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A vitamin is a living thing (containing carbon) found in plants and animals that the human body should have in minimal amounts. Without vitamins, the human body would not survive, vitamins essential for average growth, metabolism (and energy production in your cells), and health. Vitamins are needed to make enzymes and hormones, which are necessary substances the human body use to make all the required chemical reactions to survive. Most of us get enough vitamins in our diet, but some people may need to take a vitamin supplement because persistent vitamin deficiency will lead to poor health, weakness, and disease.