Introducing Olaplex Nº0: A Groundbreaking Intensive Hair Treatment Designed For Reinforcing And Rebuilding Hair That Has Been Damaged Or Chemically Processed. This Innovative Product Serves As A Foundational Therapy, Enhancing The Effectiveness Of Nº3 And Can Be Used Conveniently At Home. Created To Work Synergistically With Nº3, It Penetrates Deeply Into The Hair Strands, Prepping Them For Optimal Results From The Follow-up Treatment, Nº3 Hair Perfector. This Dual Application Leads To A Repair Effect That Is Proven To Be Three Times More Impactful. When Used Together, These Two Formulas Result In An Impressive 68% Increase In Reparative Benefits Compared To Using Nº3 Alone. With A Lightweight Gel-lotion Consistency, This Formula Is Devoid Of Harmful Ingredients Such As Sulfates, Parabens, Phosphates, Phthalates, And Gluten. It’s Also Vegan-friendly, Cruelty-free, And Balanced In Ph.