Free Standard Shipping within the UK on £40+ Orders
free returns. buy with confidence.
Leave-in molecular repair hair mask 15mL
Mini Leave-In Molecular Repair Hair Mask 15 mL
Grey curly hair before and after results using k18.
Red curly hair before and after results using k18.
Bleach blonde hair before and after results using k18.
get stronger, more resilient hair. left - 8x bleach without K18, right 8x bleach with K18
the K18 routine
Mini Leave-In Molecular Repair Hair Mask 15 mL
Mini Leave-In Molecular Repair Hair Mask 15 mL
less is more
works for all hair types
where does K18 fit into your routine?
Mini versus full size product comparison
Mini Leave-In Molecular Repair Hair Mask 15 mL
Mini Leave-In Molecular Repair Hair Mask 15 mL
K18 routine guide
4.7
Rated 4.7 out of 5 stars
7,748 Reviews

mini leave-in molecular repair hair mask

4-minute leave-in treatment to reverse hair damage

Description

A leave-in treatment mask that works on the molecular level to reverse hair damage in just 4 minutes. The K18PEPTIDE™ is clinically proven to repair damage from bleach + color, chemical services and heat* – with immediate and lasting results to restore strength, softness, smoothness and bounce to hair.

20+ billion TikTok views 🔥

*Disclaimers

Repairs Damage Caused By

  • Bleach + Color
  • Heat
  • Chemical Services
  1. Shampoo, do not condition. Towel-dry thoroughly.
  2. Apply 3-9 pumps of K18 leave-in molecular repair hair mask based on your length and density, starting at the ends and working up towards the roots.
  3. Let sit for 4 minutes. Do not rinse out.
  4. Comb, add product + style as usual. Use for 4-6 washes post-salon service, then as needed.
  • K18PEPTIDE™is a biotech-developed peptide that mimics hair's structure to reverse damage by reconnecting polypeptide chains and disulfide bonds broken during bleaching, color and chemical services + heat*.

  • pH-optimized (5.0-6.0) to help minimize cuticle swelling + put hair proteins in their most resilient state.

  • Cream format enables easy, lightweight application across all hair types, with detangling and softening benefits.

  • Vegan, color-safe, cruelty-free.

Takes damage repair further – reconnects both polypeptide chains (and as a result, also reconnects disulfide bonds) for strength along the length + width of the hair - offering comprehensive, lasting damage repair.

Restores hair from even extreme damage - by working at the innermost layer of the hair, core strength and elasticity are renewed for strong, smooth, bouncy hair.

Delivers immediate and lasting results – hair is repaired from the first use and lasts past your next wash, for ongoing reparative benefits.

Simplified repair - convenient, leave-in formula works in just 4 minutes, with no extra rinse required.

Works on all hair types – because K18PEPTIDE™ works on a molecular level (where all hair is the same), this product is effective on all hair types.

  • DO clarify before K18 if you’re a heavy product user (demineralize for mineral + metal buildup).
  • DO apply on clean, damp hair.
  • DO wait the full 4 minutes before combing or styling.
  • DO add whatever styling products you love after the 4 minutes.
  • DO use for 4-6 shampoos consecutively for progressive results.
  • DON'T use conditioner before applying K18 Mask (you can apply after the 4 min but most find they don’t need it).
  • DON'T overdo it—less is more.
  • DON'T rinse it out.

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.

pairs well with
Molecular repair hair oil
4.8
Rated 4.8 out of 5 stars
806 Reviews
Weightless oil that strengthens, repairs damage + reduces frizz
PEPTIDE PREP™ detox shampoo
4.9
Rated 4.9 out of 5 stars
485 Reviews
Color-safe, non-stripping clarifying shampoo with the K18PEPTIDE™

Description

A leave-in treatment mask that works on the molecular level to reverse hair damage in just 4 minutes. The K18PEPTIDE™ is clinically proven to repair damage from bleach + color, chemical services and heat* – with immediate and lasting results to restore strength, softness, smoothness and bounce to hair.

20+ billion TikTok views 🔥

*Disclaimers

got questions?
Get started here.
The K18 mask works as a treatment to reverse damage in 4 minutes. It’s powered by our biomimetic K18PEPTIDE™ to seamlessly fit in and reconnect broken polypeptide chains at the molecular level. As a result, disulfide bonds are also reconnected for reinforced strength along the length + width of hair—offering comprehensive, lasting, and progressive repair.
K18PEPTIDE™ is a biotech-developed peptide that mimics hair’s structure to reverse damage by reconnecting polypeptide chains and disulfide bonds broken during damage from bleach + color, chemical services, and heat*

*k18hair.co.uk/disclaimers
Conditioner leaves a film that blocks our peptide from penetrating effectively. Once the 4-minute wait time is up, feel free to use a conditioner, a leave-in, or any type of product.
We like to keep our formulas minimal, only using the exact amount of ingredients needed to get the peptide where it needs to go. Here the alcohol serves as an agent to optimize the hair environment for the K18 mask to work on a deeper level. Our unique blend of 3 alcohols functions to open the hair cuticle so the K18PEPTIDE™ can penetrate the innermost layer of hair, reaching the broken polypeptide chains (keratin chains).
Most see results after 2-3 uses. The more damaged the hair, the more dramatic the results so it may vary depending on your hair type and level of damage.
powered by K18PEPTIDE™

Biomimetic peptide clicks into hair’s keratin structure—the source of core strength—for soft, shiny, bouncy results that won’t wash away.

how to use molecular repair mask
1. Shampoo, do not condition. Towel-dry thoroughly.

2. Apply 1-3 pumps based on your length and density, starting at the ends and working up towards the roots.

3. Let sit for 4 minutes. Do not rinse out.

4. Comb, add styling product + style as usual. Use for 4-6 washes, then as needed.
feel what's possible with K18
See how K18 unlocks our community's expression
4.7
Rated 4.7 out of 5 stars
Based on 7,748 reviews
7,748 reviews
  • Debbie H.
    Verified Buyer
    Reviewing
    Mini Leave-In Molecular Repair Hair Mask 15 mL
    I recommend this product
    Age 65+
    Hair Concern Frizz, Dryness, Heat damage
    Hair Type Thick/Coarse, Straight/Wavy
    My Results Less Frizz, Bouncy Hair, Visible Difference, Smoother Hair, Soft Touchable Hair
    Rated 5 out of 5 stars
    7 hours ago
    It’s a product that delivers

    For years I e wondered why my hair doesn’t feel like my hair. It’s coarse and dull. I e thought about this produce for a LONG time. Finally ordered and the first time I used it I couldn’t believe it. My hair felt like mine again. It was soft. I didn’t wilt under the

    Blow dryer getting ready as it dried quickly. I have very thick hair BTW. My husband even commented on my shortened drying time. Thank you for solving my hair issue. I wish I hadn’t taken so long to try it.

  • Mark T.
    Verified Buyer
    Reviewing
    Full-Size Leave-In Molecular Repair Hair Mask 50mL
    I recommend this product
    Age 18 - 24
    Hair Concern Chemical damage, Fragile/brittle hair, Frizz, Split-Ends
    Hair Type Fine/Thin, Medium Density
    My Results Soft Touchable Hair, Smoother Hair, Less Frizz, Visible Difference
    Rated 5 out of 5 stars
    Yesterday
    Great Results for chemical damage

    After using the K18 repair mask, I noticed my hair was a lot less frizz, felt noticeably stronger and less prone to breakage. I truly love the results i get from this product and I hope to use it in my routine.

    KU Profile picture for K18Hair UK
    K18Hair UK
    Yesterday

    Thank you so much for your incredible review, Mark! We're absolutely thrilled to hear that our Full-Size Leave-In Molecular Repair Hair Mask is delivering such amazing results for your chemical damage - there's no better compliment than knowing our molecular repair technology is making your hair less frizzy, noticeably stronger, and less prone to breakage! We love that you're seeing such transformative results and hope it becomes a staple in your routine. ❤️

  • sheila s.
    Verified Buyer
    Reviewing
    Mini Leave-In Molecular Repair Hair Mask 15 mL
    I recommend this product
    Age 65+
    Hair Concern Chemical damage, Heat damage, Dryness, Split-Ends, Color-care
    Hair Type Fine/Thin
    My Results Visible Difference, Stronger Hair, Less Breakage, Shinier Hair, Soft Touchable Hair
    Rated 5 out of 5 stars
    Yesterday
    Finally a product that works

    I am a retired stylist , neurotic about change ….color wise . Hair had gotten fried and dry ,k18 has started repairing my hair , after use it’s smooth healthy and shiny,

    KU Profile picture for K18Hair UK
    K18Hair UK
    Yesterday

    Thank you so much for your incredible review, Sheila! We're absolutely thrilled to hear that our Mini Leave-In Molecular Repair Hair Mask is finally the product that works for you - there's no better compliment than knowing our molecular repair technology is transforming your fried and dry hair into smooth, healthy, and shiny locks! As a retired stylist, your professional endorsement means the world to us, and we love that you're experiencing such amazing results with our treatment. ❤️

  • Ardi S.
    Verified Buyer
    Reviewing
    Leave-In Molecular Repair Hair Mask Sample
    I recommend this product
    Rated 5 out of 5 stars
    Yesterday
    The best hair product

    My mom’s hair used to be damaged and very difficult to manage, but since using K18 products especially the Repair Hair Mask, it has become healthy and easy to manage! My mom loves it!

    KU Profile picture for K18Hair UK
    K18Hair UK
    Yesterday

    Thank you so much for your incredible review, Ardi! We're absolutely thrilled to hear that our Leave-In Molecular Repair Hair Mask has transformed your mom's hair from damaged and difficult to manage into healthy, easy-to-manage hair that she loves - there's no better compliment than knowing our molecular repair technology is making such a meaningful difference for the special people in your life! ❤️

  • Debra C.
    Verified Buyer
    Reviewing
    Leave-In Molecular Repair Hair Mask Sample
    I recommend this product
    Rated 5 out of 5 stars
    2 days ago
    Instant results!

    Thid mask took my hair from dry snd frizzy to smooth and manageable in one use!

    KU Profile picture for K18Hair UK
    K18Hair UK
    2 days ago

    Thank you so much for your incredible review, Debra! We're absolutely thrilled to hear that our Leave-In Molecular Repair Hair Mask Deluxe Sample delivered such instant results, taking your hair from dry and frizzy to smooth and manageable in just one use - there's no better compliment than knowing our molecular repair technology is working so effectively for you right from the start! ❤️

Pro Distribution Partners

Paramount Beauty Supply
USA
Salon Services Pro
USA
Salon Service Group
USA
Salonwax Pro
USA
Premier Beauty Supply
USA
Launching Soon
Ozdare - Australia
AU
 
Launching Soon
American Crew Ltd. - New Zealand
NZ
 
Launching Soon
PlayGround - Hong Kong
HK
 
Launching Soon
Session Map - Sweden
SE
 
Launching Soon
Cyprus
CY
 
Launching Soon
Belgium
BE
 
Coming Early 2021
Canada
CA
 
Coming Early 2021
Czech Republic
CZ
 
Coming Early 2021
Finland
FI
 
Coming Early 2021
France
FR
 
Coming Early 2021
Germany
DE
 
Coming Early 2021
Ireland
IR
 
Coming Early 2021
Italy
IT
 
Coming Early 2021
Netherlands
NL
 
Coming Early 2021
Norway
NO
 
Coming Early 2021
Singapore
SG
 
Coming Early 2021
Taiwan
TW
 
Coming Early 2021
UK
UK
 
Coming Early 2021
thank you for visiting!

You are now being redirected to an official partner website for this region where you can shop K18 Hair.

Changed your mind? Go back.

00:00
subscribe + save 15%
healthy hair on your schedule
Pick your K18 + how often you want to replen.
We’ll send you a heads up before every delivery.
You’re in charge. Change the way you pay, skip a shipment, or cancel anytime.