Calcium and Magnesium with Vitamin D is necessary for the development of strong bones and teeth, also prevents muscle cramping, risk of colon cancer, maintain regular heart beat, protects against osteoporosis and helps relax the central nervous system. Calcium, Magnesium and Vitamin D combines the optimum potency of key ingredients with a blend of supportive herbs to restore and maintain the bodys natural state of balance, Vitamin D helps is absorption.