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mini leave-in molecular repair hair mask

Mini retail size of our 4-minute leave-in treatment to reverse hair damage
Rated 4.8 out of 5
Based on 1522 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 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 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 253 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 182 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 1522 reviews
  • 5 Stars
    1383 Reviews
  • 4 Stars
    81 Reviews
  • 3 Stars
    32 Reviews
  • 2 Stars
    8 Reviews
  • 1 Star
    18 Reviews
96% of reviewers would recommend this product to a friend
Customer photos and videos
1522 Reviews
Reviewed by Rita G.
Verified Buyer
I recommend this product
Age
65+
Hair Concern
  • Chemical damage
  • Split-Ends
  • Color-care
  • Frizz
Hair Type
  • Medium Density
My Results
  • Less Frizz
  • Bouncy Hair
  • Visible Difference
  • Stronger Hair
  • Shinier Hair
Rated 5 out of 5
Review posted

Amazing!

All I can say is AMAZING. I am skeptical about hair products that promise but my hairdresser in NYC recommended it and he was right! My over processed hair is now like silk. I use it after anything I have done to my hair and then once a week or so to maintain. I will repeat AMAZING!

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Reviewed by Katiuska G.
Verified Buyer
I recommend this product
Age
55 - 64
Hair Concern
  • Color-care
  • Frizz
Hair Type
  • Medium Density
  • Straight/Wavy
My Results
  • Stronger Hair
  • Defined Curl/Wave Pattern
  • Smoother Hair
  • Soft Touchable Hair
  • Cleaner, fresher hair
Rated 5 out of 5
Review posted

My hair is more healthy

Leave my hair more healthy, no frizz!

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K18Hair PRO

Thank you Katiuska! We appreciate your review!

Reviewed by Lisa W.
Verified Buyer
I recommend this product
Age
55 - 64
Hair Concern
  • Fragile/brittle hair
  • Dryness
  • Chemical damage
  • Color-care
Hair Type
  • Straight/Wavy
My Results
  • Stronger Hair
  • Defined Curl/Wave Pattern
Rated 5 out of 5
Review posted

Helps repair!

This product has done a great job of repairing my hair. My hair has better curl and is not dry. I also use this before a salon visit for color to help protect my hair. I would definitely recommend!

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K18Hair PRO

Yay for hydrated curls! Thank you for your review!

Reviewed by Kerry K.
Verified Buyer
I recommend this product
Age
45 - 54
Hair Concern
  • Chemical damage
  • Frizz
  • Dryness
Hair Type
  • Medium Density
  • Straight/Wavy
My Results
  • Less Frizz
  • Smoother Hair
  • Soft Touchable Hair
  • Shinier Hair
  • Cleaner, fresher hair
Rated 5 out of 5
Review posted

Molecular Mask

OH MY WORD!! The amount of smoothness and silliness this creates! Even on my bleached hair! At first you won't feel it, but then when you brush it through.... WOW!!!

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K18Hair PRO

Thank you Kerry! Love your hair!

Reviewed by Dona L.
Verified Buyer
I recommend this product
Age
35 - 44
Hair Concern
  • Color-care
  • Chemical damage
  • Split-Ends
Hair Type
  • Fine/Thin
My Results
  • Bouncy Hair
  • Visible Difference
  • Cleaner, fresher hair
  • Defined Curl/Wave Pattern
  • Stronger Hair
Rated 5 out of 5
Review posted

Miracle product.

Heads up everyone…..I bought a product from an AMAZON company that claimed to be K18 but was a fake. Only buy it from the K18 website.

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K18Hair PRO

Thank you Dona! We appreciate your review!

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