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Calcium is a mineral found in many foods. The body needs calcium to maintain strong bones and to carry out many important functions. Almost all calcium is stored in bones and teeth, where it supports their structure and hardness.The body also needs calcium for muscles to move and for nerves to carry messages between the brain and every body part.In addition, calcium is used to help blood vessels move blood throughout the body and to help release hormones and enzymes that affect almost every function in the human body.alcium is found in many foods. You can get recommended amounts of calcium by eating a variety of foods, including the following: 1  Milk, yogurt, and cheese are the main food sources of calcium for the majority of people in the United States.
Calcium also helps regulate cell permeability. It is also very alkaline-forming and critical for the maintenance of acid-base balance of the blood and the body tissues. Calcium is involved in the secretion of male and female hormones, cell division and the water balance of the body.It also stabilizes cell membranes, helps muscles relax, and slows nerve transmission and the heart rate. Calcium also helps prevent fluid loss from cells and from the blood.n this case, calcium becomes biounavailable. That is, an excess occurs in the tissues but it is not available to the body. It becomes essentially a toxic mineral, causing calcium deposits in the joints, arteries, kidneys, brain and elsewhere.