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Provitamins
Pro-vitamins are substances in the body are converted into vitamin. Two known provitamin the amino acid tryptophan, which is converted to niacin, and beta-carotene, which converts to vitamin A. Beta carotene belongs to a class of compounds called carotenoids. Carotenoids also give the typical color of yellow and orange fruits and vegetables. In addition to its ability to be converted into vitamin A, beta carotene has an important role in the body of an antioxidant that protects cells against the adverse effects of free radicals.
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