K18 Biomimetic HairscienceLeave-in Molecular Repair Hair Mask - Treatment for Damaged Hair
Highlights
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%
Directions
In the shower: -Shampoo, don‘t condition. Once out of the shower: -Using a towel gently dry hair until damp. -Begin with one mL/one dime-size amount of K18 Mask. -Only add more as needed. Average use is two mL/two dime-size amounts (this is a concentrated formula, so you‘ll need much less than traditional masks). -Work evenly into hair from ends to roots. -Let sit for four minutes to activate. -Don‘t rinse out. -Style as usual after the four minutes is up (fine to add heat protectant or styling product now). -Use for the first four to six washes, then swap to maintenance mode and use as needed.
Composition
K18PEPTIDE™ repairs damage from bleach, color, chemical services, and heat.This product is vegan, cruelty-free, and comes in recyclable packaging.
Fragrance Description: The light floral scent features notes of jasmine and peony.
More information
Clean at SephoraIngredients
Water (Aqua) (Eau), Alcohol Denat., Propylene Glycol, Cetearyl Alcohol, Dicaprylyl Ether, Cetyl Esters, Behentrimonium Chloride, Polysorbate 20, sh-Oligopeptide-78 (K18PEPTIDE), Hydrolyzed Wheat Protein, Hydrolyzed Wheat Starch, Isopropyl Alcohol, Tocopherol, Phenoxyethanol, Potassium Sorbate, Citric Acid, Fragrance (Parfum), Geraniol, Linalool, Hexyl Cinnamal, Benzyl Alcohol
This list of ingredients may be subject to change, please consult the packaging of the product purchased.
Bundle
20% SAVING. When you buy 3 selected minis.*
*Simply add 3 qualifying products fulfilled by SEPHORA UK to your Shopping Bag and the discount will automatically apply at checkout. One offer bundle per order. Valid until the 13th September or whilst stock lasts. Cannot be used in conjunction with any other promotional discount. Offer is not applicable to pending purchases or previously made purchases.
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Rated 5 out of
5
by
Millie from
Love it
Great absorption, helps with strength, smoothness and frizz. Can definitely notice the difference between uses.
Date published: 2026-08-12
Rated 5 out of
5
by
Muskaan from
Worth the Investment
This has made such a difference to my hair. It feels stronger, looks shinier, and is much less prone to breakage after styling. I love that it's a leave-in treatment and doesn't add any heaviness. It's definitely become a staple in my haircare routine.
Date published: 2026-08-06
Rated 4 out of
5
by
Lauren from
Bottle only lasts a few uses
I do love this and see a difference when I use it but I got through this soooo quickly I was shcoked. It says use 3 pumps but I have a lot of long, fine hair and I needed about 6 pumps to feel like it made a difference. Very disappointing it is so expensive for such little product
Date published: 2026-08-05
Rated 4 out of
5
by
LYNSAY from
No quick fixes
Leaves my hair lovely and soft but no sign of improved condition, I’m assuming this will take time though
Date published: 2026-07-31
Rated 3 out of
5
by
Jemma from
Extreme cases only
It is a good product but the mini is no way worth it if you are going to spurge on the product get the bigger one as it is shocking how much is in the little one, the product is good but I didn’t see any overwhelming evidence of its effectiveness and unless you hair is falling out in clumps or extremely brittle or you have the money to spend don’t waste you money on this and spend it on a more affordable hair mask
Date published: 2026-07-27
Rated 5 out of
5
by
Catherine from
A must for bleached hair
My hairdressers recommended this to me after having my hair bleached. I always use in for a week after having hair bleached and then about once a month for maintenance. Couldn’t be without it!
Date published: 2026-07-25
Rated 4 out of
5
by
Maddie from
Helped my damaged curly hair
I recently bleached my hair for the first time and it went from silky smooth and super healthy to dry and brittle. I naturally have curly hair and unfortunately these curls were lost! My hair was a frizzy mess and I had ZERO idea how to get back the healthy curls I missed.
I bought this after reading reviews and oh my, my curls are back! I haven’t used this product for an awfully long time but it has done a better job than the cheaper hair masks I have previously used. I know my hair won’t get back its original silkiness for a while but this is definitely a step closer.
Date published: 2026-07-25
Rated 5 out of
5
by
Zoe from
A Haircare Game Changer
This has made a noticeable difference to the condition of my hair. It leaves it feeling softer, stronger, and healthier without weighing it down. A little goes a long way, making it worth the investment.
Date published: 2026-07-22
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