OLAPLEX's professional-inspired treatment primes your hair for deeper repair, rebuilds hair bonds, strengthens, and protects hair integrity. Use as the first step in a two-part at-home system with No.3 Hair Perfector (sold separately) to strengthen and repair all types of damaged hair. Redesigned for a quick and targeted stream application, the OLAPLEX No. 0 Intensive Bond Building Hair Treatment features an easy to use sprayer that primes the hair and delivers the highest concentration of the patented bond building technology of any Olaplex at home product. Scientifically Proven: 68% more repair & 3x stronger hair* *When used as a two-part system in just one use. Nut Free, Paraben Free, Phosphate Free, Phthalate Free, Sulfate Free, Vegan, Gluten Free, Cruelty Free, All Hair Types, PH Balance DEA Free, Aldehydes Free, Formaldehyde Free.