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Professional Molecular Repair Hair Mask 150mL
Curly hair before using K18 mask and curly hair after using K18 mask.
1. patented peptide reverses damage 2. highly concentrated formula 3. for all hair types 4. works in 4 minutes 5. easy leave-in, no rise needed 6. vegan & cruelty-free
Professional Molecular Repair Mask pump gif 150 mL
strong, resilient hair at every step
Professional Molecular Repair Hair Mask 150mL - model
Professional Molecular Repair Mask swatch 150 mL
Rated 4.8 out of 5
Based on 1708 reviews

professional molecular repair mask

Second step of K18REPAIR™ service reverses damage post-service

Professional Only

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Description

Made to be used as part of the K18REPAIR™ service (K18 PRO mist + K18 PRO mask)

This leave-in treatment mask repairs hair damage and restores hair to a healthy state after salon services. Powered by the K18PEPTIDE™ to reconnect broken polypeptide chains and disulfide bonds to renew strength and elasticity in just 4 minutes. This mask is clinically proven to repair damage from bleach* + color*, chemical services*, and heat* for immediate + lasting results. Cream-based format helps soften, smooth, and condition hair.

*Disclaimers

Repairs Damage Caused By

  • Bleach + Color
  • Heat
  • Chemical Services

Takes damage repair further – biomimetic peptide seamlessly fits in and reconnects 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 repair

Restores hair before and after color and chemical services 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

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 and with every service

Clinically proven to reverse hair damage – from: bleach* + color*, chemical services*, and heat*

*Disclaimers

  • K18PEPTIDE™ is a biotech-developed peptide that mimics hair's structure to reverse damage by reconnecting polypeptide chains and disulfide bonds broken during bleach, color and chemical services, and heat*.

  • pH-optimized (5.0-6.0) to help minimize cuticle swelling + put hair proteins in their most resilient state after salon service or shampoo

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

  • Vegan, color-safe, cruelty-free

*Disclaimers

The K18 professional molecular repair hair mask is meant to be used as the second part of the K18REPAIR™ service.

With a color or chemical service:

  1. Before the service, apply K18 professional molecular repair hair mist. Wait 4 minutes. Do not rinse out.
  2. Apply 1-3 pumps of K18 professional molecular repair hair mask based on your client’s length and density, starting at the ends and working up towards the roots. Let sit for 4 minutes. Do not rinse out.
  3. Proceed with cut or style as usual.
  4. If toning, use K18 PRO mist first, wait 4 minutes, then apply toner directly over PRO mist. Process as usual. Rinse or shampoo toner + apply K18 PRO mask per instructions above.

Without a chemical service:

  1. Shampoo, do not condition. Towel-dry thoroughly
  2. Apply 1-3 pumps of K18 professional molecular repair hair mask based on your client’s length and density, starting at the ends and working up towards the roots.
  3. Let sit for 4 minutes. Do not rinse out.
  4. Proceed with cut or style as usual.

  • DO clarify before K18 if your client is a heavy product user (demineralize for mineral + metal buildup)
  • DO apply on clean, damp hair (think about 65% wet)
  • DO wait the full 4 minutes before combing or styling
  • DO add whatever styling products you love after the 4 minutes
  • 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

professional molecular repair mist 300mL

Rated 5.0 out of 5
Based on 167 reviews
First step of K18REPAIR™ service restores up to 99% elasticity pre-service Log In / REGISTER

PEPTIDE PREP™ pro chelating hair complex

Rated 4.9 out of 5
Based on 18 reviews
No-mix, spray-on demineralizing treatment Log In / REGISTER

Description

Made to be used as part of the K18REPAIR™ service (K18 PRO mist + K18 PRO mask)

This leave-in treatment mask repairs hair damage and restores hair to a healthy state after salon services. Powered by the K18PEPTIDE™ to reconnect broken polypeptide chains and disulfide bonds to renew strength and elasticity in just 4 minutes. This mask is clinically proven to repair damage from bleach* + color*, chemical services*, and heat* for immediate + lasting results. Cream-based format helps soften, smooth, and condition hair.

*Disclaimers

got questions?

Get started here

K18 is engineered to work with every hair type, in every service, and with every routine.

Traditional conditioners leave a film on hair 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 styling product.

Water in damp hair swells the cuticle (the outside layer of hair) to open the gates for our biomimetic peptide to enter and travel to the innermost layers of hair. If the gates aren’t open, the product will stay on the surface—giving you mostly superficial repair. By applying on damp hair, you can use less, waste less, and still get the best results.

Think of the K18 mask as a highly concentrated treatment. It restores hair’s strength + elasticity in the innermost layers of hair, instead of traditional conditioners that coat the outside of hair. After the 4-minute wait time post-K18 mask, feel free to add a leave-in for a boost of conditioning if needed.

Yes, both formulas are the same. The PRO mask is conveniently sized for PRO use.

healthier hair with every use

Reverse damage in 4 minutes with our breakthrough K18 molecular repair technology.
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how molecular repair compares

how K18 works

Traveling into the innermost layers of hair, our K18PEPTIDE™ renews strength along the width AND length of hair for lasting strength where it matters.

feel what's possible with K18

See how K18 unlocks our community's expression

reviews

average rating 4.8 out of 5
Based on 1708 reviews
  • 5 Stars
    1555 Reviews
  • 4 Stars
    90 Reviews
  • 3 Stars
    35 Reviews
  • 2 Stars
    8 Reviews
  • 1 Star
    20 Reviews
96% of reviewers would recommend this product to a friend
1708 Reviews
Reviewed by Susan V.
Verified Buyer
I recommend this product
Age
55 - 64
Hair Concern
  • Fragile/brittle hair
  • Heat damage
Hair Type
  • Fine/Thin
My Results
  • Soft Touchable Hair
  • Shinier Hair
  • Less Frizz
  • Visible Difference
Rated 5 out of 5
Review posted

Stunning

The best hair treatment that I just can not do without! The Molecular Repair Hair Mask has given my hair new life and looks fablous! Love this product, it is a must have!!

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Reviewed by Jordan J.
Verified Reviewer
I recommend this product
Age
25 - 34
Hair Concern
  • Color-care
  • Fragile/brittle hair
Hair Type
  • Curly/Coily
My Results
  • Less Breakage
  • Smoother Hair
  • Soft Touchable Hair
  • Cleaner, fresher hair
Rated 5 out of 5
Review posted

K18 Leave-in Hair Mask

After a few uses, I did see an improvement in the texture of my hair. It felt smoother, stronger, and more resilient, especially after heat styling or coloring. The product is lightweight and doesn't weigh down the hair, making it suitable even for finer hair types. It absorbs quickly without leaving any residue. Unlike traditional hair masks that require rinsing, this leave-in treatment is convenient and time-saving, especially for those with busy schedules. The biggest downside is the cost. For the size of the product, it’s quite expensive, which might not justify the results for everyone. While it does improve hair health over time, don’t expect miracles after just one or two uses. It’s more of a gradual repair process. The scent is mild and not unpleasant, but it may not be to everyone’s taste. Some might prefer a more fragrant product. The K18 Leave-In is a solid option for those looking to repair damaged hair, particularly from chemical treatments or heat styling. However, the high price point and the gradual nature of the results might make it a better investment for those who are committed to long-term hair health rather than expecting immediate transformation.

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K18Hair PRO

K18 is a progressive treatment and will aid in repairing the hair for lasting results. Thank you, Jordan, for your review!

Reviewed by Deirdre K.
Verified Buyer
I recommend this product
Age
55 - 64
Hair Concern
  • Dryness
  • Split-Ends
  • Frizz
Hair Type
  • Fine/Thin
  • Curly/Coily
My Results
  • Less Frizz
  • Visible Difference
  • Soft Touchable Hair
  • Shinier Hair
  • Defined Curl/Wave Pattern
Rated 5 out of 5
Review posted

Whoa!!

K18 has been a life saver for my hair. I use it once a week and my curls have never felt and looked better!! I’m hooked!

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K18Hair PRO

Bringing curly back! We appreciate your 5-star review!

Reviewed by Mercedez J.
Verified Buyer
I recommend this product
Age
18 - 24
Hair Concern
  • Heat damage
  • Color-care
  • Frizz
  • Split-Ends
  • Extending time between washes
Hair Type
  • Straight/Wavy
  • Thick/Coarse
  • Fine/Thin
  • Medium Density
My Results
  • Less Frizz
  • Smoother Hair
  • Soft Touchable Hair
  • Shinier Hair
  • Cleaner, fresher hair
Rated 5 out of 5
Review posted

Hair mask review

The repair mask leaves my hair smelling good and feeling good

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K18Hair PRO

​We love the scent as well! We appreciate your review!

Reviewed by Linh N.
Verified Buyer
I recommend this product
Age
45 - 54
Client Hair Concerns
  • Heat Damage
  • Color Care
  • Fragile/Brittle Hair
  • Chemical Damage
  • Dryness
Client Hair Types
  • Fine/Thin
  • Thick/Coarse
  • Straight/Wavy
  • Medium Density
  • Curly/Coily
Client Results
  • Less Frizz
  • Soft Touchable Hair
  • Smoother Hair
  • Stronger hair
  • Less Breakage
Rated 5 out of 5
Review posted

Most amazing mask ever

Great mask for all hair types. Really improves the quality. Must have for everyone that does chemical service.

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K18Hair PRO

We appreciate your review, Linh! Thank you for wanting the best for your clients!

Pro Distribution Partners

Hair professionals can shop wholesale at the following distributors. Professionals within the US will also be able to shop directly from K18hair.com starting early 2021! Check back again soon for updates as we continue to expand globally.



Questions? Email us at hello@k18hair.com

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
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