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English name: Vitamin D3 CAS Number: 67-97-0 Molecular formula: C27H44O Molecular weight: 384.64 EINECS Number: 200-673-2 Melting point: 83-86°C(lit.) Specific rotation: 105º(c=0.8, EtOH25ºC) Boiling point: 451.27°C (rough estimate) Density: 0.9717 (rough estimate) Vapor pressure: 2.0xl0-6Pa(20°C,est.) Refractive index: 1.5100 (estimate) Flash point: 14°C Storage conditions: -20°C

Vitamin D3, also known as cholecalciferol, is a type of vitamin D that has been shown 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, which mainly regulates calcium and phosphorus metabolism in the body. Vitamin D3 is converted from 7-dehydrocholesterol in the skin by ultraviolet radiation.

Vitamin D3 is a fat-soluble vitamin known as the "sunshine vitamin" because most people can synthesize their own vitamin D from UV rays and cholesterol in the skin when the skin is moderately exposed to sunlight. It is mainly synthesized by the human body itself, and the human skin contains a type of cholesterol, which becomes vitamin D3 when exposed to sunlight. Therefore, if the child can fully receive direct sunlight on the skin for more than 4 to 6 hours, the vitamin D3 synthesized by itself can basically meet the needs.

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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 lacking, 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. There are more than a dozen compounds known to have vitamin D effects, none of which are steroid derivatives, among which vitamin D2 and vitamin D3 are of great practical significance. 4. Mainly used for food, health care products and other related products 5.VitaminD3 acts through the receptor, which is a member of the ligand-dependent transcription factor family, regulates the proliferation and differentiation of normal cells and cancer cells, and has anti-proliferative, Anti-transfer effect. Activated vitamin D receptors in the gut and bone also maintain calcium absorption and homeostasis. 6. Vitamin drugs, mainly to promote the absorption and deposition of calcium and phosphorus in the intestine, for the treatment of rickets and osteomalacia