Calstar tablet contains Calcium CarbonateVitamin D3(cholecalciferol)Vitamin C and Vitamin B12(Methylcobalamin) which is used as bone joint supplement. Calcium carbonate is a mineral that is required for the formation of bones and maintaining them. Calcium carbonate is required to prevent breakage of bones. Calcium is used to prevent or treat low blood calcium levels in people who do not get enough calcium from their diets.Vitamin D3 that is used in the absorption of calcium in the blood. Vitamin D3 helps in processing of essential minerals in the body like Calcium and Phosphorus. Lack of Vitamin D3 results in bone weakening bone pain and skin diseases. Vitamin C helps the body absorb more iron. Vitamin C is a water-soluble vitamin with antioxidant activity required by the body to make collagen.Vitamin B12 plays a role in the activity of bone cells bone formation and red blood cell production all of which impact your bone health.Calstar is a nutritional supplement which can be taken by people who have low levels of calcium in their blood.Calstar is used in elderly people to keep bones healthy and strong and is even effective in Chronic arthritis and Osteoporosis.  Use under medical supervision.