A leave-in treatment mask for all hair types that clinically reverses damage in 4 minutes. Patented peptide technology repairs damage from bleach, color, chemical services and heat - restoring hair's strength, softness, smoothness and bounce. When hair is damaged, the polypeptide chains (keratin chains) that form the internal structure of hair strands weaken and break. For context, there are billions upon billions of polypeptide chains (keratin chains) in a single strand of hair. When these are damaged, the core structure of the hair responsible for elasticity and strength is compromised, causing it to lose its resilience and shine - or the look and feel of healthy hair. After spending a decade in the lab scanning and testing all the amino acid sequences of the entire keratin genome that makes up human hair in search of a breakthrough, we discovered a unique sequence (a bioactive peptide) that restores damaged hair to its original, youthful state . This is our K18Peptide.