Redken Extreme Shampoo is a shampoo for damaged hair. This shampoo cleanses, strengthens, and restores damaged hair and prevents future hair breakage. Extreme Shampoo is formulated with Redken's Strength Complex which contains Amino Acids and Arginine to strengthen and fortify the hair, and Citric Acid to condition and add smoothness. Manage and treat your dry, damaged hair with the complete Extreme hair care system.