Description
Vitamin D3 (cholecalciferol) is mainly synthesized by the human body. The human skin contains a type of cholesterol, which becomes vitamin D3 after being exposed to sunlight. In addition, vitamin D3 can also come from animal foods, such as liver, especially cod liver oil extracted from seafood liver. In addition to being present in a few animal foods, vitamin D3 is mainly formed by 7-dehydrocholesterol in the skin after being exposed to ultraviolet rays, and 7-dehydrocholesterol is generated by the conversion of cholesterol. Vitamin D3 is fat-soluble, insoluble in water, and can only be dissolved in fat or fat solvents. It can withstand high temperatures and oxidation in neutral and alkaline solutions.
