One of Redkenu0027s best-selling products, this hair strengthening shampoo cleanses, strengthens and fortifies weakened areas. Additionally, it restores and repairs damaged hair while protecting hairu0027s natural shine. Using the full system with Extremeu0027s Shampoo, Conditioner and Anti-Snap will help your hair to have a 73% decrease in breakage and become 3x stronger.To use: Apply as much as needed and gently massage until lathers. Rinse. Followed by Conditioner.