rare to be deficient in biotin. Symptoms include hair loss, dry scaly skin, cracking in the corners of the mouth (called cheilitis), swollen and painful tongue that is magenta in color (glossitis), dry eyes, loss of appetite, fatigue, insomnia, and depression. People who have been on parenteral nutrition -- nutrition given through an IV -- for a long period of time, those taking antiseizure medication or antibiotics long-term, and people with conditions like Crohn’s disease that make it hard to absorb nutrients are more likely to be deficient in biotin.
Source: Vitamin H (Biotin) | University of Maryland Medical Center
http://umm.edu/health/medical/altmed/supplement/vitamin-h-biotin#ixzz2vsml8pxm
University of Maryland Medical Center
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