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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 4.9 out of 5
Based on 989 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, and chemical services—restoring strength, softness, smoothness, and bounce to hair.

11+ billion TikTok views 🔥 

Repairs Damage Caused By

  • Bleach + Color Bleach + Color
  • Heat Heat
  • Chemical Services Chemical Services

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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

  • 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

Just one application of the K18 molecular repair service (PRO mist + PRO mask) with a salon treatment brings your client’s hair back up to:

  • 91% original strength*

  • 94% original elasticity*

*k18hairpro.com/disclaimers

how to use

  1. Shampoo, do not condition
  2. Towel-dry thoroughly
  3. Begin with 1 pump and add more as needed. Maximum recommended usage is 3 pumps.
  4. Apply all over, 1 pump at a time
  5. Let sit for 4 minutes. Do not rinse out
  6. Comb, add product + style as usual
  7. Use for 4-6 washes, then as needed

how to optimize K18

  • 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.

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, and chemical services—restoring strength, softness, smoothness, and bounce to hair.

11+ billion TikTok views 🔥 

backed by science,
loved by stylists

Our community of stylists and colorists believe K18 is liberating hair—no matter the hair type or generation.

“K18 allows me to go everywhere I want to go with my color work and the end result is my guests get to be bright and shiny and healthy.”

– Christine Thompson, Director of Color at Spoke & Weal
pros using K18

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.

got questions?

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What is the K18 mask?

Peptide-powered treatment to repair damage from bleach, color, and chemical services. pH level of 5.0–6.0 helps close down the cuticle to seal in the K18PEPTIDE™ for renewed strength + elasticity.

what is the K18PEPTIDE™?

Our biomimetic peptide mimics hair’s natural structure to seamlessly fit in and reconnect broken keratin chains responsible for hair’s core strength and elasticity. As a result of this reconnection it also addresses cleaved disulfide bonds for connection along the Y-axis of hair AND the x-axis or width of hair.

Why skip conditioner?

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.

Why is there alcohol in the formula?

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 function to open the hair cuticle so the K18PEPTIDE™ can penetrate the innermost layer of hair, reaching the broken polypeptide chains (keratin chains).

How often do my clients use the K18 mask at home?

Clients can use the K18 mask for the next 4-6 washes at home, then as needed for a boost of strength, softness, smoothness, and bounce.
reviews
average rating 4.9 out of 5
Based on 989 reviews
  • 5 Stars
    912 Reviews
  • 4 Stars
    43 Reviews
  • 3 Stars
    18 Reviews
  • 2 Stars
    6 Reviews
  • 1 Star
    10 Reviews
97% of reviewers would recommend this product to a friend
Customer photos and videos
989 Reviews
Reviewed by Kristy F.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

Best product on the market

My hair has never felt so good!! Thank you K18!!

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K18Hair PRO

Thank you Kristy for your review!

Reviewed by Tamara W.
Verified Buyer
I recommend this product
Age
45 - 54
Hair Concern
  • Heat damage
Hair Type
  • Straight/Wavy
My Results
  • Smoother Hair
  • Shinier Hair
  • Less Breakage
  • Visible Difference
  • Stronger Hair
Rated 5 out of 5
Review posted

Amazing!

I love this product!! It really works. My hair is so soft and the ends needed some help! I don’t know how it works but it does!! It’s not cheap but it is worth every penny. I was skeptical at first. But said what the hell! Glad I did!!!

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K18Hair PRO

Thank you for your review!

Reviewed by Ingrid B.
Verified Buyer
I recommend this product
Age
65+
Hair Concern
  • Fragile/brittle hair
  • Dryness
  • Heat damage
  • Chemical damage
Hair Type
  • Fine/Thin
  • Grey Hair
My Results
  • Visible Difference
  • Less Breakage
  • Soft Touchable Hair
  • Shinier Hair
Rated 5 out of 5
Review posted

It works!

I only used it twice so far,but I can already see a difference in my hair.It looks and feels thicker and it is so soft.I have a ways to go,but I will definitely keep using this mask until my hair is as healthy as it used to be.

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K18Hair PRO

Thank you for your review Ingrid!

Reviewed by Dina O.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

Definitely works like magic!

My curls have been not up to par as I ran out of the k-18 mask and forgot to order more…they are back are looking like usual!

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K18Hair PRO

Thank you for your amazing review!

Reviewed by Jenifer C.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

Worth the hype

My hair looks & feels amazing. Did all it claimed!

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K18Hair PRO

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Professional Molecular Repair Mask 150 mL (WHOLESALE)
professional molecular repair mask
Rated 4.9 out of 5
Based on 989 reviews
Part of the K18 molecular repair service
View Professional Molecular Repair Mask 150 mL (WHOLESALE) product
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