Calonat D3 Capsule contains Calcium Carbonate and Vitamin D3. Role of key ingredients: Calcium is essential for the growth and strength of bone and teeth. Calcium is also needed for the proper functioning of heart, nerves and blood clotting system. Vitamin D3 plays an important role in calcium absorption from stomach and for other functions of calcium in body. It prevents many conditions related to bones and skin. Calonat D3 Capsule is used for calcium deficiency and bone diseases. Use under medical supervision.