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Vitamins are vital substances. The human body is capable of producing only a fraction of them. A small amount of some vitamins are produced by intestinal bacteria and are used by the body, but for most of the vitamins the human body depends on food supply. Vitamins are organic substances, often components of the enzymes, biocatalysts, the body. Until today have identified 13 vitamins.
Today we know that vitamins are not a homogeneous group of substances, but have enough differences in their chemical composition. They play a lot of different functions involved, among others, in blood clotting, nerve functions, growth, reproduction, defense against infections, digestion and eye function.
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