Vitamins are a class of nutrients that are essentially required by the body for its various biochemical and physiological processes. Mostly, the human body does not synthesize them; therefore, they must be supplied by the diet in the required amount. Vitamins are subdivided into fat-soluble and water soluble vitamins. Fat-soluble vitamins are those that are soluble in fat solvents. They are A, D, E and K. Water-soluble vitamins are those, which are soluble in water and include vitamin C and vitamin B series that are usually termed as vitamin B complex.