A highly-nourishing and reparative shampoo. N°4 Shampoo repairs and protects hair from everyday stresses — including damaged hair, split ends, and frizz — by re-linking broken bonds. Leaves hair easier to manage, shinier and healthier with each use. N°4 is color-safe and proven to reduce breakage and strengthen all types of hair. PH Balance: 6-6.5 *Source: The NPD Group/ U.S. Prestige Beauty Total Measured Market, Hair Sales, Annual 2021