Biotin is a water-soluble B vitamin that supports the formation of keratin, which is a building block for hair, scalp, skin and nails.** Biotin also supports energy metabolism.** At Country Life, just one serving of our High-Potency Biotin 10 mg provides you with 33,333% of your recommended daily value. This biotin supplement is also certified vegan and gluten-free to suit your dietary needs.