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Our Members Asked:

What is the difference between forms of vitamin K2?

Medically reviewed and edited by Tod Cooperman, M.D.

Last Updated: 10/24/2019 | Initially Posted: 03/13/2012

Vitamin K: MK-4 vs MK-7 -- vitamin K tablets in the shape of the letter 'K'

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Answer:

Two forms of vitamin K2 are typically found in supplements: MK-4 (synthetic) and MK-7 (natural, from natto). There are significant differences between them: in paticular, MK-7 has a longer half-life, so a smaller dose can be used. Two newer forms of MK-7 are available that are synthetic. Get the details in the Review of Vitamin K Supplements, which includes our tests and comparisons of products containing both forms of K2 as well as vitamin K1.

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