Vitamin D3 is a common name of cholecalciferol. Vitamin D3 is a fat-soluble vitamin. Cholecalciferol is used to treat and prevent the bones disorders like rickets and osteomalacia.
Vitamin D3 is synthesized by the body when skin is exposed to sunlight. Cholecalciferol helps your body to absorb calcium and phosphorus, means helps to regulate the calcium and phosphorus levels within your blood stream. So if you are suffering from osteoporosis, you need more vitamin D3.