calcium - "a mineral that helps build stronger, denser bones early in life and keeps bones strong and healthy later in life. "Approximately 99 percent of the body's calcium is stored in the bones and teeth. The rest of the calcium in the body has other important uses, such as ... neurotransmitter release, and muscle contraction ... the electrical conduction system of the heart, ... Long-term calcium deficiency can lead to rickets and poor blood clotting and in case of a menopausal woman, it can lead to osteoporosis, in which the bone deteriorates and there is an increased risk of fracture ... Dairy products, such as milk and cheese, are a well-known source of calcium" (See Wikipedia)