Redken’s Extreme Length Shampoo with biotin strengthens damaged hair and helps hair to grow longer and stronger. Extreme Length Shampoo helps prevent breakage to promote your strongest, healthiest hair. When using Extreme Length’s full system of shampoo, conditioner and sealer, you can help your hair to have a 81% decrease in breakage and 92% reduction of split ends visually. Key features: - 1% Length Care Complex - Biotin: Known to promote healthy hair - Amphoteric Surfactant: Part of a gentle cleansing system