What it is
A fat-soluble vitamin in the menaquinone family. MK-4 and MK-7 are the most common subtypes in supplements.
How it works
Serves as a cofactor for gamma-glutamyl carboxylase, which activates vitamin K-dependent proteins such as osteocalcin and matrix Gla-protein, involved in bone mineralization and vascular calcium handling.
Where it's used
Used as a dietary supplement, often paired with vitamin D, for bone and cardiovascular support.
FDA-approved use
Regulated as a dietary supplement.
Tracking it
Vitamin K2 is oral, which makes consistency the whole game — a simple daily check-off with a reminder beats memory every time. with a half-life of about 3 days (72 h), a dose log also lets a tracker model the relative amount still in your system between doses.
Source
Public reference
Not medical advice. This page is an educational summary compiled from public
sources for people who log what they take. It is not a recommendation to use
Vitamin K2, a dosing guide, or a substitute for a clinician.
How we source →
Last reviewed 2026-06-11