Vitamin AD 1 is used to treat rickets and night blindness. 2, the treatment of children's hand and foot convulsions. 3. Prevention of vitamin AD deficiency Vitamin D is a sterol derivative with anti-rickets effect. Also known as anti-rickets vitamin D3, it is mainly synthesized by the human body itself. After human skin contains one kind, it becomes vitamin D3. Vitamin D3 can also come from animal food, such as liver, especially cod liver oil extracted from marine fish liver, which is used for rickets, osteomalacia, infantile tetany and rickets. Large doses are also used for skin tuberculosis, skin mucosal lupus erythematosus, etc.