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REDKEN Extreme CAT protein treatment strengthens weakened hair fibers and helps reduce hair breakage and split ends, making hair instantly stronger, softer, and shinier. The 2% Protein Strength Complex in the formula works from roots to ends. Hydrolyzed wheat protein repairs damaged structure. Taurine, arginine, and lysine restore the strength and resilience of the hair fiber. Silicone-free. Suitable for all hair types and textures, especially hair damaged by bleaching, coloring, chemical treatments, heat styling, or frequent mechanical stress. Can also be used to strengthen hair before chemical salon treatments.