Vitamins
Vitamin: An organic compound required as a nutrient in tiny amounts by an organisms.
It cannot be synthesized in sufficient quantities by an organism, and must be obtained from the diet.
Vitamins have diverse biological function:
hormone-like functions as regulators of mineral metabolism (vit. D),
regulators of cell and tissue growth and differentiation (some forms of vit. A)
antioxidants (vit. E, C)
enzyme cofactors (tightly bound to enzyme as a part of prosthetic group, coenzymes
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