Triple A Cal-FD Capsule has a balanced mix of Calcium and Cholecalciferol (vitamin D). Calcium plays a very important role in the body. It is necessary for normal functioning of nerves, cells, muscle, and bone. If there is not enough calcium in the blood, then the body will take calcium from bones, thereby weakening bones. Thus intake of Calcium is necessary to keep the bones strong. Cholecalciferol (Vitamin D) helps the body absorb calcium and phosphorus.