Vitamin K
Vitamin K is a group of vitamins that are fat-soluble. They play an important role in blood clotting, bone metabolism and in regulating blood calcium levels.
Vitamin K can be further divided into K1 and K2. Vitamin K1 or phylloquinone comes from plants. Vitamin K2 is found mainly in animal products and some fermented foods. Without vitamin K, the body cannot produce prothrombin, which is important in blood clotting.