Vitamin K2

Also called: menaquinone, mk-7, k2

Vitamin K helps blood clot and builds bone proteins. K1 comes from leafy greens; K2 from fermented foods and animal foods.

Why people take it: Bone health, often taken together with vitamin D3.
What the evidence says: Research on whether K2 prevents fractures or heart disease is limited and mixed.
Be careful: If you take warfarin, do not start or stop vitamin K without your doctor, as it changes how the medicine works.
In food: K1: spinach, methi and other leafy greens. K2: natto, cheese, eggs.

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Vitamin K helps blood clot and builds bone proteins. K1 comes from leafy greens; K2 from fermented foods and animal foods.

Bone health, often taken together with vitamin D3.

Research on whether K2 prevents fractures or heart disease is limited and mixed.

If you take warfarin, do not start or stop vitamin K without your doctor, as it changes how the medicine works.

Last reviewed 31 October 2026. Written by Satya Babu.