["GNC Womens Advanced Hair Skin & Nails formula contains 2000% of the required daily value of biotin. Biotin helps keep your hair and nails strong and healthy." "Low levels of biotin can lead to hair thinning and rashes around the eyes nose and mouth. GNC Womens Advanced Hair Skin & Nails formula also contains collagen and lutein to support healthy skin structure and hyaluronic acid to improve skin elasticity for a more youthful appearance." Biotin plays a crucial role in energy metabolism This physician-endorsed dietary beauty supplement boasts high levels of antioxidants that prevent oxidative damage from free radicals. Contains 6000mcg of biotin]