The K18 Leave-In Molecular Repair Hair Mask is a biotech-powered treatment that works at the molecular level to reverse hair damage in just 4 minutes. The patented K18PEPTIDE is a biomimetic peptide that mimics hair's keratin structure and reconnects broken polypeptide chains and disulfide bonds that are damaged from bleaching, color treatments, chemical services, and heat styling. This leave-in treatment is clinically proven to restore strength, softness, smoothness, and bounce to damaged hair with immediate and lasting results.

The product works on all hair types because it repairs damage at the molecular level where all hair has the same structure. It features a pH-optimized formula between 5.0 and 6.0 to minimize cuticle swelling and put hair proteins in their most resilient state. The lightweight cream format enables easy application across all hair types with detangling and softening benefits. Users apply 1 to 3 pumps to clean, damp towel-dried hair after shampooing without conditioner, let it sit for 4 minutes without rinsing, then style as usual. The treatment provides progressive benefits when used for 4 to 6 consecutive washes after salon services, then as needed for ongoing repair.

The formula contains Water, Alcohol Denat., Propylene Glycol, Cetearyl Alcohol, Dicaprylyl Ether, Cetyl Esters, Behentrimonium Chloride, Polysorbate 20, sh-Oligopeptide-78 (K18PEPTIDE), Hydrolyzed Wheat Protein, Hydrolyzed Wheat Starch, Isopropyl Alcohol, Tocopherol, Phenoxyethanol, Potassium Sorbate, Citric Acid, Fragrance, Geraniol, Linalool, Hexyl Cinnamal, and Benzyl Alcohol. The product is vegan, color-safe, and cruelty-free.