A patient suffering from a lack of biotin may have poor hair, skin lesions, dried eye discharge, diarrhea, decreased litter size, and in advanced cases, a paralysis of the limbs. Biotin is found in grains, but is not always of a usable quantity. Diets rich in corn or soybean are best, while those of wheat and barley are deficient. Beef liver supplies the richest source, with brewers yeast being next highest. Biotin supplements are also available.
Biotin toxicity is rare to nonexistent.
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