A leave-in treatment mask that works on the molecular level to reverse hair damage in just 4 minutes. The K18 Peptide 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. 1. Shampoo, do not condition. Towel-dry thoroughly 2. Apply 1-3 pumps of K18 leave-in molecular repair hair mask based on your length and density, starting at the ends and working up towards the roots 3. Let sit for 4 minutes. Do not rinse out 4. Comb, add product + style as usual. Use for 4-6 washes post-salon service, then as needed