Nature’s Harmony® Vitamin D 1000 IU provides 25 mcg of vitamin D3 (cholecalciferol), the form of vitamin D that the body produces when the skin is exposed to sunlight. Vitamin D3 plays an important role in the metabolism of calcium and phosphorus, minerals that are essential for strong bones and teeth. The main function of vitamin D, a fat-soluble vitamin, is to maintain normal blood levels of calcium and phosphorus. It also helps in the absorption of calcium, and thus helps to form and maintain strong bones and teeth. Vitamin D is used to treat osteomalacia (softening of the bones) secondary to liver disease, rickets and osteitis fibrosa (inflammation of bone or bony tissue). It plays a role in the management of hypocalcemia (an abnormally low concentration of calcium in the blood). Vitamin D is also used topically to treat psoriasis and it may be protective against some cancers. Nature’s Harmony® Vitamin D 1000 mg provides a high dosage form of this important vitamin.