Of the approximately 1,000 g of calcium in the average 70 kg adult body, almost 98% is found in bone, 1% in teeth, and the rest is found in blood, extracellular fluids, and within cells where it is a co-factor for a number of enzymes. Calcium promotes blood clotting by activating the protein fibrin, and along with magnesium helps to regulate the heart beat, muscle tone, muscle contraction and nerve conduction... Full Text