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Vitamins are organic nutrients that the human body needs in small amounts to function properly. They help regulate metabolism, support the immune system, promote growth and development, and maintain healthy skin, bones, and organs. Most vitamins cannot be produced by the body, so they must be obtained through food or supplements. Vitamins are generally classified into two groups: fat-soluble vitamins (A, D, E, and K), which are stored in body fat, and water-soluble vitamins (such as vitamin C and the B-complex vitamins), which dissolve in water and must be consumed regularly.