Why is vitamin d necessary?

Calcium absorption: Vitamin d is necessary for calcium and phosphorus absorption by the intestine. This helps maintain normal bone. It may also be important in other functions of the body but this is controversial.

Many benefits!: Vit d is necessary to absorb calcium. Low vit d can cause fatigue, muscle pain/ weakness, headaches, depression and increases risk of infections, heart disease, cancer and risk of dying! see http://www.Drfranklipman.Com/symptoms-diseases-associated-with-vitamin-d-deficiency and http://articles.Mercola.Com/sites/articles/archive/2008/11/01/vitamin-d-is-a-key-player-in-your-overall-health.Aspx.

For Bones and more: VitaminD is necessary for proper absorption of calcium which is essential for development of bones in children&maintainance of good bones and prevent Osteoporosis in adults.Besides that we are finding now that adequate amount of VitD in blood is needed to have strong immune system&prevention of other medical conditions like cardiovascular diseases and cancers.In children deficiency causes Ricketts