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professional molecular repair mask

part of the K18 PRO Service
Rated 4.9 out of 5
Based on 762 reviews
150 mL
This leave-in treatment mask does cleanup duty after damage caused during bleaching, chemical services, and heat. Powered by the K18PEPTIDE™ to reconnect broken polypeptide chains and disulfide bonds to renew strength and elasticity in just 4 minutes.

11+ billion TikTok views 🔥

Repairs Damage Caused By

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

Professional Only

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more to know

The K18PEPTIDE™ works at the innermost layer of hair, reconnecting polypeptide chains and disulfide bonds broken during bleaching, chemical services, and through heat damage. By addressing these damage sites at the innermost layer of hair, core strength and elasticity are renewed for strong, smooth, bouncy hair—even after the most extreme damage done in the salon.

pH level of 5.0-6.0 helps close down the cuticle to seal in the K18PEPTIDE™ for lasting strength + elasticity.

Damage is ongoing

Send the K18 retail sizes home with your client to maintain hair strength and elasticity in between salon appointments with at-home molecular repair.

key benefits

  • Powered by the patented K18PEPTIDE™, engineered over 10 years in a biotech lab to work on the molecular level to rebuild hair from the inside out in just 4 minutes.

  • Because the K18PEPTIDE™ works at the molecular level, it works on every single hair type

  • Clinically proven to reverse hair damage from: Bleach + Color, Chemical Services, Heat

  • Restores strength, softness, smoothness, and bounce

  • Immediate + progressive results

  • Vegan, color-safe, cruelty-free

  • With just one salon treatment using the K18 PRO service (PRO mist + PRO mask), hair is restored up to:

91% original strength*
94% original elasticity*

*Results observed in a clinical study while using mist and mask as part of a bleaching treatment. Results may vary depending on hair type, quality, and history.

how to use

  1. Shampoo, do not condition.
  2. Towel-dry thoroughly.
  3. Begin with 1 pump of K18 PRO mask and add more as needed depending on length, thickness, and condition. Work evenly into hair from ends to roots, one pump at a time, maximum dosage is 3 pumps.
  4. Let sit for 4 minutes. Do not rinse out.
  5. Style as usual.
  6. If cutting, you may start right away. If toning, use K18 PRO mask first, then apply toner directly over top. Process as usual. Rinse or shampoo toner + reapply K18 PRO mask per instructions above.

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 (think about 65% wet)
  • 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

This leave-in treatment mask does cleanup duty after damage caused during bleaching, chemical services, and heat. Powered by the K18PEPTIDE™ to reconnect broken polypeptide chains and disulfide bonds to renew strength and elasticity in just 4 minutes.

11+ billion TikTok views 🔥

backed by science,
loved by stylists

Our community of stylists and colorists in 33 countries believe K18 is liberating hair—no matter the hair type or generation.

Reverse damage & reestablish curl pattern on dry, coarse hair with K18 Mask.
Bring brittle aging hair back to its youthful state with K18 Mask & Mist.
Protect the strength & integrity of hair during an extreme color transformation with K18 Mist & Mask.
Restore & strengthen hair with K18 Mist & Mask during highlights service.
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?

Get started here

who is k18 mask for?

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

Will using toner on top of K18 mask affect my client’s color?

K18 will not interfere with toner or final color. Colorists tell us K18 mask delivers a more uniform, and vibrant color application, as it evens out the hair’s porosity and damage.

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 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.
reviews
average rating 4.9 out of 5
Based on 762 reviews
  • 5 Stars
    720 Reviews
  • 4 Stars
    24 Reviews
  • 3 Stars
    9 Reviews
  • 2 Stars
    4 Reviews
  • 1 Star
    5 Reviews
98% of reviewers would recommend this product to a friend
Customer photos and videos
762 Reviews
Reviewed by Vanessa C.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

Amazing!!

I used this before introducing it to my clients, I love it! I have straight, flat hair and it did not weigh it down at all. I used it after the detox shampoo, usually I wash every other day but I was able to go an extra day before washing again. One of my clients sent me a text after leaving the salon, she loved how it made her hair feel!

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K18Hair PRO

Love the text message your client sent you! Thank you for your awesome review Vanessa!

Reviewed by Brandy S.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

Love

I am obsessed now!!!! Definitely love it and I don't think ill ever be without it again.

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K18Hair PRO

Thank you for your review Brandy.

Reviewed by Kamie D.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

Love k18

This is the best product I have ever used!!!! Love it

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K18Hair PRO

Thank you for your review Kamie.

Reviewed by Jennifer M.
Verified Buyer
I don't recommend this product
Rated 1 out of 5
Review posted

So disappointed

I really wanted to love this. Even gave it 3 tries. It leaves my hair tangled and dry, and feeling like straw. I followed the directions, but I just hate it

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K18Hair PRO

Thank you for your review Jennifer. We want you to have the best possible experience with K18 if you're open to it please reach out to us at hello@k18hair.com.

Reviewed by REBECCA L.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

The best out there!

So, I'm a cosmetologist.. I always like to test products on myself before I use it on clients.. Me, ,being a stylist I do a LOT to my hair, aka I torture it by changing it up constantly, so there was damage.. After using K-18, I can definitely without a doubt say that this product has healed my delicate strands like nothing I've ever used.. I will proudly use this on my clients.. Why? We ALL want healthy hair!

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K18Hair PRO

Thank you for your review Rebecca.

recommended products

Calculating…

based on your client + service

DOSAGE CALCULATION

pre-service

Apply a generous amount to damp hair, section by section

post-service

3 pumps
throughout the hair

How to use

  • Prep hair by lightly misting with water.
  • Apply K18 Mist section by section.
  • Wait 4 minutes. DO NOT rinse. (This is a good time to mix or prepare for your Lightening Service.)
  • Apply Lightener directly on top of K18 Mist. (Dry hair if needed prior to application.)
  • Process as usual.
  • Shampoo hair. Skip the conditioner.
  • Towel dry thoroughly.
  • Apply K18 Mask.
  • Leave for 4 minutes before styling. DO NOT rinse out.
  • If toning, apply toner / gloss on top of K18 Mask. Process toner / gloss as required. Shampoo and rinse. Towel dry thoroughly. Follow with secondary application of K18 Mask for 4 minutes.
  • Style as usual.

client recommendation

At-Home Treatment

Leave in Molecular Hair Repair Mask

2 pumps

Use for the first 4-6 washes, then every 3-4 washes for ongoing damage repair.

optimize K18

skip the conditioner

Conditioners coat hair making it harder for our K18Peptide™ to effectively penetrate strands and get into the inner layers of hair. We like to skip it so the peptide can get right to damage sites without interruption. If strands need a little more love, you can add a leave-in conditioner once the initial 4-minute wait period is over.

clarify first

Excessive product or mineral buildup on hair can prevent our K18Peptide™ from effectively penetrating strands. If hair is heavy with buildup, start with a clarifying treatment before using K18 to remove residue that may block our peptide from getting where it needs to go.

continue use

Damage is ongoing, so clients' use of K18 should be too. This progressive treatment makes hair healthier with each use. Continue their hair renewal at home by using K18 for the first 4-6 washes, then every 3-4 washes to maintain the integrity of damaged hair.

less is more

Our Pro Mask is highly concentrated, meaning a little goes a long way. Don’t oversaturate hair and refer to our dosage chart to find the optimal amount for each client’s hair type and service.

more is more

When using the Pro Mist, the more the merrier to reset damage before a chemical service. Use pre-service for a healthy canvas by applying a generous amount of the Pro Mist to damp hair, section by section.

made for all

K18 Pro Mist + Mask are compatible with all products and all hair types regardless of texture, generation, or level of damage.

optimize K18

clarify first

Excessive product or mineral buildup on hair can prevent our K18Peptide™ from effectively penetrating strands. If hair is heavy with buildup, start with a clarifying treatment before using K18 to remove residue that may block our peptide from getting where it needs to go.

more is more

When using the Pro Mist, the more the merrier to reset damage before a chemical service. Use pre-service for a healthy canvas by applying a generous amount of the Pro Mist to damp hair, section by section.

made for all

K18 Pro Mist + Mask are compatible with all products and all hair types regardless of texture, generation, or level of damage.

optimize K18

clarify first

Excessive product or mineral buildup on hair can prevent our K18Peptide™ from effectively penetrating strands. If hair is heavy with buildup, start with a clarifying treatment before using K18 to remove residue that may block our peptide from getting where it needs to go.

continue use

Damage is ongoing, so clients' use of K18 should be too. This progressive treatment makes hair healthier with each use. Continue their hair renewal at home by using K18 for the first 4-6 washes, then every 3-4 washes to maintain the integrity of damaged hair.

more is more

When using the Pro Mist, the more the merrier to reset damage before a chemical service. Use pre-service for a healthy canvas by applying a generous amount of the Pro Mist to damp hair, section by section.

made for all

K18 Pro Mist + Mask are compatible with all products and all hair types regardless of texture, generation, or level of damage.

optimize K18

skip the conditioner

Conditioners coat hair making it harder for our K18Peptide™ to effectively penetrate strands and get into the inner layers of hair. We like to skip it so the peptide can get right to damage sites without interruption. If strands need a little more love, you can add a leave-in conditioner once the initial 4-minute wait period is over.

clarify first

Excessive product or mineral buildup on hair can prevent our K18Peptide™ from effectively penetrating strands. If hair is heavy with buildup, start with a clarifying treatment before using K18 to remove residue that may block our peptide from getting where it needs to go.

continue use

Damage is ongoing, so clients' use of K18 should be too. This progressive treatment makes hair healthier with each use. Continue their hair renewal at home by using K18 for the first 4-6 washes, then every 3-4 washes to maintain the integrity of damaged hair.

less is more

Our Pro Mask is highly concentrated, meaning a little goes a long way. Don’t oversaturate hair and refer to our dosage chart to find the optimal amount for each client’s hair type and service.

made for all

K18 Pro Mist + Mask are compatible with all products and all hair types regardless of texture, generation, or level of damage.

K18 Pro Dosage Calculator ×
×

Send this to your client!

Your K18 Hair at-home treatment recommendation is of leave-in molecular repair hair mask for the first 4-6 washes, then every 3-4 washes for ongoing damage repair. For more information on the product and how to use, visit k18hair.com!

Pro Distribution Partners

Hair professionals can shop wholesale at the following distributors. Professionals within the US will also be able to shop directly from K18hair.com starting early 2021! Check back again soon for updates as we continue to expand globally.



Questions? Email us at hello@k18hair.com

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
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