Calcium is needed to develop & maintain healthy bones & teeth, & is an important factor in reducing the rate of age-related bone loss (one of the risk factors for osteoporosis). It is also essential for cellular growth, blood clotting, nerve impulse transmission & muscular function. Calcium can compete with magnesium for absorption, so supplemental magnesium is added. Magnesium, in association with calcium, is important for bone structure & strength, & for keeping calcium soluble (helping to prevent the formation of kidney stones). It is also needed for muscle relaxation & is essential for growth. Vitamin D is needed for calcium absorption, & its functions include growth & maintenance of healthy bones & teeth. Contains betaine hydrochloride to aid mineral digestion & absorption. Suitable for vegetarians