At around the age of 30, our bone mass begins to decline. Support healthy bones with calcium hydroxyapatite, made from a form of calcium that gives bones their strength and rigidity. Bones consist of living cells embedded in a mineralized organic matrix. The more bone mass, the stronger the bone. This form of calcium contains phosphorus in the appropriate ratio for bone building. The vitamin D supports the body's assimilation of these important minerals. Adequate calcium and vitamin D throughout life, as part of a well- balanced diet and physical activity, may reduce the risk of osteoporosis in later life.