Calcium plays a very important role in the body. It is necessary for normal functioning of bone, nerve cells, muscle, and other vital organs and the regulatory system of the body. If there is not enough calcium in the blood, then the body will take Calcium from bones, thereby weakening bones and triggers different types of bone disorder. Vitamin D3 helps the body to absorb Calcium. Having the right amounts of Calcium and Vitamin D3 is important for building and keeping strong bones and healthy muscles.