MarketingNoSuchThing: Vitamins are all single molecules (look up on Google images) which are common in the vast majority of foods which humans have long eaten. Humans have not maintained every gene to make every protein enzyme to make them (generally missing only 1 of many steps) out of other molecules. Vitamins serve as helpers for cells to perform specific intracellular chemical reactions. Marketed for $, not health.
Answered 6/21/2017
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