A professional-inspired treatment that primes and nourishes hair for maximum repair. This salon-level treatment primes hair for deeper repair with the highest dose of patented Olaplex technology in any take-home product. It rebuilds bonds and protects hair's integrity. Use as the first step in a two-part system with the best-selling No. 3 Hair Perfector, which reduces breakage and strengthens strands. Designed for all hair types, especially those with visible damage. - Ideal for repairing chemical, thermal, mechanical, or environmental damage. - Paraban-free. Phthalates-free. Gluten-free. Nut-free. Cruelty-free. pH-balanced. - Free of DEA, aldehydes, and formaldehyde.