For anyone dealing with damaged, weak, or breakage-prone hair — from heat styling, chemical services, or general wear — rather than a specific hair type like curly or straight. It's a retail version of a professional salon-brand shampoo, so it suits salon-going customers replenishing a product they were introduced to in-chair as well as everyday shoppers wanting a strengthening shampoo without a salon visit.

The case for this shampoo over a basic cleansing shampoo is the protein/amino-acid package layered into the cleansing base — arginine and hydrolyzed protein aimed specifically at hair that's already breaking or splitting, rather than a shampoo built only around fragrance and lather.

Apply to damp hair, massage into a lather, and rinse thoroughly. Can be used daily; follow with Redken Extreme Conditioner for the full system.

Pros

• Combines a real cleansing surfactant system with amino-acid and protein actives aimed at breakage specifically, not just generic shine
• Backed by Redken's own named Strength Complex (amino acids + arginine)
• Retail-sized version of a professional-brand shampoo, at lower cost than an in-salon product

Cons

• Contains sodium laureth sulfate, so it is not a sulfate-free shampoo, despite an outdated claim carried on the product page previously — worth flagging clearly for anyone shopping specifically for sulfate-free
• Includes fragrance and fragrance-related allergens
• Contains dimethicone, which may need periodic clarifying to avoid buildup