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Vitamins are chemical chemicals that are required in little amounts by humans. The majority of vitamins must be obtained from food since the body either does not create them or generates just a little amount. Vitamin needs fluctuate depending on the organism. Humans, for example, require vitamin C from their food, but dogs can create all of their own vitamin C. Vitamin D is not present in sufficient levels in diet for humans. Vitamins serve a variety of functions in the body, and each individual need a different quantity of each vitamin to keep healthy.