BHD 13.750
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%
BHD 13.750
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K18
Leave-In Molecular Repair Hair Mask
BHD 13.750
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
MrsStaffney
Verified Buyer
5
3/30/2026
Just as great as I was told it would be!
I used this product like it told me for super damaged hair, so for 6 consecutive washes I applied it. It did wonders allowing the cuticle of my hair shaft to close. Since then I've been using it 1 to 2 times a week and its continued to allow my hair to look and feel so much healthier. I like the product so much I went back and got the oil to pair with it and I love that as well.
Originally posted on sephora.com
Fay
5
3/29/2026
Rescued my hair
Used after bleaching my hair. Left it much more manageable. A little goes a long way.
Originally posted on Sephora-uk