vitamin provitamin antivitamin


Vitamin is organic molecule that are essential micronutrient which organism need in small in small quantities for proper functioning of metabolism.

Vitamins not synthesized in human body so that they have to be supplied in diet.

Some vitamin have hormone like function Vitamin D.

Some vitamins regulate growth and differentiation of cells and tissues vitamin A.

Some vitamins are antioxidents (vitamin E and vitamin C).

Lack of one or more vitamins produces Avitaminosis.

Excess of water soluble vitamins excreted in urine.

Fat soluble vitamins get stored in body. Their excess intake lead to hypervitaminosis (vitamin toxicity) is due to over deposition.

Vitamers; substance that biological activity with particular vitamin.

a. Retinol, retinal, retinoic acid are vitamers of vitamin A.

b. Pyridoxine, pyridoxal, Pyridoxamine are vitamers of vitamin B6.



It is substance which is converted into a vitamin in the body.


Chemical compounds that inhibit action or absorption of certain vitamins.

a. Avidin (egg protein) inhibits absorption of biotin (vitamin B2)

b. Pyrithiamine inhibits enzyme that uses thiamine (vitamin B1).

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