The Key Vitamin for Bone Health that Most People Don't Know About  - Vitamin K
http://articles.mercola.com/sites/articles/archive/2009/06/13/The-Key-Vitamin-for-Bone-Health-that-Most-People-Dont-Know-About.aspx

Vitamin K has been linked to bone, heart and even prostate health, but joint health and cartilage could also be affected by this little-known vitamin. In the podcast linked below, Stephen Daniells talks to Professor Cees Vermeer about raising awareness on vitamin K.

Professor Vermeer said he could imagine vitamin K benefits extending beyond cardiovascular and bone health, to joint health. He stated:

“All diseases of the cartilage -- I could imagine that these would benefit from vitamin K2.”

Awareness of vitamin K from green vegetables, the fermented soy product natto and cheese is increasing, although many are still unaware of the benefits and sources of the vitamin.