Vitamin K

Key facts Vitamin K is important because it helps the liver make proteins that allow blood to clot. Vitamin K deficiency is rare — adults usually have enough vitamin K because normal bacteria in the gut produce it, and it is also in the fat of many commonly available foods. Not having enough vitamin K in the body can make you bruise or bleed more easily than usual. A blood test can confirm vitamin K deficiency. If you are deficient in vitamin K, your doctor will prescribe vitamin K supplements. Why is vitamin K important? Vitamin K is important because