The "d" Vitamins
نویسنده
چکیده
In a classical sense, vitamin D3, the form produced in animals, is not a true “vitamin” because it is produced in the skin from 7-dehydrocholesterol by UV radiation in the range 290 to 300 nm; 7-dehydrocholesterol is produced from cholesterol metabolism. Only when exposure to sunlight is inadequate does vitamin D3 become a vitamin in the historical sense. Further, vitamin D3 is now termed a provitamin because it requires hydroxylation by the liver and the kidney to be fully active.
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