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Elleonora
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The term vitamin derives from experiments conducted early in this century, which indicated that proper nutrition was dependent upon introduction of one or several vital nitrogen-containing amines into the diet. Vitamins are organic molecules (not necessarily amines) that are essential to metabolism in all living organisms. While these molecules serve essentially the same role in all forms of life, higher organisms have lost the ability to synthesize vitamins. There are two major groups of vitamins: the fat-soluble vitamins designated by the letters A, D, E, and K, and the water-soluble vitamins, which are referred to as the vitamin B complex. Most vitamins are converted in vivo into coenzymes that work with metabolic enzymes to complete their biochemical functions. A lack of proper amounts of vitamins in the diet leads to a host of vitamin-deficiency diseases. Below are some interesting images of Ascorbic Acid (Vitamin C). Here's a website showing more images: http://micro.magnet.fsu.edu/vitamins/
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