A vitamin is an organic compound required by an organism as a vital nutrient in limited amounts.
An organic chemical compound (or related set of compounds) is called a vitamin when it cannot be synthesized in sufficient quantities by an organism, and must be obtained from the diet. Thus, the term is conditional both on the circumstances and on the particular organism.
Thirteen vitamins are universally recognized at present.
Vitamins are classified by their biological and chemical activity, not their structure.
Known vitamins:
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