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K18 Biomimetic HairscienceLeave-in Molecular Repair Hair Mask - Treatment for Damaged Hair
Product Description
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.
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Rated 5 out of
5
by
Anonymous from
Rescued my hair
Used after bleaching my hair. Left it much more manageable. A little goes a long way.
Date published: 2026-03-29
Rated 3 out of
5
by
Fiorella from
Recommend the small size
Hard to tell is this product actually works. There’s mixed reviews of how to even apply it. On the box it says not to condition your hair after use , which would effectively leave your hair super dry (specially for recently bleached hair). But then on their official website’s forum they say it’s ok to condition after the four minutes.
I don’t notice a difference when I use it. Could be working , but could be a gimmick.
Date published: 2026-03-21
Rated 5 out of
5
by
SHANO from
K18
Amazing hair mask
Date published: 2026-03-18
Rated 5 out of
5
by
Daisy from
Best hair product ever
I’ve been bleaching my hair for 5 years and had severely damaged broken hair. Once I started using this my hair has never been better. It’s the only product that transformed my hair. Make sure to learn how to apply it properly as when you know how to use it you will have the most amazing results. My hair stopped breaking off and finally started to grow. This let me still continue to bleach my hair without my hair getting more damaged. The results aren’t necessarily instant but overtime you will look back and see how much your hair has improved. I work as a beauty advisor in a big beauty retailer and this is my favourite product in the entire store. Honestly if you have damaged hair you need to get this. I know it’s pricey but it’s such an investment and worth it. Even using just this for damaged hair and nothing else your hair will transform !!
Date published: 2026-03-17
Rated 4 out of
5
by
Lea from
Great result but very expensive
I was a bit sceptical before buying because leave-in masks aren’t usually part of my routine and I was worried about a greasy finish on my fine hair. After checking the proper application, I realised a very small amount is enough. I could already see the benefits after the first use and I’m really happy with the results. The only downside is the price, It is very high for the quantity
Date published: 2026-03-14
Rated 5 out of
5
by
ZOE from
Love use after shampooing then condition after
Will always love this. 4c very thick straight natural girlie. I see this to make sure I don’t get to much damage ans repair bonds as I have texture releases in my hair. I used after shampooing, leave it in for 4mins minimum then I deep condition/ mask
Date published: 2026-03-12
Rated 1 out of
5
by
Hannah 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
Eleanor 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
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