Strengthen fragile hair with this powerful leave-in treatment designed to reduce breakage and protect against future damage. Formulated with Redken’s Strength Complex, it delivers protein directly into the hair’s core to rebuild internal structure, smooth the cuticle, and minimize split ends. The lightweight formula helps reduce friction from brushing, provides heat protection, and boosts shine—leaving hair stronger, more resilient, and easier to manage. When used with the full Extreme system, breakage is reduced by up to 75%, making it an essential step in any repair routine.