Calcium is one of the most important of all minerals, and perhaps the one that has the most direct impact on our good health. It is vital to growing strong bones and teeth, and it is essential for numerous corporal functions such as heartbeat, muscular contraction and blood coagulation. It also participates as a regulator of the nervous system and metabolizes iron in the body. Calcium supplementation is crucial during childhood and adolescence to support bone development, during menopause to fight bone loss and the risk of osteoporosis, and during pregnancy for the formation and development of the baby and the mothers health. Vitamin D is most famous for its contribution to joint and bone health by helping the body absorb Calcium. It has been shown that people who take in enough Vitamin D are less likely to suffer from osteoporosis and joint pain. This vitamin can also slow the affects of arthritis and lessen back pain in many individuals. Studies have shown that Vitamin D may also help prevent certain types of cancer.