The vitamins are a group of complex organic
compounds required in small quantities by the body for the maintenance of good
health. They are not normally synthesized in the body and hence they should be
supplied by the diet. The vitamins are present in foods in small quantities.
Unlike other groups of nutrients the vitamins
are not chemically similar to each other. Each vitamin has a specific chemical
structure and a specific function or functions in the living system. Most of
the vitamins act as coenzymes in the body. Normally a well balanced diet will
supply all the necessary vitamins in sufficient quantity.