Vitamin K2
Research, explainedVitamin K matters for blood clotting. That does not mean every D3 product needs K2 or that K2 prevents vascular calcification.
What was studied
A randomized trial in 365 men with aortic valve calcification found no significant effect of MK-7 plus vitamin D on calcification progression after two years.
What remains uncertain
A biomarker is not proof of fewer heart attacks. Patient-group findings do not generalize to everyone. Vitamin K interacts with vitamin K antagonists such as warfarin.
Understanding the form
MK-4 and MK-7 are different forms. MK-7's longer persistence alone does not prove better clinical outcomes.
Reviewed: 2026-09-05 · Ingredient research does not test this product or its batch.