HAIR LOSS LEAVE IN TREATMENT: Our Pro-Growth Biotin Leave in Conditioning Spray is sulfate free, paraben free, phtalate free. It works to keep your hair color vibrant while giving your hair manageability, softness and shine. HAIR SERUM DRY HAIR: Makes hair stronger, fuller and thicker looking. Biotin can improve overall hair quality, thickness and shine. LEAVE IN CONDITIONING TREATMENT: Penetrates hair and scalp and deeply nourishes to promote healthy hair growth. HAIR GROWTH THAT WORKS: Biotin plays an important role in the health of your hair, skin, and nails. A lack of Biotin can lead to hair loss. BIOTIN LEAVE IN CONDITIONER - Fortified, strengthening formula with Biotin, a water-soluble vitamin that's a part of the vitamin B family. ... Your body needs biotin to help convert certain nutrients into energy.