HealthVit CAL-VITA Calcium and Vitamin D3 60 Tablets Meet daily calcium requirements. Vitamin D supports maximum calcium absorption from food. CAL-VITA is formulated with calcium and vitamin D3 specially for adults and old age groups. Calcium contains calcium carbonate, the most concentrated form available. 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. Vitamin D helps your body absorb calcium and phosphorus.