Vitamin K2 (MK-7) 100 mcg

Vitamin K takes its letter from the German Koagulation, the property Henrik Dam noticed in the 1930s when chickens on a fat-free diet began to bleed. For fifty years that was thought to be the whole story. It was not. The same vitamin activates a small family of proteins outside the clotting cascade — osteocalcin in bone, matrix Gla protein in the vessel wall — and it does so by a single chemical act: carboxylating specific glutamate residues so those proteins can bind calcium.

Uncarboxylated, they cannot. This is why vitamin K sits quietly behind the question of where dietary calcium actually ends up.

K2 supplies 100 mcg of natural menaquinone-7, the long-chain form produced by fermentation and found in traditional foods such as natto. MK-7 matters because of its half-life: measured in days rather than the few hours of K1, which means a single daily dose maintains steady circulating levels. It is used to support normal bone mineralization and healthy arterial and cardiovascular function.

If you supplement vitamin D or calcium, K2 belongs in the same conversation.

Available in 60 softgels.

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.