Calcium provides the building blocks that help keep bones and teeth strong and healthy.* It also supports the musculoskeletal and nervous systems, and is involved with heartbeat regulation.* Magnesium helps to regulate calcium transport and stimulates the secretion of calcitonin, a hormone that aids in the influx of calcium into bone.* It plays an important role in protein formation and healthy muscle function.* This formulation contains the highly absorbable citrate form of calcium.* Adequate calcium throughout life, as part of a well-balanced diet, may reduce the risk of osteoporosis.