Solvita D Vitamin D Oral Drops contains 400IU of Vitamin D3/ Cholecalciferol an essential vitamin which is needed for normal growth and development of bones in children especially. Vitamin D helps in the absorption and use of calcium and phosphorus and contributes to normal calcium levels in the body. Cholecalciferol or vitamin D3 is also used along with calcium to prevent and treat bone diseases such as softening and weakening of bones in children caused by lack of vitamin D known as Rickets, softening and weakening of bones in adults caused by lack of vitamin D known as Osteomalacia, and a condition in which the bones become thin and weak and break easily called as Osteoporosis. It is needed by the body for healthy bones, muscles, nerves, and to support the immune system and works by helping the body to use more of the calcium found in foods or supplements.