Vitamins are organic substances that we require in very small amounts for two purposes: to perform specific metabolic functions and to help manufacture components of body tissue (bone, hair, skin, nerves, and brain). Vitamins are necessary for life and health. They are essential nutrients because we derive them exclusively from our diet. The body cannot manufacture them. Because we need only very small amounts, they are usually measured in milligrams and micrograms.
Vitamins can be categorized according to their solubility. Fat-soluble vitamins are absorbed in fat and include vitamins A, D, E, and K. Water-soluble vitamins are absorbed in water and include vitamins C, B1 (thiamin), B2 (riboflavin), B3 (niacin), B5 (pantothenic acid, B6 (pyridoxine), B9 (folate, folacin, folic acid), and B12 (cobalamin or cyanocobalamin)
Vitamins can be categorized according to their solubility. Fat-soluble vitamins are absorbed in fat and include vitamins A, D, E, and K. Water-soluble vitamins are absorbed in water and include vitamins C, B1 (thiamin), B2 (riboflavin), B3 (niacin), B5 (pantothenic acid, B6 (pyridoxine), B9 (folate, folacin, folic acid), and B12 (cobalamin or cyanocobalamin)
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