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mini size leave-in molecular repair hair mask 15mL
1. patented peptide reverses damage 2. highly concentrated formula 3. for all hair types 4. works in 4 minutes 5. easy leave-in, no rise needed 6. vegan & cruelty-free
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.
Biotech-powered K18PEPTIDE(TM) reverses hair damage in 4 minutes. Straight hair after bleach without K18and straight hair after bleach with K18.
highly concentrated formula = a little goes a long way
Before and after image using detox, mask, conditioner, and oil
full size leave in mask- start with 1 pump add more as needed. Mini size mask- start with 3 pumps add more as needed.
Clinically proven to reverse damage from: bleach + color, chemical services, and heat.
Where does K18 fit into your routine? 1. Shampoo (skip conditioner) 2. Towel dry 3. K18 4. wait for minutes 5. everything else
4.9
Rated 4.9 out of 5 stars
1,909 Reviews

mini leave-in molecular repair hair mask

Mini retail size of our 4-minute leave-in treatment to reverse hair damage

Professional Only

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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

Repairs Damage Caused By

  • Bleach + Color
  • Heat
  • Chemical Services
  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

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

  • 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

  • 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

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
4.8
Rated 4.8 out of 5 stars
406 Reviews
Weightless oil that strengthens, repairs damage + reduces frizz Log In / REGISTER
PEPTIDE PREP™ detox shampoo
4.8
Rated 4.8 out of 5 stars
252 Reviews
Retail size of our color-safe, non-stripping clarifying shampoo formulated with the K18PEPTIDE™ 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
K18 is engineered to work with every hair type, in every service, and with every routine.
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.
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.
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.
Yes, both formulas are the same. The PRO mask is conveniently sized for PRO use.

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.

feel what's possible with K18
See how K18 unlocks our community's expression
4.9
Rated 4.9 out of 5 stars
Based on 1,909 reviews
1,909 reviews
  • Karen M.
    Verified Buyer
    Reviewing
    Full-Size Leave-In Molecular Repair Hair Mask 50 mL (WHOLESALE)
    I recommend this product
    Age 35 - 44
    Hair Concern Dryness, Split-Ends, Fragile/brittle hair, Chemical damage, Heat damage
    Hair Type Fine/Thin
    My Results Visible Difference, Less Frizz, Less Breakage, Stronger Hair, Smoother Hair
    Rated 5 out of 5 stars
    3 days ago
    Love it

    My hair is extremely thin and fine and has tons of damage and breakage. My ends were like straw. I decided to try this based on Abby's recommendation from YouTube. I used it 4 times in a row and now use it once a week. I do think I'm seeing results as my ends are looking better. It's expensive but a little goes a long way and while it's still a little early, I'd say it's worth it. Before and after pic included.

    K18Hair PRO
    Yesterday

    Thank you Karen! Yes less is more!

  • Fee B.
    Verified Reviewer
    Reviewing
    Full-Size Leave-In Molecular Repair Hair Mask 50 mL (WHOLESALE)
    I recommend this product
    Age 25 - 34
    Hair Concern Split-Ends, Dryness, Frizz, Color-care, Chemical damage
    Hair Type Medium Density, Straight/Wavy
    My Results Less Frizz, Visible Difference, Smoother Hair, Soft Touchable Hair, Shinier Hair
    Rated 5 out of 5 stars
    1 week ago
    AAMAZING!!!! AAMMAAZZIINNGGG!!!!!!!!! AAMMAZZINNGGGG!!!!!!

    I was honestly very scared to use, especially not rinsing and conditioning. Because usually other products have you wait 10 minutes and rinse and condition. All my other products I WILL BE THROWING AWAY!!!!!! THIS PRODUCT IS A MUST HAVE. Last night was my first time using it.. i have DEFINITELY NOTICED A BIG CHANGE in my bleached hair with one use!!! I first used the Damage K18 shampoo, then 2 pumps of this GOD SENT PRODUCT LEAVE IN MOLECULAR REPAIR HAIR MASK, then used the k18 hair oil and blow dryed. And i have never ever noticed such A DRAMATIC CHANGE IN MY HAIR!!!!! I have been missing out all this time. Especially because it took me 5 years to go completely bleach blonde and I could've been using this product all along. I KNOW ITS PRICEY (FOR ME A SINGLE MOM IT IS VERY EXPENSIVE) BUT IT IS WELL WORTH IT, I NEED A LIFETIME SUPPLY. Thank you K18 for such an amazing bomb product. Definitely a 20 star product. Can't wait to see my hair results after 6 times of using it!!!!!!!!!!!!!

    K18Hair PRO
    1 week ago

    We appreciate your 20-star review! Thank you Fee!

  • Brooke Z.
    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, Frizz, Split-Ends
    Hair Type Medium Density
    My Results Less Breakage
    Rated 5 out of 5 stars
    2 weeks ago
    Love the leave in conditioner!

    Product is great!

    K18Hair PRO
    2 weeks ago

    Thank you for your review!

  • Pamela P.
    Verified Buyer
    Reviewing
    Full-Size Leave-In Molecular Repair Hair Mask 50 mL (WHOLESALE)
    I recommend this product
    Age 35 - 44
    Hair Concern Chemical damage, Heat damage, Fragile/brittle hair, Color-care, Split-Ends
    Hair Type Medium Density
    My Results Less Breakage, Stronger Hair, Visible Difference, Cleaner, fresher hair, Smoother Hair
    Rated 5 out of 5 stars
    3 weeks ago
    Really works

    There’s so many products that say that will help with chemical damaged hair, my hair is blonde and to be blonde it can really damage your hair. I noticed that my hear is getting healthy less breakage softer. Don’t forget to use a heat protector after.

    K18Hair PRO
    2 weeks ago

    Thank you for your review!

  • Mariah H.
    Verified Buyer
    Reviewing
    Mini Leave-In Molecular Repair Hair Mask 15 mL (WHOLESALE)
    I recommend this product
    Age 18 - 24
    Client Hair Concerns Chemical Damage, Dryness, Frizz
    Client Hair Types Medium Density
    Client Results Less Breakage, Defined Curl/Wave Pattern, Soft Touchable Hair, Stronger hair, Bouncy Hair
    Rated 4 out of 5 stars
    3 weeks ago
    Definitely helps!

    My hair was chemically damaged and a large piece broke off. I’ve used this twice since then (so far) and it’s helped me not lose a lot more hair, and I’ve noticed less tangles. My hair has been so much softer and my curls are happier too. I’m definitely going to keep using this product. I only gave 4 stars because I do still have more breakage happening and I had to cut off quite a bit

    K18Hair PRO
    3 weeks ago

    K18 is a progressive treatment. It will get better with each application!

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