A highly-nourishing and reparative shampoo that leaves hair easier to manage, shinier and healthier with each use. It repairs and protects hair from everyday stresses - including damaged hair, split ends, and frizz - by re-linking broken bonds. N°4 is color-safe and proven to reduce breakage and strengthen all types of hair. PH Balance: 6-6. Awards: A 2021 Allure Best of Beauty Award winner | Olaplex No. 4 Bond Maintenance Hair Shampoo, 8. 5 fl. oz | Dermstore