Calcidef tablet contains Calcium and Vitamin D(calcitriol) which is used as bone joint supplement. Calcium is a mineral that is required for the formation of bones and maintaining them. Calcium 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 D(calcitriol) that is used in the absorption of calcium in the blood. Vitamin D helps in processing of essential minerals in the body like Calcium and Phosphorus. Lack of Vitamin D results in bone weakening, bone pain, and skin diseases. Calcidef is a nutritional supplement which can be taken by people who have low levels of calcium in their blood.Calcidef is used in elderly people to keep bones healthy and strong, and is even effective in Chronic arthritis and Osteoporosis. Use under medical supervision.