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professional molecular repair mask

Part of the K18 molecular repair service
Rated 4.9 out of 5
Based on 989 reviews
150 mL

Made to be used as part of the K18 molecular repair service (K18 PRO mist + K18 PRO mask)

This leave-in treatment mask repairs hair damage and restores hair to a healthy state after salon services. Powered by the K18PEPTIDE™ to reconnect broken polypeptide chains and disulfide bonds to renew strength and elasticity in just 4 minutes, this mask is clinically proven to repair damage from bleach, color, chemical services in 4 minutes for immediate + lasting results. Cream-based format helps soften and detangle.

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 after color and chemical services - 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*

*Disclaimers

how to use

The K18 molecular repair PRO mask is meant to be used as the second part of the K18 molecular repair service.

With a color or chemical service:

  1. Before the service, apply K18 PRO mist. Wait 4 minutes. Do not rinse out.
  2. Apply K18 PRO mask. Begin with 1 pump and add more as needed. Maximum recommended usage is 3 pumps.
  3. Let sit for 4 minutes. Do not rinse out.
  4. Style as usual.
  5. If cutting, you may start right away.
  6. If toning, use K18 PRO mask first, wait 4 minutes, then apply toner directly over mask. Process as usual. Rinse or shampoo toner + reapply K18 PRO mask per instructions above.

Without a chemical service:

  1. Shampoo, do not condition.
  2. Towel-dry thoroughly.
  3. Apply K18 PRO mist. Wait 4 minutes. Do not rinse out.
  4. Apply K18 PRO mask.
  5. Begin with 1 pump and add more as needed. Maximum recommended usage is 3 pumps.
  6. Apply all over, 1 pump at a time
  7. Let sit for 4 minutes. Do not rinse out.
  8. Comb, add product + style as usual.

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

Made to be used as part of the K18 molecular repair service (K18 PRO mist + K18 PRO mask)

This leave-in treatment mask repairs hair damage and restores hair to a healthy state after salon services. Powered by the K18PEPTIDE™ to reconnect broken polypeptide chains and disulfide bonds to renew strength and elasticity in just 4 minutes, this mask is clinically proven to repair damage from bleach, color, chemical services in 4 minutes for immediate + lasting results. Cream-based format helps soften and detangle.

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.

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Who is it 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 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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recommended products

Full-Size Leave-In Molecular Repair Hair Mask 50 mL (WHOLESALE)
full-size leave-in molecular repair hair mask
Rated 4.9 out of 5
Based on 989 reviews
Retail size of our 4-minute leave-in treatment to reverse hair damage
View Professional Molecular Repair Mist 300 mL (WHOLESALE) product
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