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Cholecalciferol (English: Cholecalciferol, also known as vitamin D3 or cholecalciferol) is a kind of vitamin D, and 7-dehydrocholesterol generated after dehydrogenation of cholesterol can be irradiated with ultraviolet light to form cholecalciferol, so it is also known as Cholecalciferol. It is said that the provitamin D of cholecalciferol is 7-dehydrocholesterol