The vitamins are organic compounds of diverse chemical nature. They are required in minute amounts for normal growth, functioning and reproduction of cells. The vitamins play an important role in the cellular metabolism and act asthe enzymes or other biological catalysts in the various chemical activities of the cell. Their importance for the animals has been reported by Hopkins, Osborne,Mendal, and McCollum(1912-1913). Funk (1912) demonstrated the presence of basic nitrogen in them and gave the name“vitamins” meaning vital amines to them.
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