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Deficiency of riboflavin is not common in the U.S. because this vitamin is plentiful in the food supply. Significant deficiency syndromes are characterized by sore throat, swelling of mucous membranes, mouth and/or lip sores, anemia, and skin disorders.
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There is no known toxicity to riboflavin. Because riboflavin is a water-soluble vitamin, excess amounts are easily excreted by the body in the urine.
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