Our Hair and Nail Formula provides the optimal combination of ingredients to promote and maintain healthy hair and nails. Biotin is found in high quantities in both hair and nails and is part of their structure. While biotin deficiency is rare under normal circumstances, biotin supplementation may help support healthy hair and nails in those who are biotin deficient. N-Acetylcysteine provides healthy anti-oxidant support to nourish hair and nails while both inositol and para-aminobenzoic acid (PABA) are known to play a role in encouraging hair and nail growth.