HAIR GROWTH HAIR MASK: Strengthening formula with Biotin. Biotin is a water-soluble vitamin that's a part of the vitamin B family. Your body needs biotin to help convert certain nutrients into energy. NATURAL HAIR MASK FOR HAIR GROWTH Deeply repairs damaged hair. Biotin also plays an important role in the health of your hair, skin, and nails. If you aren't getting enough biotin, you may experience hair loss. HAIR GROWTH MASK Promotes longer hair by strengthening the hair follicle for healthy hair growth. Sulfate Free - Paraben Free - Phthalate Free - Color Safe Formula. SIZE: 8 Ounces HOW TO USE: Use bi-weekly for more noticeable results of hair strengthening while promoting healthy new growth and conditioning. On clean, wet hair apply the hair mask liberally all over hair. Gently comb through and allow to sit and penetrate into the hair for up to 7 minutes. For best results, use accompanying Biotin Pro-Growth Shampoo and Conditioner, along with the Root Stimulator.