Cal 400mg + Vits A & DCalcium is needed to develop and maintain healthy bones and teeth. It is also essential for cellular growth, blood clotting, nerve impulses and muscular functions. Vitamin D often called the sunlight vitamin is produced in the body in response to sunlight. Vitamin A is needed in the maintenance of healthy teeth, and is often used to support the immune system, eyes and skin. Vitamin D is used for immune support, osteoporosis, coeliac disease and when used with calcium, helps with the absorption of potassium and phosphorus, which again helps to maintain healthy bones and teeth.