Vitamin K2 consists of 10 different vitamin subtypes (menaquinones) that are designated as MK-4 through MK-14.
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Vitamin K2 consists of 10 different vitamin subtypes (menaquinones) that are designated as MK-4 through MK-14. Small amounts of MK-4 can be consumed from meat and cheese as well as synthesized from vitamin K1 by intestinal bacteria; MK-7 is found in natto, a fermented soy food. Because good dietary sources of K2 are limited, and because conversion of K1 to K2 in the intestine can be insufficient, poor vitamin K2 status is common and can contribute to weak bones, cardiovascular disease by hardening of the arteries, and possibly certain cancers. Vitamin K2 helps to prevent vascular calcification and improves bone health and strength.