Vitamin K2 (Menaquinone): K vitamins are a group of fat-soluble vitamins. The two most important forms found in food are vitamin K1 (Phylloquinone) and Vitamin K2 (Menaquinone). Supplemental Vitamin K2 exists in several forms, but the most common ones are the menaquinone-4 (MK-4) and menaquinone-7 (MK-7). MK-4 is normally synthesized from all types of vitamin K 1 in certain animal tissues. MK-7 and other long-chain Menaquinones are different from MK-4 in that they are not produced by human tissue, but are generated
