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Vitamins are organic compounds necessary for metabolism. They are not cell components; thus only small amounts are needed. Most of them act as enzyme cofactors or are involved in energy transfer or in maintaining membrane integrity. Vitamins are divided in two families: (i) fat soluble (non polar): A, D, E, K and (ii) water soluble (polar): B family, i.e., thiamin, riboflavin, vitamin B6, niacin (nicotinic acid), folic acid, pantothenic acid, biotin, C (ascorbic acid) and (meso) inositol.
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