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Vitamin K, also known as coagulation vitamin, belongs to a kind of vitamin and has the biological activity of chlorophyllin quinone. It was first discovered and extracted from animal liver and sesame oil by Danish chemist Damm in 1929. It was named "vitamin K" in 1934, which comes from the German word "coagulation" - Koagulation. In 1939, Doyce from the United States isolated vitamin K and determined its chemical formula and structure. In 1943, they won the Nobel Prize in physiology and medicine.

Vitamin K includes K1, K2, K3, K4 and other forms, among which K1 and K2 exist naturally and belong to fat soluble vitamins; K3 and K4 are synthetic and water-soluble vitamins. The chemical properties of the four kinds of vitamin K are relatively stable and acid and heat resistant. There is little loss in normal cooking, but they are sensitive to light and are easy to be decomposed by alkali and ultraviolet light.

Vitamin K2 (MK-7) is a type of vitamin K2, that is, seven isoprene units on the side chain of vitamin K2. It is a fat-soluble vitamin and one of the indispensable vitamins in the human body. It is also known as MK-7, menadione-7 and vitamin K2. CAS NO.2124-57-4, molecular formula C46H64O2, molecular mass 649.00.