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mini leave-in molecular repair hair mask

4-minute leave-in treatment to reverse hair damage
Rated 4.6 out of 5
Based on 7055 reviews

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.

11+ billion TikTok views 🔥 

*Disclaimers

Repairs Damage Caused By

  • Bleach + Color Bleach + Color
  • Heat Heat
  • Chemical Services Chemical Services
OR
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more to know

  • 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

key benefits

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

how to use

  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

dos and don'ts

  • 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

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 OilMolecular Repair Hair Oil

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Rated 4.8 out of 5
Based on 207 reviews
Weightless oil that strengthens, repairs damage + reduces frizz View Molecular Repair Hair Oil product
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PEPTIDE PREP™ detox shampoo

Rated 4.7 out of 5
Based on 115 reviews
Color-safe, non-stripping clarifying shampoo with the K18PEPTIDE™ View PEPTIDE PREP™ detox shampoo 8.5oz product

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.

11+ billion TikTok views 🔥 

*Disclaimers
Image Comparison Drag Handle
see molecular repair in action
The K18 leave-in molecular repair hair mask delivers lasting + progressive results, for healthier hair with each use.

the experts know

Groundbreaking PRO stylists, scientists + beauty experts have unlocked new levels of expression with K18 molecular repair.

got questions?

Get started here.

how does the k18 mask work?

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.

what is the k18peptide™?

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*
*Disclaimers

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.

i noticed there’s alcohol in the formula, isn’t that bad for you?

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).

when should i expect to see results?

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.
reviews
average rating 4.6 out of 5
Based on 7055 reviews
  • 5 Stars
    5757 Reviews
  • 4 Stars
    666 Reviews
  • 3 Stars
    291 Reviews
  • 2 Stars
    136 Reviews
  • 1 Star
    205 Reviews
92% of reviewers would recommend this product to a friend
Customer photos and videos
7055 Reviews
Reviewed by Mary Melissa H.
Verified Buyer
I recommend this product
Age
55 - 64
Hair Concern
  • Frizz
  • Dryness
Hair Type
  • Straight/Wavy
  • Medium Density
My Results
  • Less Frizz
  • Smoother Hair
  • Shinier Hair
  • Soft Touchable Hair
Rated 5 out of 5
Review posted

Long frizzy hair

My hair stylist used this on my hair and it turned out so smooth and soft. Of course I had to buy it and try it at home. I can never get it as smooth as he does but with this product you’d think I’d been to the salon. Amazing results.

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K18Hair

Thank you Mary Melissa for your review!

Reviewed by Aaron M.
Verified Buyer
I recommend this product
Age
25 - 34
Hair Concern
  • Chemical damage
Hair Type
  • Medium Density
My Results
  • Bouncy Hair
Rated 5 out of 5
Review posted

great

great

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K18Hair

Thank you for your review!

Reviewed by Laura s.
Verified Buyer
Age
55 - 64
Hair Concern
  • Color-care
  • Frizz
  • Fragile/brittle hair
  • Chemical damage
  • Dryness
Hair Type
  • Straight/Wavy
  • Grey Hair
  • Medium Density
Rated 3 out of 5
Review posted

Still waiting for results

I really want this to work. Maybe it does and my hair would be REALLY bad without it. I wash every 3 days using k18 maintenance shampoo, k18 mask, and k18 oil. Day of service photo, and today photo. You decide.

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K18Hair

Thank you for your review Laura. Reach out to us with any questions to Hello@K18hair.com.

Reviewed by Linda D.
Verified Buyer
I recommend this product
Age
35 - 44
Hair Concern
  • Chemical damage
  • Heat damage
  • Color-care
  • Frizz
  • Fragile/brittle hair
Hair Type
  • Thick/Coarse
My Results
  • Less Frizz
  • Bouncy Hair
  • Visible Difference
  • Stronger Hair
  • Less Breakage
Rated 5 out of 5
Review posted

Big Difference

I have noticed a big difference in such little time. I use it daily; a small amount goes a long way. Worth it! I will repurchase it. Co-workers noticed it and asked me, what I am using on my hair, so it is noticeable I wish I would have taken a before picture.

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K18Hair

My favorite is when others notice! Thank you for your review Linda!

Reviewed by Jason H.
Verified Buyer
I recommend this product
Age
25 - 34
Hair Concern
  • Fragile/brittle hair
Hair Type
  • Medium Density
My Results
  • Soft Touchable Hair
  • Less Breakage
Rated 5 out of 5
Review posted

New Favorite

Wow yeah I love it. Hair - so soft.

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K18Hair

Yay for soft hair! Thank you for your review!

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