Formulated with the highest possible dose of their patented technology in any of their at-home products, this lightweight yet intensive hair treatment works as a primer for the rest of your OLAPLEX routine to rebuild the hair\\\'s bonds, helping to protect and strengthen for hair that feels nourished, restored and healthy. Benefits of OLAPLEX No.0 Intensive Bond Building Hair Treatment: Infused with the highest dose of OLAPLEX patented technology in any at-home product. Rebuilds bonds, strengthens and protects. Vegan and cruelty-free. Gluten free and nut free. Paraben free, sulphate free and phthalates free. Scientifically proven with 68% more repair & 3x Stronger hair* *When used as a two-part system in just one use. OLAPLEX\\\'S No.0 Intensive Bond Building Treatment primes the hair so that it is ready to absorb optimum nourishment from the rest of your OLAPLEX haircare routine. Vegan and cruelty-free, this bond repairing treatment is scientifically proven with 68% more repair and 3x stronger hair. For maximum results and restoration, use as part of the two-step system with the No.3 Hair Perfector for the most powerful at-home haircare treatment to help rebuild bonds, protect and strengthen strands with each use for hair that looks and feels vibrant and healthy. *When used as a two-part system in just one use. How to use: Use as part of the two-step system with No.3 once per week or two-three times per week for damaged hair. Apply to dry hair and comb through, making sure to fully coat each section from root to tip. Size: 155ml