Vitamins are organic substances present in very small quantities in food, but necessary for metabolism. They are grouped together not because they are chemically related or have similar physiological functions, but because they are vital factors in the diet and they all were discovered in connection with the diseases that were caused owing to their deficiency (Latham, 2002). They are classified as either water-soluble or fat soluble. There are 13 vitamins: 4 fat-soluble (A, D, E and K) and 9 water-soluble (8 vitamins of the B group and vitamin C).