You have more calcium in your body than any other mineral. Calcium has many very important jobs. The body stores more than 99 percent of its calcium in the bones and teeth to increase and maintain strength. The rest is throughout the body in blood, muscle and the fluid between cells. Calcium is necessary to help muscles and blood vessels contract and expand, to secrete hormones and enzymes and to send messages through the nervous system. Calcium is necessary to stabilize or allow for optimal activity of a number of proteins and enzymes. The binding of calcium ions is required for the activation of the seven "vitamin K-dependent" clotting factors in the coagulation cascade. This helps stop bleeding, without this your body couldn't stop bleeding.