Damaged, distressed, or over-processed hair that's lost strength and shine; Redken frames it around protein loss rather than a specific hair type, so it applies across textures. It's also used as prep before chemical services (colour, perm, relaxer) to protect hair during processing. It's sold as a retail, at-home product, though the chemical-service-prep use case is typically stylist-directed rather than a decision a consumer would make on their own.

What sets it apart from a regular conditioner is the taurine-and-cationic-protein delivery system, built to rebuild internal strand strength rather than just coat the surface, useful specifically for hair that's lost protein through coloring, perming, or heat damage, including as a pre-treatment before a chemical service to limit the damage that service causes.

Apply after shampooing with Extreme Shampoo, to damp hair. Leave on for 3-5 minutes, then rinse thoroughly. Use 1-3 times per week rather than daily; for hair that needs more intensive strengthening, Redken pairs this with the leave-in Extreme Anti-Snap treatment.

Pros: taurine-assisted protein delivery targets rebuilding internal strand strength rather than just smoothing the surface, useful for hair that's genuinely protein-depleted from chemical processing; a short 3-5 minute rinse-off treatment fits into a normal wash without much extra time.

Cons: it's a protein treatment, not a moisture treatment, so hair that's dry rather than protein-depleted won't see much benefit and could feel more brittle from over-use of protein products; Redken caps recommended use at 1-3 times per week rather than every wash, so it isn't meant to replace a regular conditioner.