Vitamin K

Vitamin K is not just one thing, but actually a small group of vitamins used for different roles in the body.  Deficiency of Vitamin K can lead to bleeding abnormalities as Vitamin K1 is involved in clotting.  Vitamin K also has a role in bone health.
Vitamin K is found in green leafy vegetables and beef liver.  Chlorophyll is the compound in plants that make them green and provides Vitamin K.
Vitamin K2 can be found by itself or as an ingredient many bone health formulas.