N°4 is color-safe and proven to reduce breakage and strengthen all types of hair. PH Balance: 6-6.5 How to Use 1. Apply and massage product throughout hair. 2. Rinse product from hair. 3. Follow with Olaplex N°5 Bond Maintenance Conditioner (sold separately). When to Use Formulated for daily/ every wash use. Suitable & Beneficial to All Hair Types — DEA Free — Aldehydes Free — Formaldehyde Free All Hair Types Vegan Nut Free Gluten Free Cruelty Free Sulfate Free Paraben Free Phthalte Free Phosphate Free PH Balanced
