Each capsule contains vitamin A 1500 units and vitamin D3 500 units. The auxiliary materials are refined vegetable oil and vitamin E. Vitamin A exists only in animal food, A 1 exists in the liver of mammals and saltwater fish, while A2 exists in the liver of freshwater fish. Vitamin A has not been found in plant tissues (but β -carotene contained in some plants can be absorbed by human body and converted into vitamin A). The lack of vitamin A in human body affects the dark adaptation ability, such as children's stunting, dry skin, dry eye, night blindness and so on. D(vitamin D, a sterol derivative, has anti-rickets effect, also known as anti-rickets vitamin. The most important members of vitamin D family are D2 and D3. Vitamin D is the derivative of different provitamin D after ultraviolet irradiation. Plants do not contain vitamin D, but provitamin exists in both animals and plants. Vitamin D is a fat-soluble vitamin with five compounds, among which vitamin D2 and vitamin D3 are closely related to health. They have the following three characteristics: it exists in some natural foods; After being irradiated by ultraviolet rays, cholesterol in the human body can be converted into vitamin D. Vitamin AD drops can be used to prevent and treat vitamin A and D deficiency. Such as rickets complicated with night blindness and infantile hand-foot convulsion.