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Re: edit Going to start painting my groin area with iodine by just thinking ..... Iodine Supplementation Support by VWT Team

Date:   4/30/2012 2:57:42 PM ( 7 years ago ago)
Hits:   4,280

Stephan Guyenet talks about them both in his blog --

Wednesday, March 11, 2009

Are the MK-4 and MK-7 Forms of Vitamin K2 Equivalent?

The vitamin K found in food can be divided into two categories: phylloquinone
(K1) and menaquinone (K2). K1 is concentrated in leafy greens and other green vegetables. K2 can be further subdivided into menaquinone-4 through -14. The number represents the length of the side chain attached to the napthoquinone ring. Menaquinone-"X" can be abbreviated MK-"X". MK-4 is the type synthesized by animals for their own use from K1 (and from MK-7 in rats). MK-5 through MK-14 are synthesized by bacteria. MK-7 in particular is made in large amounts by the bacterium Bacillus subtilis that ferments the infamous Japanese condiment natto. It's also sold as a supplement. Animals concentrate MK-4 in a number of organs, with smaller amounts of K1. Certain organs such as the brain, pancreas and salivary gland show an overwhelming preference for MK-4 over K1 in rodents and humans. The liver is a notable exception; in some animals, including humans, it concentrates longer menaquinones to a greater extent than MK-4 if they're present in the diet.



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