Calcium is the most abundant mineral in the body, and 99% of it is stored in the bones and teeth, where it helps to provide structural support. During childhood and adolescence, calcium helps to build strong, dense bones, and later in life, calcium helps to maintain bone health. But calcium doesn’t work alone – your body needs vitamin D to help absorb the calcium you consume. Adequate calcium and vitamin D intake as part of a healthful diet, along with physical activity, may reduce the risk of osteoporosis in later life. Magnesium also contributes to strong bones, and supplementation with this important mineral can help support calcium metabolism.