Ingredient framework; direct source links are available in the studies library when published.
How it works
Transform -- as thiamine pyrophosphate, cofactor for pyruvate dehydrogenase and alpha-ketoglutarate dehydrogenase in the citric-acid cycle, and for transketolase in the pentose phosphate pathway
Maintain -- supports peripheral nerve conduction and myelin maintenance
Process -- thiamine-dependent transketolase in the pentose phosphate pathway supplies NADPH and ribose-5-phosphate needed for neuronal antioxidant defense and nucleotide synthesis -- deficiency (as in Wernicke's) preferentially damages high-metabolic-demand brain regions, the mechanistic reason thiamine status is tied to cognitive processing capacity
Exchange -- actively transported across the gut and the blood-brain barrier via dedicated thiamine transporters (THTR-1, THTR-2), a system alcohol use can impair -- part of why alcohol use disorder precipitates thiamine deficiency
Form matters
The same nutrient can be made in very different forms -- and a study done on one form does not automatically apply to another. Methylcobalamin is not cyanocobalamin; magnesium glycinate is not magnesium oxide; a whole-food extract is not the synthetic isolate that was studied. Two things decide whether what is in the bottle behaves like the research: the exact form, and independent lab verification (a Certificate of Analysis) that the form and dose on the label are truly what is inside. Without a COA, you are trusting a label, not the science.
Across your systems
B1, B2, B3, and B5 all converge on the same job -- each becomes a coenzyme (TPP, FAD, NAD+, CoA) that the citric acid cycle and electron transport chain require to turn food into ATP, which is why a B-complex is formulated as a set rather than any single B vitamin in isolation.
The science on Vitamin B1
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