Reference Terms
from Wikipedia, the free encyclopedia

Vitamin

A vitamin is an organic molecule required by a living organism in minute amounts for proper health.

In general, an organism must obtain vitamins or their metabolic precursors from outside the body, most often from the organism's diet.

Note:   The above text is excerpted from the Wikipedia article "Vitamin", which has been released under the GNU Free Documentation License.
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August 4, 2015

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updated 12:56 pm ET