Health & Beauty > Hair > Treatment.Brand : K18.K18 Leave-In Molecular Repair Hair Mask 5ml/0.17oz.A leave-in treatment mask that works on the molecular level to reverse hair damage in just 4 minutes. The K18PEPTIDE is clinically proven to repair damage from bleach + color, chemical services and heat - with immediate and lasting results to restore strength, softness, smoothness and bounce to hair.K18PEPTIDE™is a biotech-developed peptide that mimics hair's structure to reverse damage by reconnecting polypeptide chains and disulfide bonds broken during bleaching, color and chemical services + heat.pH-optimized (5.0-6.0) to help minimize cuticle swelling + put hair proteins in their most resilient stateCream format enables easy, lightweight application across all hair types, with detangling and softening benefitsTakes damage repair further – reconnects both polypeptide chains (and as a result, also reconnects disulfide bonds) for strength along the