Biotin deficiency to be rare. https://emedicine.medscape.com/article/984803-overview Medscape biotin deficiency Medscape: Biotin Deficiency https://emedicine.medscape.com/article/984803-overview https://emedicine.medscape.com/article/984803-overview Biotin Biotin deficiency to be rare. Biotin deficiency to be rare. Biotin Deficiency biotin deficiency