The chronic ingestion of raw egg whites may cause a biotin deficiency. Raw egg whites contain an enzyme called avidin that destroys biotin. Also, prolonged taking of antibiotics has been shown to decrease biotin levels in the body. Signs of a biotin deficiency are skin lesions, dry haircoat, anemia, and lethargy.
Liver, oils from seeds, and yeast are the most important natural sources of biotin. Biotin is also found in supplements, either on its own, as a vitamin-mineral supplement, or in Drs. Foster & Smith Brewers Yeast, which is naturally rich in biotin.
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