Calcium is a mineral that, when combined with Vitamin D, may reduce the risk of Osteoporosis. Our Calcium plus D3 provides you with 600 mg of absorbable calcium, as Calcium Carbonate, and 20 mcg (800 IU) of Vitamin D3 per serving to better support bone health. Adequate calcium and vitamin D as part of a healthful diet, along with physical activity, may reduce the risk of Osteoporosis in later life.