Description: Cholecalciferol (Vitamin D3), which is a fat-soluble vitamin that helps the bone absorb calcium and phosphorus, is essential for maintaining healthy bones. Vitamin D3 is produced by the body when skin comes in contact with ultraviolet B rays emitted by the sun. Skin pigmentation, sunscreen use, time spent indoors, and lack of exposure to sunlight can lead to low levels of vitamin D3 in the body.