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4.3
Leave-In Molecular Repair Hair Mask
A leave-in treatment mask for all hair types that clinically reverses damage in four minutes. The K18PEPTIDE™ works to repair damage from bleach, color, chemical services, and heat, restoring strength, softness, smoothness, and bounce to hair.This mask is powered by the patented K18PEPTIDE™, which is just the right size and molecular structure to reach the innermost layers of hair and re-connect broken keratin chains responsible for hair's strength and elasticity.
Restores strength, softness, smoothness, and bounce
Repairs damaged hair
Easy leave-in formula delivers lasting results
Clinical Results:
In a clinical study on hair that was bleached 8 times, after 2 uses:
-Biotech-powered K18PEPTIDE™ restored damaged hair by up to 82%
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Leave-In Molecular Repair Hair Mask
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K18 Biomimetic Hairscience
Get hair like new* with K18's biology-first haircare, designed to make the impossible possible.
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Reviews
Recent Reviews
Yuliya22
Verified Buyer
2
6/7/2026
Didn’t work for me
I do not get the hype. My hairdresser recommended this product and I wanted to like it. But it made my hair dry and frizzy. I followed all the instructions, but honestly my hair looks horrible after using it for 3 washes so far thinking to
Originally posted on sephora.com
Ayesha
5
6/6/2026
Hair Feels Stronger and Softer
Made my hair feel smoother, healthier and less prone to breakage. A little goes a long way.
Originally posted on Sephora-uk