and its analogues are a group of sterol compounds that occur naturally,
chiefly in animals. It can also be found in plants and yeasts. The D vitamins
are generated from the provitamins ergosterol and 7-dehydrocholesterol,
which are found in plants and animals.
Ultraviolet irridiation of a variety of this
animal and plant sterols results in the conversion of provitamins to compounds
with vitamin D activity. Ergosterol, which is derived from plants, can be
converted into ergocalciferol otherwise known as calciferol
(vitamin D2) with the aid of ultraviolet irridiation (see diagram below).
For instance, vitamin D was once made available in commercial quantities
when vitamin D2 was manufactured by irridiation of ergosterol derived from
Chemical Name (IUPAC):
Check out the information on the Cholecalciferol
The cholecalciferol page also mentions the reaction
of sunlight which has to be carefully watched when treating poisoning by
vitamin D2 and D3, the reaction is below.
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