Vitamins are vital for the normal metabolism in body. Vitamins vary in their chemical structure and are supplied in small amounts in diet, because they are not synthesised in body or their rate of production is not sufficient for maintenance of health (eg. niacin synthesis from tryptophan.) Vitamin deficiency in body may lead to development of deficiency symptoms. Different vitamin preparations are available for prophylaxis and treatment, Most vitamins are non toxic but prolonged intake of Vit. A and Vit. D can cause toxicity. Vitamins are classified in two groups I. Water soluble vitamins B-complex group, vitamin C. II. Fat soluble vitamins Vitamin A, vitamin D, vitamin E, vitamin K.