Redken Extreme Length Shampoo is formulated with Biotin, Castor Oil & Redken's Length Care Complex to helps strengthen damaged hair to lengthen. Extreme Length Shampoo helps hair lengthening by preventing breakage to achieve your desired length. BEST FOR: • All hair types and textures • Fortifying and protecting length • Damaged hair lacking protein BENEFITS • Reduce breakage by 81% when using the full system of Extreme Length Shampoo, Extreme Length Conditioner, and Extreme Length Leave-In Trea