Protects and repairs damaged hair, split ends and frizz by re-linking broken bonds. A highly-moisturizing, reparative shampoo that leaves hair easy to manage, shiny and healthier with each use. Key benefits: Repairs and maintains bonds within the hair. Eliminates frizz and flyaways . Reduces breakage . This shampoo repairs and protects hair from everyday stressesincluding damaged hair, split ends, and frizzby re-linking broken bonds. N4 is color-safe and proven to reduce breakage and strengthen all types of hair. Suitable for all hair types. Paraben-Free. Sulfate-Free. Phthalate-Free. **OLAPLEX products are thoroughly tested in-house and by independent third-party laboratories for safety and efficacy. This product testing includes the industry standard Human Repeat Insult Patch Test (HRIPT), which tests for skin irritation or sensitivity. All of OLAPLEX products passed the HRIPT, meaning the products show no signs of causing irritation, inflammation, or sensitivity. **

A highly concentrated, color-safe shampoo proven to reduce breakage and nourish hair leaving it smoother, shinier, and more manageable with every wash. The richly lathering formula gently yet thoroughly cleanses every hair type without stripping or drying to maintain hydrated hair and scalp. Use it with No.5 daily or any time you cleanse.