Calcium is the most abundant mineral in the human body. Of the two to three pounds of calcium contained in the average body, 99% is located in the bones and teeth. An adequate daily intake of calcium is not only needed to form healthy bones and teeth, but also in preventing colon and rectal cancers, high blood pressure, and even preventing premenstrual syndrome. Calcium also plays an important role in weight loss, muscular contractions, vision, assisting with regulating heartbeat, transmitting nerve impulses, blood clotting, and helping to maintain the walls of blood vessels.