K18 Pro Molecular Repair Hair Mask is a leave-in treatment that works at the molecular level to reverse hair damage in just 4 minutes. Powered by the patented K18PEPTIDE biotech formula, it repairs damage from bleach, color, chemical services, and heat by reconnecting broken polypeptide chains and disulfide bonds in hair's keratin structure.

The mask is applied to clean, towel-dried hair without conditioner, using 1-3 pumps depending on hair length and density. After a 4-minute wait time without rinsing, hair is restored with immediate and lasting results including improved strength, softness, smoothness, and bounce. The pH-optimized formula minimizes cuticle swelling and puts hair proteins in their most resilient state.

This professional-size 5 fl oz bottle contains the same award-winning formula trusted by salons, providing comprehensive repair for all hair types including curly, fine, color-treated, and chemically processed hair. The treatment works progressively with best results when used for 4-6 consecutive washes post-salon service, then as needed for maintenance. Vegan, color-safe, and cruelty-free.