Calcium is a mineral that plays a very important role for the body, is the main constituent of bones and teeth (99% is in bones and teeth), only 1% is in the blood, but participates in the Metabolic effects and many important functions of the body such as cell activity, blood clotting, regulating muscle contraction including the heart muscle, helping to absorb vitamin B12 in the intestine, supporting the distribution, Receiving and transmitting nerve signals... Calcium is essential for human life, but the body cannot synthesize itself, but needs to be introduced from the outside through food.