K18 Mask is used both post-service and as a treatment that repairs damage caused during any salon service or at home via thermal and mechanical styling, and with a pH level of 5.0-6.0, helps to close the cuticle and seal in the peptide, with added lightweight conditioning benefits to keep hair smooth and soft. What else you need to know: K18Peptide is the miracle molecule haircare was waiting for. Clinically proven to reverse damage in just 4 minutes. is the miracle molecule haircare (and your salon) was waiting for. Clinically proven to reverse damage in just 4 minutes. Like-new hair that has been damaged hair from the inside out. Healed damage from bleach, color, chemical services, heat, and mechanical styling. Restored strength, softness, smoothness. and bounce.