An at-home leave-in treatment infused with our patented K18Peptide™ that works to repair even the most extreme damage, renewing hair to its most youthful, healthy state. HOW TO USE Shampoo, do not condition. Towel dry until damp. Begin with 1 pump of K18 Mask and add more as needed depending on the length, thickness, and condition. Work evenly into hair, one pump at a time, from ends to roots. Let sit for 4 minutes to activate. Do NOT rinse out. Style as usual.