Calcium Advance contains calcium citrate which is readily absorbed and Vitamin D3 which daily support for bones & immune system Calcium supports strong bones & teeth, & Vitamin D3 is a potent, active form of vitamin D that helps your body absorb Calcium. Calcium is essential to bone health It is the most abundant mineral in the body and helps build and support strong bones Adequate calcium and vitamin D3 throughout life, as part of a well-balanced diet, may reduce the risk of osteoporosis Nature Made Calcium is an excellent way to make sure your body is receiving enough of this essential mineral.