4-Minute Leave-in Treatment to clinically reverse hair damage! An at-home leave-in treatment infused with patented K18Peptide™ that works to repair even the most extreme damage, renewing hair to its most youthful, healthy state. This patented bioactive peptide treatment strengthens and improves elasticity while reversing damage from chemical services, thermal styling, and mechanical styling. For all hair types. Hair like new. This leave-in mask heals and strengthens hair with lightweight moisturizing benefits to detangle and keep hair smooth and soft, without weighing it down. For best results, use every 4-6 consecutive washs.