Ingredient framework; direct source links are available in the studies library when published.
How it works
Transform -- enzymatic cofactor for gamma-carboxylation of vitamin K-dependent proteins (osteocalcin, matrix Gla-protein)
Build -- activates osteocalcin, enabling calcium incorporation into bone matrix during bone formation
Maintain -- activated matrix Gla-protein is proposed to inhibit ectopic calcium deposition in arterial tissue, supporting vascular tissue upkeep
Exchange -- MK-7's longer isoprenoid side chain gives it a much longer circulating half-life than MK-4 or vitamin K1 (phylloquinone), allowing it to accumulate steady tissue levels with once-daily dosing -- the pharmacokinetic reason MK-7 is favored in maintenance-dose supplements while MK-4's shorter half-life is why Japanese clinical trials use gram-per-day-range doses
Maintain -- MK-4 specifically (not MK-7) is also synthesized locally in a few tissues -- including brain, pancreas, and salivary glands -- from dietary precursors via a conversion enzyme (UBIAD1), suggesting a tissue-specific local role distinct from the liver-made clotting-factor pool
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
K2 activates osteocalcin (directing calcium into bone) and matrix Gla-protein (keeping calcium out of arterial walls) -- the same activation chemistry, two different Gla-proteins, which is why it is discussed alongside both bone-formula and cardiovascular-adjacent research.
The science on Vitamin K2 (MK-4 and MK-7)
Powered by CellWellBalanced by design -- we show supporting and contradicting findings. Search all studies
Related reading
Articles that go deeper on Vitamin K2 (MK-4 and MK-7).
- NutrientDoes Vitamin K2 Actually Decide Where Calcium Goes in Your Body?Vitamin K's reputation begins and ends with blood clotting for most people. A second, separate pathway activates proteins involved in directing calcium -- a real mechanism, well described at the molecular level, worth understanding on its own terms without reaching past what it actually shows.6 min read
- PillarCardiac Is the Number One Killer. Here Is What the Evidence Says to Do.Cardiovascular disease is the leading cause of death, and the advice is always the same: watch your cholesterol, watch your ApoB. But plaque starts in a damaged vessel wall, and the wall runs on potassium, magnesium, vitamin E, vitamin C and the minerals most adults are short of.11 min read