Calcium is a major constituent of bones and teeth and is important for nerve function, muscle contraction and cardiovascular health. Calcium helps reduce the risk of osteoporosis in some individuals. Magnesium is one of the prime regulators of calcium flow within cells. Magnesium also helps strengthen teeth and aids bone growth. Zinc is a cofactor of more than 200 enzymes, including those involved in the production of DNA and RNA. Zinc is necessary for normal metabolism, immune health and cell function.