Get your daily calcium and magnesium in one convenient supplement! Featuring natural calcium from oyster shell. What is Vitacost Calcium & Magnesium? . Vitacost Calcium & Magnesium is a combination formula providing half of the Daily Value for calcium and 63 percent for magnesium in a single convenient tablet. . Unlike other calcium supplements which may contain synthetic calcium this formula features natural calcium from oyster shell. Oyster shell is a source of calcium carbonate a form of calcium commonly used in supplements but often derived from limestone or chalk. . How does Vitacost Calcium & Magnesium support health? Calcium is an essential ingredient of bone that must constantly be replenished*. Calcium is known to support the proper function of nerves and muscle*. Adequate calcium intake throughout life as part of a well-balanced diet may reduce the risk of osteoporosis by slowing the rate of bone loss for people with a family history of the disease post-menopausal women and elderly men and women. Magnesium contributes to calcium absorption*. Magnesium helps build strong bones by converting vitamin D to its active form and setting in motion key enzymes that stimulate bone cells*. Magnesium helps maintain normal muscle and nerve function*. Why choose Vitacost Calcium & Magnesium? Provides a combination of calcium and magnesium in one convenient formula. Features calcium from a natural source: oyster shell. Supplies 500 mg of calcium and 250 mg of magnesium per tablet. Great value! About Vitacost. Vitacost nutritional products are manufactured to high standards of quality efficacy and safety. Each Vitacost product meets or exceeds the standards and requirements set forth in the FDA’s Code of Federal Regulation (21 CFR 111) Current Good Manufacturing Practices (CGMP). . . *These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose treat cure or prevent any disease.