The mineral Calcium is most commonly associated with healthy teeth and bones. It makes up a big chunk of the structure of teeth and bones and allows the body to move normally. Calcium is also needed to keep the heart, nerves and muscles functioning properly. It can also help in regulating normal heart rhythms, improving nerve function, helping muscles contract and combating blood clotting. A deficit in calcium could make your muscles cramp, your heartbeat irregular and it could also make you more prone to bone-related injury.