BurgerClosechevronBagSearchUser
  • Delivery country: United States
  • servicesStores & services
    Liverpool One
    Stores
    Sephora Liverpool One
    5 South John Street, Liverpool One Mall, Liverpool, L1 8BU
    View All Hours +
    Cycle
    Change your store

    Your favourite store allows you to see services available and book appointments

    In-Store Services
    Make-up and skincare services, Benefit BrowBar, gifting and personalisation workshop, Sephora offers you a whole range of services to come and discover in store Make an appointment
    (Liverpool One)
    See all store services
  • Wishlist
  • Cart0
Leave-in Molecular Repair Hair Mask - Treatment for Damaged Hair

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

%0 3.83 | 1115 reviews
Box

from £30.00 (£2.00 per ml)

Select Size (2)

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

If you like we can let you know when we have some more.

Product Description

Highlights Sephora badge
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.

See more...

Rated 5 out of 5 by from this has transformed the feel of my hair, have to be careful not to use too much too often or hair does feel thick of product, however using correctly doers improve hair quality
Date published: 2026-01-19
Rated 5 out of 5 by from Works for me! I read the reviews and realised how mixed they were but I am pleased I decided to try this product anyway. My hair was badly damaged after colouring and straightening and other bond and protein products smoothed my hair but didn’t treat the actual damage until k18. I brought the smallest bottle first because of the cost and it wasn’t until the second time I used this I noticed a shine and less breakage as it is suppose to work from the inside out. I brought another bottle and used it 6 times consecutively and I was really pleased with the results! I have very thick frizzy dry hair I do need a few pumps to coat it well and it wasn’t until worth the cost k18 works for me! I now use it twice a month and realise all the cost I had incurred trying cheaper quick fixes and will switch to maintenance mode and will always use this!
Date published: 2026-01-15
Rated 5 out of 5 by from I have bought this once fell in love got another one for myself. It’s beautiful gives you a beautiful shine on your hair. Makes your hair soft 1010 for me.
Date published: 2026-01-12
Rated 4 out of 5 by from Buy small to try :) Wanted to buy the smaller one before I committed to the bigger one and I can say that that will definitely be happening! You really do not need conditioner after your shampoo if this is your routine, left my hair feeling like I had a hair mask gone all night after washing and putting this into my hair after towel drying :)
Date published: 2026-01-11
Rated 2 out of 5 by from ehhh I don’t see the results everyone else seems to be seeing. I feel like it doesn’t do much for my hair, despite correct application. I guess my hair is a tiny bit healthier, but I think you’d need a lot of bottles to see a major difference.
Date published: 2026-01-07
Rated 3 out of 5 by from Maybe not for curly hair Easy to use but for curly hair I'm having to straighten after application to see results
Date published: 2026-01-04
Rated 5 out of 5 by from Amazing ! Honestly obsessed with this. My hair feels noticeably softer and smoother after using it, without any heavy or greasy feeling. Perfect if your ends are dry or damaged and you want that fresh healthy just had a trim vibe.Smells is gorgeous!
Date published: 2025-12-14
Rated 5 out of 5 by from 3rd time purchasing 3rd re purchase. Amazing product. Hair is healthier and longer due to less breakage and sleekness 👌🏼
Date published: 2025-12-13
  • y_2026, m_1, d_26, h_15
  • bvseo_bulk, prod_bvrr, vn_bulk_3.0.42
  • cp_1, bvpage1
  • co_hasreviews, tv_61, tr_86
  • loc_en_GB, sid_174428, prod, sort_[SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_sephora-uk
  • bvseo_sdk, p_sdk, 3.2.0
  • CLOUD, getReviews, 129.72ms
  • REVIEWS, PRODUCT