There are two categories of vitamin K: phylloquinone and menaquinone. Phylloquinone is made by plants, while menaquinone is made by bacteria. Phylloquinone accounts for about 90% of the vitamin K intake in humans.

Vitamin K is essential to the body for many reasons. Vitamin K helps prevent postmenopausal bone loss and certain cancers. Vitamin K also helps the blood clot and prevents the body from bruising easily.

A vitamin K deficiency can result in weak bones, which could lead to possible fractures. A vitamin K deficiency can also result in excessive bleeding or calcification of heart valves and blood vessels.