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Everything that a human body does, all of the processes which together add up to the phenomenon that we know as life, are the result of many different chemical reactions. In order for these chemical reactions to occur in the right way, we have to have the right chemicals. Of the many chemicals which make possible the chemical reactions of life, there are some that the human body can manufacture for its own use, and others that it is not able to manufacture, and which it therefore has to obtain by eating them. Vitamins are in the latter category.

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