Vitamin D3, also known as cholecalciferol, is a type of vitamin D that has been proven to be the true active form of vitamin D in the body. There are at least 10 known types of vitamin D, but the most important are vitamin D2 (ergocalciferol) and vitamin D3 (cholecalciferol). Cholecalciferol, also known as vitamin D3, is the most important form of vitamin D family. It mainly regulates the metabolism of calcium and phosphorus in the body. Vitamin D3 is transformed from 7-dehydrocholesterol in the skin by ultraviolet radiation.

1) Improve the body's absorption of calcium and phosphorus, so that the levels of plasma calcium and phosphorus can reach saturation;
2) Promote growth and bone calcification, promote healthy teeth;
3) Increase phosphorus absorption through the intestinal wall and increase phosphorus reabsorption through the renal tubules;
4) Maintain the normal level of citrate in the blood;
5) Prevent the loss of amino acids through the kidneys.

1. Vitamin D3 can maintain the normal metabolism of calcium and phosphorus, and can promote the body's absorption of calcium and phosphorus. When it is deficient, children are prone to rickets.
2. Vitamin D3 can maintain the normal metabolism of calcium and phosphorus, and promote the body's absorption of calcium and phosphorus.
3. Vitamin D is a fat-soluble vitamin.
4. Vitamin D3 is mainly used in food, health care products and other related products
5. Vitamin drugs, which mainly promote the absorption and deposition of calcium and phosphorus in the intestines, and are used to treat rickets and osteomalacia