Vitamin K - Wikipedia, the free encyclopedia
Vitamin K 2 (menaquinone) includes several subtypes. The two subtypes most studied are menaquinone-4 (menatetrenone, MK-4) and menaquinone-7 (MK-7). Chemical structure The three synthetic forms of vitamin K are vitamins K 3 (Menadione), K 4, and K 5, whic...