K18Peptide™ is the patented molecular breakthrough clinically proven to reverse hair damage from: bleach + color, chemical services, and heat in just 4 minutes. Renew strength, softness, smoothness, …

This leave-in treatment mask works on the molecular level to reverse hair damage in just 4 minutes. It tackles daily damage with immediate and lasting results to restore strength, softness, smoothness …

May 29, 2025 · I haven't had a hair routine without the K18 hair mask in nearly six years, and I cannot imagine ever going back. Truly, it's the best repairing product I've ever tried.

What it is: A leave-in treatment mask for all hair types that clinically reverses damage in four minutes. The patented peptide technology works to repair damage from bleach, color, chemical services, and …

This leave-in treatment mask for all hair types that reverses damage in 4 minutes. Patented peptide technology works to repair damage from bleach + color, chemical services, and heat* — restoring …

Feb 12, 2025 · The K18 Leave-In Molecular Repair Hair Mask made our hair thicker, longer, and healthier. After using it twice weekly for a year, here’s what we found.

Professional, at-home hair treatment mask with a patented peptide. K18 Leave-In Molecular Repair Hair Mask 5 oz repairs and restores your keratin levels while strengthening the cuticle of each strand from …

Dec 16, 2025 · In my hair mask research, two favorites popped up again and again (including in our own roundup of best hair masks): Olaplex No. 3 and the K18 Leave-In Molecular Repair mask. But how …

Apr 23, 2025 · That’s when K18’s patented peptides get to work, traveling deep into the hair’s inner layers to repair broken keratin chains—restoring strength, smoothness, and elasticity from the inside …