Hair, Skin & Nail SupportBeauty SupportDietary SupplementVegetarian Gluten FreeMicro-Gel Sustained Release SystemBiotin is a water-soluble vitamin critical in the production of keratin, a specialized protein that is a key structural component of healthy hair, skin and nails. It also promotes energy production, fat-burning metabolism and healthy blood sugar control. Biotin supports a healthy immune system function. In a special base that provides for the gradual release of ingredients over a prolonged period of time. Biotin is known for supporting hair, skin and nails...but it does so much more. So make sure you choose only the best biotin supplement, Biotin 10,000 MCG from NaturesPlus.