Primes hair to absorb nourishment for maximum repair. A professional-inspired treatment that primes hair for deeper repair with the highest dose of patented OLAPLEX technology in any take-home product. It rebuilds hair bonds, strengthens and protects hair integrity. Use as the first step in a two-part system with N .3 Hair Perfector. Where: Apply to dry hair, fully saturating each section. When: Use the two-part system with N .3 once a week or two to three times a week for damaged hair. For: All hair types, especially for those with visible damage. Scientifically Proven: 68% more repair & 3x stronger hair* *When used as a two-part system in just one use. Application Tip: N .0 bottle should last 3-6 applications, based on hair length and density. PH Balanced Vegan Cruelty Free Gluten Free Nut Free Parben Free Phthalates Free Phosphate Free Sulfate Free Directions: Apply N .0 slowly to dry hair, distributing evenly from root to tip. Work N .0 int