There are 3 types of vitamin K: K1 (phytomenadione) is obtained from food, K2 (menaquinone) is produced by intestinal bacteria and K3 (menadione) is a synthetic form.
Vitamin K is important for blood coagulation and is essential for the synthesis of blood coagulation proteins in the liver. Vitamin K is also known to help maintain healthy bones. This is due to its ability to activate calcitonin, a hormone produced by humans, which in turn helps absorb calcium in the bone. Absorption of vitamin K occurs mainly in the upper part of the small intestine through bile or bile salts and pancreatic juices and is then transported to the liver.