Usually naturally derived from fermented foods like natto or chickpeas .
Found naturally in animal products like grass-fed butter and organ meats .
Widely considered the gold standard for supplementation .
It has a long half-life of roughly 72 hours , remaining active in the bloodstream for several days .
2. Purity and Bioavailability: What to Look for on the Label MK4 or MK7, Which is Better for Bones? - NBI Health
The most critical decision when buying Vitamin K2 is choosing the correct subtype. While both forms activate proteins like osteocalcin (for bones) and matrix GLA protein (for arteries), they behave differently in your system .