Vitamin K is an important vitamin for promoting normal blood coagulation and bone growth. Vitamin K is the essential substance in the synthesis of four kinds of blood clotting proteins (prothrombin, factor VII, anti-hemophilia factor and stuart factor) in the liver. The human body has little vitamin K, but it can maintain normal function of blood coagulation, reduce heavy bleeding in the physiological period, and prevent internal bleeding and hemorrhoids. The person with frequent nosebleed should take in more vitamin K from the natural foods.