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What is the difference between vitamin D2 D3?

Update:19-01-2022

Vitamin D does not have D1. It has various forms such as D2, D3, D4, D5, D6 and D7 according to the structure of its side chain. The difference between D2 and D3 has three points, namely:

1. Different categories

Vitamin D2, called ergocalciferol, comes from plants, while vitamin D3, also known as cholecalciferol, is found in animal tissues and cod liver oil.

2. Different production methods

Vitamin D2 is produced by ergosterol in UV-irradiated plants and is less present in nature.
Vitamin D3 is converted from 7-dehydrocholesterol contained in the epidermis and dermis of most advanced animals by ultraviolet (wavelength 265~228nm) irradiation. Vitamin D3 (cholecalciferol) is mainly synthesized by the human body itself. Human skin contains a type of cholesterol, which becomes vitamin D3 when exposed to sunlight.

3 different names

The name for vitamin D2 is 9,10-chain scission-(5Z,7E)-5,7,10(10),22-ergostatetraen-3β-ol.
The official name for vitamin D3 is 9,10-chain scission (5Z,7E)-5,7,10(19),22-cholestatrien-3β-ol ergocalciferol.

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