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Professional Molecular Repair Mask 150 mL (WHOLESALE)
Professional Molecular Repair Mask 150 mL (WHOLESALE)
Before and after using k18 professional leave in hair mask and professional hair mist.
Before and after using k18 professional leave in hair mask and professional hair mist.
Before and after using k18 professional leave in hair mask and professional hair mist.
Before and after using k18 professional leave in hair mask and professional hair mist.
Professional Molecular Repair Mask pump gif 150 mL
Curly hair before using K18 mask and curly hair after using K18 mask.
Professional Molecular Repair Mask 150 mL (WHOLESALE)
Professional Molecular Repair Mask 150 mL (WHOLESALE)
Professional Molecular Repair Mask 150 mL (WHOLESALE)
Professional Molecular Repair Mask 150 mL (WHOLESALE)
Professional Molecular Repair Mask 150 mL (WHOLESALE)
Before and after using k18 professional leave in hair mask and professional hair mist.
Before and after using k18 professional leave in hair mask and professional hair mist.
Before and after using k18 professional leave in hair mask and professional hair mist.
Before and after using k18 professional leave in hair mask and professional hair mist.
Professional Molecular Repair Mask pump gif 150 mL
Curly hair before using K18 mask and curly hair after using K18 mask.
Professional Molecular Repair Mask 150 mL (WHOLESALE)
Professional Molecular Repair Mask 150 mL (WHOLESALE)
Professional Molecular Repair Mask 150 mL (WHOLESALE)
4.9
Rated 4.9 out of 5 stars
2,265 Reviews
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professional molecular repair mask

Second step of K18REPAIR™ service reverses damage post-service

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description

Made to be used as part of the K18REPAIR™ 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*, and heat* for immediate + lasting results. Cream-based format helps soften, smooth, and condition hair.


*Disclaimers

Repairs Damage Caused By

Bleach + Color

Heat

Chemical Services

    • 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 before and 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

      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

      Clinically proven to reverse hair damage – from: bleach + color, chemical services, and heat

      *Disclaimers

    • 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 bleach, 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

      *Disclaimers

    • how to use

      The K18 professional molecular repair hair mask is meant to be used as the second part of the K18REPAIR™ service.

      With a color or chemical service:

      1. Before the service, apply K18 professional molecular repair hair mist. Wait 4 minutes. Do not rinse out.
      2. Apply 1-3 pumps of K18 professional molecular repair hair mask based on your client’s length and density, starting at the ends and working up towards the roots. Let sit for 4 minutes. Do not rinse out.
      3. Proceed with cut or style as usual.
      4. If toning, use K18 PRO mist first, wait 4 minutes, then apply toner directly over PRO mist. Process as usual. Rinse or shampoo toner + apply K18 PRO mask per instructions above.

      Without a chemical service:

      1. Shampoo, do not condition. Towel-dry thoroughly
      2. Apply 1-3 pumps of K18 professional molecular repair hair mask based on your client’s length and density, starting at the ends and working up towards the roots.
      3. Let sit for 4 minutes. Do not rinse out.
      4. Proceed with cut or style as usual.
    • ingredients

      Water (Aqua) (Eau), Alcohol Denat., Propylene Glycol, Cetearyl Alcohol, Dicaprylyl Ether, Cetyl Esters, Behentrimonium Chloride, Polysorbate 20, sh- Oligopeptide-78, Hydrolyzed Wheat Protein, Hydrolyzed Wheat Starch, Isopropyl Alcohol, Tocopherol, Phenoxyethanol, Potassium Sorbate, Citric Acid, Fragrance (Parfum), Geraniol, Linalool, Hexyl Cinnamal, Benzyl Alcohol, Amyl Salicylate, Benzaldehyde.

pairs well with
professional molecular repair mist 300mL
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Professional Molecular Repair Mask 150 mL (WHOLESALE)
Professional Molecular Repair Mask 150 mL (WHOLESALE)
Before and after using k18 professional leave in hair mask and professional hair mist.
Before and after using k18 professional leave in hair mask and professional hair mist.
Before and after using k18 professional leave in hair mask and professional hair mist.
Before and after using k18 professional leave in hair mask and professional hair mist.
Professional Molecular Repair Mask pump gif 150 mL
Curly hair before using K18 mask and curly hair after using K18 mask.
Professional Molecular Repair Mask 150 mL (WHOLESALE)
Professional Molecular Repair Mask 150 mL (WHOLESALE)
Professional Molecular Repair Mask 150 mL (WHOLESALE)
Professional Molecular Repair Mask 150 mL (WHOLESALE)
Professional Molecular Repair Mask 150 mL (WHOLESALE)
Before and after using k18 professional leave in hair mask and professional hair mist.
Before and after using k18 professional leave in hair mask and professional hair mist.
Before and after using k18 professional leave in hair mask and professional hair mist.
Before and after using k18 professional leave in hair mask and professional hair mist.
Professional Molecular Repair Mask pump gif 150 mL
Curly hair before using K18 mask and curly hair after using K18 mask.
Professional Molecular Repair Mask 150 mL (WHOLESALE)
Professional Molecular Repair Mask 150 mL (WHOLESALE)
Professional Molecular Repair Mask 150 mL (WHOLESALE)
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.

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.

soft, strong, bouncy hair for everyone

Repair damage for hair like new* in 4 minutes.

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after
"I have fallen in LOVE with this product and i haven’t had a single client disappointed"
- Sydne S.
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after
"I was so excited to try this stuff and then when I saw results instantly I knew I was in LOVE!!!"
- Shannon O.
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"Hands down the best product I’ve used to repair damaged hair. I live by this product and my clients love it too!"
- Nicole C.
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"This product is a game changer, especially for blondes! I have seen some of the most damaged hair become like new again! It’s a miracle! Ty K18!"
- Lacey P.
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"I absolutely love this product on my clients and myself!!! As a hairdresser, I’ve tried all those bond builders and what not and yes they are great but what sets k-18 apart from these other bond builders is that the technology behind it really goes deep into the hair. I have had many of my clients who had so many compliments about how healthy their hair looks and feels."
- Justina M.
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"This stuff stomps the yard! I cannot even fathom coloring or lightening hair, without K18. It’s in my prices and no one complains because their hair feels and looks amazing. The client below tried at home lightening and came in to have it fixed."
- Ryan H.
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"I’m currently in cosmetology school so of course all my family and friends want me to do their hair! Ive started using K18 on anyone i have to bleach and its like a little miracle!"
- Nicole M.
powered by K18PEPTIDE™

Biomimetic peptide clicks into hair’s keratin structure—the source of core strength—for soft, shiny, bouncy results that won’t wash away.

Explore the Science EXPLORE THE SCIENCE
see K18REPAIR™ in action
lightener / color
1. Section dry hair into 4 quadrants.

2. Apply a minimum of 10 full sprays of K18 professional molecular repair hair mist to each quadrant, increasing up to 20 sprays per quadrant as needed, depending on client’s length, density, or level of damage.

3. Wait 4 minutes (do not rinse out).

4. If needed, dry the hair prior to applying lightener or color. Then perform your desired technique.

5. Process your lightener or color as usual, then rinse and shampoo with K18 PEPTIDE PREP™ detox shampoo. Do not condition.

6. Apply 1-3 pumps of K18 professional molecular repair hair mask based on your client’s length and density, starting at the ends and working up towards the roots.

7. Wait 4 minutes (do not rinse), then apply 1-3 drops of K18 molecular repair hair oil to mid-lengths and ends.

8. Wait 4 minutes, then proceed with cut or style as usual.

9. Add an additional 1-3 drops of K18 molecular repair hair oil to dry hair as a finisher.

Please see the “K18 + toning or glossing” section for more information on toning with K18.
learn more on our blog
The Top K18 Mask FAQs
The Top K18 Mask FAQs
answering your most-asked questions.
about The Top K18 Mask FAQs
How much leave-in mask should you use?
/ products
How much leave-in mask should you use?
A handy dosage guide for every hair type, density, and length.
about How much leave-in mask should you use?
How to Build Your Clients’ Take-Home Routines with K18 Mask + DAMAGE SHIELD
/ business
How to Build Your Clients’ Take-Home Routines with K18 Mask + DAMAGE SHIELD
A PRO’s top tips for building your clients’ take-home routines
about How to Build Your Clients’ Take-Home Routines with K18 Mask + DAMAGE SHIELD
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4.9
Rated 4.9 out of 5 stars
Based on 2,265 reviews
97%would recommend these products
Customers Talked About
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2,265 reviews
  • Rocio R. U.
    Verified Buyer
    Reviewing
    Full-Size Leave-In Molecular Repair Hair Mask 50 mL (WHOLESALE)
    I recommend this product
    Age 25 - 34
    Hair Concern Chemical damage, Dryness, Split-Ends, Fragile/brittle hair, Extending time between washes
    Hair Type Medium Density
    My Results Less Frizz, Visible Difference, Stronger Hair, Less Breakage, Shinier Hair
    Rated 5 out of 5 stars
    2 days ago
    It works wonders

    I relax my hair so it is pretty damaged, I have used this 3 times and I already feel a difference. My hair feels stronger, it leaves your hair shiny and soft.

    Was this helpful?
    K18Hair PRO
    2 days ago

    Thank you so much for sharing, Rocio! We're thrilled to hear the Molecular Repair Hair Mask is making such a positive difference for your hair. We love knowing it's leaving your strands feeling stronger, shinier, and softer! 💕

  • Jill D.
    Verified Buyer
    Reviewing
    Full-Size Leave-In Molecular Repair Hair Mask 50 mL (WHOLESALE)
    I recommend this product
    Age 55 - 64
    Hair Concern Heat damage, Chemical damage, Frizz, Fragile/brittle hair
    Hair Type Thick/Coarse, Straight/Wavy
    My Results Visible Difference, Soft Touchable Hair, Less Breakage, Less Frizz, Stronger Hair
    Rated 5 out of 5 stars
    1 week ago
    Love this product!

    I have long, thick, bleached blonde hair. My best friend is a hair stylist, so I always use professional products and have always had beautiful blonde hair! However, I made the mistake of straightening it without a heat protector or leave in, because I was in a hurry one day and I literally fried my hair, because the straightener was on 450*! So I was told by my best friend to use the K18 hair repair mask, but I was hesitant because of the price of the small full size bottle. However ,I trust my hair stylist, so I purchased it. The first time using it I could feel and see a huge difference and I couldn’t believe it? I did have to use 4 pumps because of the length and thickness of my hair, but after 6 times using it in a row and after having a stem cell treatment done, my hair is back to Beautiful! I will definitely continue to incorporate this product into my weekly hair maintenance routine.

    Was this helpful?
    K18Hair PRO
    1 week ago

    Thank you so much for your review, Jill! 🤍 We're thrilled the Molecular Repair Hair Mask has helped restore your hair to beautiful after heat damage. We're so grateful for your trust and so happy you're making it part of your routine!

  • Yuliya B.
    Verified Buyer
    Reviewing
    Full-Size Leave-In Molecular Repair Hair Mask 50 mL (WHOLESALE)
    I recommend this product
    Age 45 - 54
    Hair Concern Color-care
    Hair Type Fine/Thin
    My Results Visible Difference, Less Breakage
    Rated 5 out of 5 stars
    1 week ago
    My Hair Feels So Much Healthier

    I’ve been using this hair mask for a while, and I’m really happy with the results. My hair has become more resilient and much less prone to breakage. It feels softer, smoother, and healthier, with a beautiful shine. My ends look more nourished, and my hair is much easier to brush after every use. I definitely recommend this mask, especially for damaged or color-treated hair. I’ll definitely buy it again!

    Was this helpful?
    K18Hair PRO
    1 week ago

    Thank you so much for your wonderful review! 🤍 We're thrilled to hear the Molecular Repair Hair Mask is delivering such amazing results for your hair. We truly appreciate you being part of the K18 community!

  • Deb M.
    Verified Buyer
    Reviewing
    Full-Size Leave-In Molecular Repair Hair Mask 50 mL (WHOLESALE)
    I recommend this product
    Age 45 - 54
    Hair Concern Chemical damage, Heat damage, Color-care, Dryness, Split-Ends
    Hair Type Fine/Thin
    My Results Less Frizz, Smoother Hair
    Rated 5 out of 5 stars
    3 weeks ago
    Magical!

    Love everything about this product

    Was this helpful?
    K18Hair PRO
    3 weeks ago

    Thank you so much for your amazing review! 💛 We're thrilled to hear you're loving our Full-Size Leave-In Molecular Repair Hair Mask. Your support means the world to us! ✨

  • Amrita S.
    Verified Buyer
    Reviewing
    Full-Size Leave-In Molecular Repair Hair Mask 50 mL (WHOLESALE)
    I recommend this product
    Age 25 - 34
    Hair Concern Heat damage, Chemical damage, Fragile/brittle hair
    Hair Type Fine/Thin
    My Results Stronger Hair, Less Breakage
    Rated 5 out of 5 stars
    3 weeks ago
    Instant difference

    I have very poor quality hair postpartum which break so often. I have used K18 and in a week the breakage has reduced substantially. I had also done keratin sometime ago and needless to say K18 is slowly overturning the damage.

    Was this helpful?
    K18Hair PRO
    3 weeks ago

    Thank you so much for your amazing review, Amrita! 💛 We're thrilled to hear the Leave-In Molecular Repair Hair Mask is helping reduce breakage and restore your hair's health. Here's to stronger, healthier hair days ahead! ✨

*Disclaimers