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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 1484 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

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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 243 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 175 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.
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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.

reviews

average rating 4.8 out of 5
Based on 1484 reviews
  • 5 Stars
    1349 Reviews
  • 4 Stars
    80 Reviews
  • 3 Stars
    31 Reviews
  • 2 Stars
    8 Reviews
  • 1 Star
    16 Reviews
96% of reviewers would recommend this product to a friend
Customer photos and videos
1484 Reviews
Reviewed by Abeer A.
Verified Buyer
I recommend this product
Age
25 - 34
Hair Concern
  • Heat damage
Hair Type
  • Medium Density
My Results
  • Stronger Hair
  • Shinier Hair
  • Soft Touchable Hair
  • Less Breakage
  • Visible Difference
Rated 5 out of 5
Review posted

Very effective

I’m in love with k18 products !! Very effective and you can definitely see results from the very first use!

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K18Hair PRO

We love being effective and even better when you can noticed with one use! Thank you Abeer for your review!

Reviewed by Suzanne R.
Verified Buyer
I recommend this product
Age
45 - 54
Hair Concern
  • Frizz
  • Split-Ends
  • Chemical damage
  • Color-care
Hair Type
  • Fine/Thin
  • Straight/Wavy
My Results
  • Less Frizz
  • Shinier Hair
  • Visible Difference
  • Smoother Hair
  • Soft Touchable Hair
Rated 5 out of 5
Review posted

Love K18!

It’s so good and the only thing that actually makes a difference in my hair. My hair has never been so smooth, soft and shiny!

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K18Hair PRO

Thank you Suzanne! Enjoy your soft and shiny hair!

Reviewed by Melissa E.
Verified Buyer
I recommend this product
Age
45 - 54
Hair Concern
  • Color-care
  • Frizz
Hair Type
  • Curly/Coily
My Results
  • Less Frizz
  • Bouncy Hair
  • Stronger Hair
  • Shinier Hair
  • Soft Touchable Hair
Rated 5 out of 5
Review posted

Love it!!

This is a hair miracle! I have been using it for a few months now, and K18 leaves my hair shiny, less frizzy, more voluminous, and healthier all around.

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K18Hair PRO

Thank you for your review, Melissa!

Reviewed by Mandy P.
Verified Buyer
I recommend this product
Age
45 - 54
Client Hair Concerns
  • Chemical Damage
  • Fragile/Brittle Hair
  • Heat Damage
  • Color Care
  • Dryness
Client Hair Types
  • Medium Density
  • Straight/Wavy
Client Results
  • Visible Difference
  • Stronger hair
Rated 5 out of 5
Review posted

Mlp00

Damaged highlights looked much healthier after just 1 use

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K18Hair PRO

Thank you for your review, Mandy!

Reviewed by Andrea H.
Verified Buyer
I recommend this product
Age
35 - 44
Hair Concern
  • Color-care
  • Frizz
  • Dryness
Hair Type
  • Fine/Thin
My Results
  • Less Frizz
  • Stronger Hair
  • Smoother Hair
  • Shinier Hair
  • Visible Difference
Rated 5 out of 5
Review posted

Best hair mask EVER!

This hair mask makes me love my hair. Helps frizz and looks so healthy ❤️

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K18Hair PRO

Thank you for your review, Andrea!

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