Nature Made Calcium Magnesium and Zinc is a calcium supplement scientifically formulated to provide bone support nutrients as well as those that aid in nerve, muscle and metabolic reactions. † Adequate calcium, along with a well-balanced diet, plays an integral role in supporting bone health and may help reduce risk of osteoporosis later in life. Adequate calcium is also important for teens and young adults and post-menopausal women. † Magnesium helps support nerve, muscle, and metabolic functions. † Each tablet of Nature Made Calcium, Magnesium & Zinc provides 333 mg of calcium, 133 mg of magnesium, and 5 mg of zinc as well as 5 mcg (200 IU) of vitamin D.