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Leave-in Molecular Repair Hair Mask - Treatment for Damaged Hair
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K18 Biomimetic Hairscience Leave-in Molecular Repair Hair Mask - Treatment for Damaged Hair

%0 3.91 | 1291 reviews
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from £30.00 (£2.00 per ml)

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15ml (£2.00 per ml) £30.00In stock50ml (£1.40 per ml) £70.00In stock
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Product Description

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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 Sephora

Ingredients

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.

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Rated 5 out of 5 by 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 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 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
Rated 5 out of 5 by from Highly recommend Amazing product! Tames frizz and strengthens hair!
Date published: 2026-07-21
Rated 5 out of 5 by from Amazinf Honestly saved my hair after bleaching, will never stop reusing
Date published: 2026-07-20
Rated 5 out of 5 by from K18 hair mask It worked really well to repair my damaged hair, great product but it’s definitely worth stocking up when it’s on offer
Date published: 2026-07-19
Rated 5 out of 5 by from Amazing product Noticed the difference after a few uses. Incredible stuff.
Date published: 2026-07-01
Rated 4 out of 5 by from Good Nice product but I guess I was expediting more for my permed hair.
Date published: 2026-06-30
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