Free Standard Shipping on $125+ Orders
free returns. buy with confidence

full-size leave-in molecular repair hair mask

Retail size of our 4-minute leave-in treatment to reverse hair damage
Rated 4.8 out of 5
Based on 1549 reviews

A retail-sized version of the K18 mask helps to maintain your client's hair strength and elasticity in-between salon appointments. This leave-in treatment mask for all hair types that reverses damage in 4 minutes. Patented peptide technology works to repair damage from bleach + color, chemical services, and heat* — restoring strength, softness, smoothness, and bounce to hair.

20+ billion TikTok views 🔥 

*Disclaimers

Repairs Damage Caused By

  • Bleach + Color
  • Heat
  • Chemical Services

Professional Only

Log In / REGISTER

Every purchase supports K18 x Plastic Bank efforts to radically simplify waste.
In 2023 we stopped147 Metric tons of plastic
=
7.3M+ single-use plastic bottles from reaching the ocean

more to know

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 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 and with every service

key benefits

  • 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, 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

how to use

  1. Shampoo, do not condition. Towel-dry thoroughly
  2. Apply 1-3 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

dos and don'ts

  • DO clarify before K18 if your client is 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
  • 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

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.

pairs well with

molecular repair hair oil

Rated 4.8 out of 5
Based on 263 reviews
Weightless oil that strengthens, repairs damage + reduces frizz View Molecular Repair Hair Oil (WHOLESALE) product Log In / REGISTER

PEPTIDE PREP™ detox shampoo

Rated 4.8 out of 5
Based on 186 reviews
Retail size of our color-safe, non-stripping clarifying shampoo formulated with the K18PEPTIDE™ View PEPTIDE PREP™ detox shampoo 8.5oz (WHOLESALE) product Log In / REGISTER

Description

A retail-sized version of the K18 mask helps to maintain your client's hair strength and elasticity in-between salon appointments. This leave-in treatment mask for all hair types that reverses damage in 4 minutes. Patented peptide technology works to repair damage from bleach + color, chemical services, and heat* — restoring strength, softness, smoothness, and bounce to hair.

20+ billion TikTok views 🔥 

*Disclaimers

got questions?

Get started here

who is it for?

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

why skip conditioner?

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.

why do I use K18 mask on towel-dried hair?

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.

does K18 mask replace conditioner?

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.

Is the K18 pro mask and take-home mask the same?

Yes, both formulas are the same. The PRO mask is conveniently sized for PRO use.
Image Comparison Drag Handle
healthier hair with every use
Reverse damage in 4 minutes with our breakthrough K18 molecular repair technology.
shopping with us has its perks

exclusive tools

Get access to monthly live training, professional education, and business guides.

free shipping on $125+ orders

Shop K18 at professional wholesale pricing (no order minimums here).

real support

We have K18 experts on standby to answer allll your product and order questions.

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.

reviews

average rating 4.8 out of 5
Based on 1549 reviews
  • 5 Stars
    1408 Reviews
  • 4 Stars
    81 Reviews
  • 3 Stars
    34 Reviews
  • 2 Stars
    8 Reviews
  • 1 Star
    18 Reviews
96% of reviewers would recommend this product to a friend
Customer photos and videos
1549 Reviews
Reviewed by Diane B.
Verified Buyer
I recommend this product
Age
55 - 64
Hair Concern
  • Chemical damage
  • Color-care
  • Frizz
  • Fragile/brittle hair
  • Dryness
Hair Type
  • Fine/Thin
My Results
  • Less Breakage
  • Defined Curl/Wave Pattern
  • Less Frizz
Rated 5 out of 5
Review posted

Awesome

Way better than olaplex. It's pricey though.

Loading...
Was this helpful?

K18Hair PRO

Thank you for your review!

Reviewed by Cindy T.
Verified Buyer
I recommend this product
Age
45 - 54
Hair Concern
  • Chemical damage
  • Heat damage
  • Frizz
Hair Type
  • Thick/Coarse
My Results
  • Less Frizz
  • Bouncy Hair
  • Visible Difference
  • Stronger Hair
  • Shinier Hair
Rated 5 out of 5
Review posted

Amazing Mask!

This is a literal lifesaver. My hair is getting happier and healthier by the day! I am very impressed!

Loading...
Was this helpful?

K18Hair PRO

Thank you Cindy for your review!

Reviewed by OYUNSUREN C.
Verified Buyer
I recommend this product
Age
35 - 44
Hair Concern
  • Split-Ends
  • Chemical damage
  • Fragile/brittle hair
  • Oily hair/scalp
  • Frizz
Hair Type
  • Medium Density
  • Straight/Wavy
My Results
  • Smoother Hair
  • Soft Touchable Hair
Rated 5 out of 5
Review posted

Good product

Good product

Loading...
Was this helpful?

K18Hair PRO

Thank you for your 5 star review!

Reviewed by Jennifer H.
Verified Buyer
I recommend this product
Age
45 - 54
Hair Concern
  • Fragile/brittle hair
  • Chemical damage
  • Dryness
Hair Type
  • Fine/Thin
My Results
  • Visible Difference
  • Less Breakage
  • Soft Touchable Hair
  • Defined Curl/Wave Pattern
Rated 5 out of 5
Review posted

Great product

Finally found a product that makes my fine thin color treated hair look and feel soft and healthy.

Loading...
Was this helpful?

K18Hair PRO

We appreciate your review Jennifer!

Reviewed by Juliana M.
Verified Buyer
I recommend this product
Age
35 - 44
Client Hair Concerns
  • Split Ends
  • Heat Damage
  • Fragile/Brittle Hair
Client Hair Types
  • Fine/Thin
  • Medium Density
Client Results
  • Less Frizz
  • Visible Difference
  • Stronger hair
  • Cleaner, fresher hair
Rated 5 out of 5
Review posted

Best Product Ever Made!

Visible results, healthier, shinier, cleaner hair. Simply amazing!!

Loading...
Was this helpful?

K18Hair PRO

Thank you for your review Juliana!

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
Blackfire Tracking
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.