Redken Extreme Length Leave-In Conditioner with Redken's Length Care Complex made with Biotin and Soy Protein helps hair growth by strengthening damaged hair to grow longer and stronger. Extreme Length Leave-In Conditioner also helps prevent hair breakage. Reduces breakage by 81% when used as a full system with Redken Extreme Length Shampoo and Extreme Length Conditioner Visibly reduces the appearance of split ends by 78% Formulated with biotin and soy protein to help strengthen hair Adds manageability, smoothness and shine