Calcium is the primary mineral responsible for strong bones and Magnesium plays an essential role in proper bone mineralization. Bone health can be dependent on many factors including heredity, diet, exercise and lifestyle. The body also uses Calcium for proper muscle contraction and nerve function - and obtains this Calcium mainly from the bones. Because the body can not product Calcium, a balanced diet, regular exercise, healthy lifestyle choices and adequate intake of Calcium and Vitamin D can play a roll in maintaining optimal bone health.