Olaplex No. 0 Intensive Bond Building Hair Treatment - 5.2oz An intensive hair treatment, to be used in a two-step system.Olaplex?s No.0 Intensive Bond Building Hair Treatment is the pick-me-up your hair needs. With the highest dose of OLAPLEX technology in any at-home product, this treatment works as the first step in a two-step system, acting as a primer for the No.3 Hair Perfector. Benefit Aging, Detangling, Moisturizing, Reconstructing, Volumizing Formula Paraben-free, Sulfate-free Size 1.01 oz, 5.2 oz, 5.24 oz Sustainability Cruelty-free Formula Paraben-free, Sulfate-free Size 5.2 oz Sustainability Cruelty-free