Found in dairy products, meat, fish and some green vegetables, riboflavin plays a role in the metabolism of other nutrients (such as the conversion of tryptophan to niacin or that of folic acid to its active form 5N-MTHF).
Clinical deficiency in children causes growth retardation, skin rashes around mucous membranes as they meet the skin, e.g. at the nostrils. Treatment via supplements is usually successful but may depend on the status of other B vitamins.
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