Calcium is the primary mineral responsible for strong bones. The body also uses Calcium for proper muscle contraction, nerve function and heart function. Vitamin D assists in Calcium absorption and maintaining a healthy immune system. Because the body cannot produce Calcium, a balanced diet, regular exercise, healthy lifestyle choices and adequate intake of Calcium and Vitamin D can play a role in maintaining optimal bone health. Adequate Calcium and Vitamin D throughout life, as part of a well-balanced diet, may reduce the risk of osteoporosis.