Calcium provides the building blocks that help keep bones and teeth strong and healthy.* It also supports the health of the musculoskeletal and nervous systems.* Magnesium helps to regulate calcium transport and stimulates the secretion of calcitonin, a hormone that aids in the influx of calcium into bone.* Vitamin D is required to promote calcium absorption, which helps to maintain healthy bones and teeth.* Vitamin D also supports a healthy immune system.* This formulation provides Vitamin D3 for daily supplementation. Adequate Calcium and Vitamin D as part of a healthful diet, along with physical activity, may reduce the risk of osteoporosis in later life.