Vitamin AD is a compound preparation, each capsule contains vitamin A 1500 units and vitamin D2 500 units. The auxiliary materials are vegetable oil, gelatin, glycerol and purified water.
Vitamin D3 is a fat-soluble vitamin, and it is also regarded as a hormone precursor that acts on calcium and phosphorus metabolism. It is closely related to sunlight, so it is also called "sunshine vitamin". Vitamin D3 (cholecalciferol) is mainly synthesized by the human body itself. The human skin contains a kind of cholesterol, which becomes vitamin D3 after being irradiated by sunlight. Therefore, if the child can fully accept the direct sunlight to the skin for more than 4-6 hours, the vitamin D3 synthesized by himself can basically be satisfied.