Product Features Moisturizes hair deeply. It repairs and nourishes the hair. It creates brighter, livelier, healthier and stronger hair. Suitable for all hair types. It does not contain paraben and sulfate. It is vegan. The safety and performance of Olaplex products have been extensively tested by independent third-party laboratories in accordance with in-group industry standards. How to Use: Apply to the ends of your hair after shampooing. Leave it for 3-5 minutes and rinse. You can use it with Nº 4 Bond Maintenance Shampoo every wash to add extra shine and strength to your hair.