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Our Members Asked:
What is the difference between forms of vitamin K2?
Reviewed and edited by Tod Cooperman, M.D.
Initially Posted: 03/13/2012
| Last Updated: 10/24/2019

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.Join today to unlock all member benefits including full access to all CL Answers and over 1,300 reviews.
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