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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 3.85 | 1162 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 1 out of 5 by from Don’t recommend Do not buy unless you have bleached hair. It made my hair brittle
Date published: 2026-03-09
Rated 5 out of 5 by from Love it I have just started using this and even after 1 wash with it I found my hair feeling better I’ve watch a lot of videos online saying to mix it in your hands till it turns white which is what I have been doing and found it work better that way
Date published: 2026-03-03
Rated 3 out of 5 by from Unsure Like many others, I've heard great things online about this product but for me my hair just feels greasy and tangly with it. I'm going to try the method of waiting the 4 minutes then rinsing and conditioning my hair as using this then just a leave in doesn't work for me. I'd advise others to try this method too but honestly I doubt I will repurchase after this as it's not efficient. Only if I find the results better than other bond repair products.
Date published: 2026-02-25
Rated 3 out of 5 by from On The Fence..... I used this product the way Abby Yung uses as using it the way K18 suggests makes my hair so dry. I am nearly finished a large bottle and I am on the fence. Hair does feel stronger but feels dry and brittle. At the price point I dont know if I would buy again
Date published: 2026-02-20
Rated 3 out of 5 by from Decent overall - wouldn't purchase again though Makes it easier to brush hair after application. Follow manufacturers guidance for best results. Smells lovely. Probably wouldn't buy again as there are better products for my hair.
Date published: 2026-02-19
Rated 4 out of 5 by from Soft repaired ends, but too expensive! It feels nice on the hair and it has repaired my ends to an extent. So it does make a difference. I’m just not sure that I love it that much to repurchase again
Date published: 2026-02-19
Rated 3 out of 5 by from Not for me I really wanted to like this but I honestly cannot see any difference in my hair,I used it on damp hair,no conditioner,rubbing the product between my hands before-the whole shebbang.Not for me I guess,if anything my hair looks a bit matte and brittle after using and noticed a lot more shedding so I stopped using after the 4th attempt.
Date published: 2026-02-14
Rated 5 out of 5 by from K18 MIRACLE hair mask Does the job perfectly, repairs damage hair and nourishes
Date published: 2026-02-12
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