaningful share of 'my dose isn't working'. (141 studies in our library, 27 in people)

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

What people often feel when it runs high

• The overactive picture -- palpitations, tremor, heat intolerance, anxiety, weight loss, loose stools, poor sleep.

What people often feel when it runs low

• The underactive picture -- cold, fatigue, fog, constipation, dry skin, hair thinning, heavy periods.

Patterns it travels in

• ⚠️ TOTAL T4 IS THE WEAKER TEST AND FREE T4 IS THE ONE TO ORDER. Total T4 measures hormone bound to carrier proteins plus the tiny free fraction that is actually active -- so anything that changes carrier protein levels changes the total without changing thyroid function at all.
• TOTAL T4 HIGH + NORMAL FREE T4 = raised thyroxine-binding globulin, not thyroid disease. Caused by oral oestrogen (the pill, oral HRT), pregnancy, and liver disease.
• TOTAL T4 LOW + NORMAL FREE T4 = low binding globulin -- androgens, steroids, nephrotic syndrome, severe illness.
• TOTAL T4 retains a use in monitoring where free-hormone assays are unreliable, and in some pregnancy protocols where the reference ranges shift predictably.

Ingredients with evidence in our library

• ⚠️ Our library holds almost nothing on total T4 specifically -- 11 rows.mixed -- That is expected rather than alarming: the research literature moved to free hormone measurement decades ago. The nutrient evidence that matters (selenium, iodine, zinc, iron) sits under free T4, free T3 and TSH, which is where it should be read. (11 studies in our library, 4 in people)

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

What people often feel when it runs high

• Palpitations, tremor, heat intolerance, anxiety, weight loss, loose stools.

What people often feel when it runs low

• The hypothyroid picture EVEN WHEN TSH READS NORMAL -- cold, flat, foggy, constipated, dry-skinned, losing hair.
• Free T3 tracks how someone FEELS better than TSH does, because T3 is the active hormone the tissues actually use.
• A distinct pattern in dieters and endurance athletes: free T3 falls first when energy availability drops. That is adaptive down-regulation, not disease, and it corrects with food rather than iodine.

Patterns it travels in

• FREE T4 NORMAL + FREE T3 LOW IS A CONVERSION QUESTION. Selenium, zinc and iron are the cofactors for that step -- which is exactly what this panel's 17 selenium rows and 5 zinc rows are about. Cortisol and inflammation both suppress the same step.
• FREE T3 LOW + REVERSE T3 HIGH + CORTISOL RAISED is the stress and illness pattern -- T4 deliberately routed to the inactive form.
• FREE T3 LOW + FERRITIN LOW -- iron is a conversion cofactor as well as a synthesis one.
• IODINE + SELENIUM + ZINC MEASURED TOGETHER -- our library holds a study assessing exactly this joint impact on third-trimester thyroid function.
• ⚠️ FREE T3 IS THE MARKER MOST OFTEN LEFT OFF A PANEL AND MOST OFTEN THE ONE THAT EXPLAINS THE SYMPTOMS.
• ⚠️ FREE T3 IS THE LEAST RELIABLE OF THE THYROID ASSAYS technically -- interpret a borderline value alongside symptoms rather than as a precise number.

Ingredients with evidence in our library

• Seleniumsolid -- 17 rows, 6 human -- the largest signal on this marker. The deiodinases that convert storage T4 into active T3 are selenoproteins. This is the most mechanistically direct nutrient-to-marker link in the whole thyroid group. (17 studies in our library, 6 in people)
• Zincsolid -- 5 rows, 3 human. Required for deiodinase activity and receptor binding; assessed jointly with iodine and selenium. (5 studies in our library, 3 in people)
• Ironsolid -- Haem-dependent thyroid peroxidase, measured on the iron-deficiency-and-thyroid-function relationship directly. (1 studies in our library, 1 in people)
• Probiotics and synbioticsemerging -- 2 rows -- oral supplementation moved thyroid function in adults. A meaningful fraction of T4-to-T3 conversion happens via gut bacterial sulfatases, which is the mechanism behind an otherwise surprising result. (2 studies in our library, 1 in people)
• Adequate energy intakesolid -- Free T3 is the marker that falls first in restriction and over-training. Where that is the cause, more food raises it and no supplement will. (141 studies in our library, 27 in people)

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

What people often feel when it runs high

• Palpitations, tremor, heat intolerance, anxiety, weight loss.

What people often feel when it runs low

• Cold, fatigue, fog, low mood, constipation, and the whole low-T3 picture -- which frequently appears with a completely normal TSH.

Patterns it travels in

• ⚠️ SAME CARRIER-PROTEIN PROBLEM AS TOTAL T4 -- free T3 is the better test for the same reason.
• TOTAL T3 has one genuine advantage: in some assays free T3 is technically unreliable, and total T3 remains useful for confirming hyperthyroidism, particularly T3-toxicosis where T4 is normal and T3 alone is raised.
• TOTAL T3 LOW in acute illness or prolonged energy restriction is non-thyroidal illness -- deliberate down-regulation, not disease. Treating it as hypothyroidism is a real and common error.

Ingredients with evidence in our library

• ⚠️ 6 rows in the entire approved library.contested -- The thinnest count of any marker measured in this whole exercise, and it reflects the assay's status rather than the biology. Read the conversion evidence -- selenium, zinc, iron, cortisol -- under free T3. (6 studies in our library, 2 in people)

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.

What people often feel when it runs high

• The claim is that high reverse T3 blocks active T3 and causes hypothyroid symptoms with normal standard labs -- cold, fatigue, fog, weight gain.
• ⚠️ THIS IS CONTESTED, AND THE PAGE SHOULD SAY SO PLAINLY. Reverse T3 rises reliably in acute illness, starvation, prolonged calorie restriction, over-training, and after surgery -- it is a MARKER of the body down-regulating deliberately. Mainstream endocrinology does not accept it as a treatable target, and there is no outcome trial showing that lowering it helps anyone.

What people often feel when it runs low

• No recognised significance.

Patterns it travels in

• REVERSE T3 HIGH + FREE T3 LOW + TSH NORMAL is the non-thyroidal illness / low-T3 syndrome pattern. It is real physiology. What is contested is whether it should be treated, and the honest answer is that the evidence does not support treating it as thyroid disease.
• REVERSE T3 HIGH + CORTISOL HIGH -- cortisol drives T4 down the reverse-T3 route. This is the mechanism, and it points at load, sleep and energy availability rather than at the thyroid.
• REVERSE T3 HIGH + FERRITIN LOW + prolonged dieting or high training load -- the commonest real-world cause combination, and the one that responds to more food and more rest.
• ⚠️ THE FREE T3 : REVERSE T3 RATIO is popular in functional medicine and has no agreed reference range, no assay standardisation, and no outcome evidence. Presenting it as a validated number would be misleading.

Ingredients with evidence in our library

• ⚠️ 10 rows, 3 tagged, none human-typed -- and the honest position is that nothing here is established.contested -- Selenium and iodine appear because they belong to the deiodinase enzymes that produce reverse T3, but no trial in our library shows a supplement lowering reverse T3 to anyone's benefit. Claiming otherwise would be inventing evidence. (10 studies in our library, 4 in people)
• Adequate energy intake and recoveryemerging -- The mechanism points here rather than at a bottle: reverse T3 rises when the body decides to spend less. More food, more sleep, less training load. It is unglamorous and it is what the physiology actually says.

Counts are of studies held in our own citation library that name this marker and carry that ingredient tag. They describe how much evidence exists, not how well anything works, and none of this is medical advice or a claim to treat any condition.