A weekly at-home treatment, not a conditioner, that reduces breakage and visibly strengthens hair, improving its look and feel. Clients can benefit from this global bestseller whether or not they receive chemical services. PRO TIP: Prime your hair for deeper repair with Olaplex's professional-inspired No.0 Intensive Bond Building Hair Treatment (sold separately). Use No.0 as the first step in a two-part at-home system with No.3 Hair Perfector to strengthen and repair all types of damaged hair. Scientifically Proven: 68% more repair and 3x stronger hair* *When used as a two-part system in just one use. PH Balance: 3.5-5 #1 Product in Prestige Haircare* This global best-seller is an at-home treatment, not a conditioner. It reduces breakage and visibly strengthens hair. *NPD Jan 2020-Jun 2021 Key benefits: - Repairs damaged and compromised hair - Strengthens and protects hair structure - Restores healthy appearance and texture - Product Tip: Use N?3 before you wash your hair and leave it