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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
1,967 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
4.9
Rated 4.9 out of 5 stars
436 Reviews
Weightless oil that strengthens, repairs damage + reduces frizz Log In / REGISTER
PEPTIDE PREP™ detox shampoo
4.9
Rated 4.9 out of 5 stars
267 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 1,967 reviews
1,967 reviews
  • Delilah P.
    Verified Reviewer
    Reviewing
    Professional Molecular Repair Mask 150 mL (WHOLESALE)
    I recommend this product
    Age 45 - 54
    Client Hair Concerns Chemical Damage, Split Ends, Dryness, Heat Damage, Frizz
    Client Hair Types Fine/Thin, Grey Hair, Curly/Coily, Thick/Coarse, Straight/Wavy
    Client Results Less Frizz, Bouncy Hair, Visible Difference, Stronger hair, Less Breakage
    Rated 5 out of 5 stars
    5 days ago
    The best restorative medicine for hair! The leave in mask

    I’m in love with the line K18 , as a professional hair stylist I’ve tried many different types of treatments and this one for me is a winner! I’m all about theory /certification to really understand the main core principles/use of a product.

    Hair feels silky, clean and healthy! Highly recommend K18 to keep that crown shiny.

    K18Hair PRO
    5 days ago

    Delilah, we're absolutely thrilled to hear from a professional hair stylist who truly understands the science behind K18! It means the world to us that after trying so many different treatments, K18 stands out as a winner for you.

  • Denise B.
    Verified Buyer
    Reviewing
    Full-Size Leave-In Molecular Repair Hair Mask 50 mL (WHOLESALE)
    I recommend this product
    Age 55 - 64
    Hair Concern Chemical damage, Frizz, Dryness, Extending time between washes
    Hair Type Grey Hair, Straight/Wavy, Medium Density
    My Results Less Frizz, Visible Difference, Stronger Hair, Smoother Hair, Shinier Hair
    Rated 5 out of 5 stars
    3 weeks ago
    Magic in a bottle

    This product has transformed my hair!

    Why did it take me 60 years to discover it??

    K18Hair PRO
    3 weeks ago

    Thank you so much for this amazing review, Denise! Your hair is beautiful! We love that you're experiencing the magic and appreciate you taking the time to share your wonderful experience!

  • Niav H.
    Verified Buyer
    Reviewing
    Full-Size Leave-In Molecular Repair Hair Mask 50 mL (WHOLESALE)
    I recommend this product
    Age 35 - 44
    Hair Concern Extending time between washes, Fragile/brittle hair, Color-care
    Hair Type Fine/Thin, Straight/Wavy
    My Results Soft Touchable Hair, Cleaner, fresher hair, Bouncy Hair, Visible Difference, Oil absorbed
    Rated 5 out of 5 stars
    2 months ago
    Love this product

    I have been loving using this product. It works as advertised. 4 pumps after shampooing only. My hair is in better shape after several weeks of using

    K18Hair PRO
    1 month ago

    We’re so happy K18 is bringing your hair back to life, thank you for trusting us with your strands!

  • Mallory
    Verified Reviewer
    Reviewing
    Full-Size Leave-In Molecular Repair Hair Mask 50 mL (WHOLESALE)
    I recommend this product
    Age 18 - 24
    Hair Concern Chemical damage, Frizz, Dryness, Fragile/brittle hair, Split-Ends
    Hair Type Medium Density, Straight/Wavy, Curly/Coily
    My Results Visible Difference, Bouncy Hair, Defined Curl/Wave Pattern, Stronger Hair, Soft Touchable Hair
    Rated 5 out of 5 stars
    2 months ago
    Has changed my curls for the better

    All my life I didn’t know how to look after my curly properly and growing up, I always thought i was just fluffy and wide. I never knew my hair was frizzy or knew how to look after it. I work in a chlorinate environment for the last year and a half and the chlorine was damaging my hair and curls. For about 8-9 months I’ve been wearing a big swimming cap to prevent any more chlorine from getting into my hair and it has helped but the damage was still there.

    No until about 3 months ago I discovered the K-18 bond repair treatment and technics and products to help with curly hair. I was a little bit hesitant to buy the K-18 mask but I needed something to help repair my hair.

    I’m very glad I have. Over the last 2 months I’ve been styling my hair like curly hair and added the K-18 repair mask into my routines and my hair has never looked or felt better. The photos are the before and after and my after photos show my definition within my curls and my hair is much stronger. This bond repair treatment has not only saved my hair from the damage from the chlorinated water but has brought my curls back to life. I never knew my hair could be this curly. This mask has been a true curl/hair saver and I will continue to use it in my routine. <3

    The photo when I’m in the blue shirt was me just over 2 months ago and the photos of me in the black shirt is me recently. I’m also showing how defined my curls have been in one of the photos, ignore the mess in the background as my bathroom is…

    K18Hair PRO
    2 months ago

    Wow! These are some amazing results! Thank you for trusting us with your beautiful hair!

  • Jamilla
    Verified Buyer
    Reviewing
    Full-Size Leave-In Molecular Repair Hair Mask 50 mL (WHOLESALE)
    I recommend this product
    Age 35 - 44
    Hair Concern Fragile/brittle hair, Dryness
    Hair Type Medium Density
    My Results Less Breakage, Soft Touchable Hair, Visible Difference
    Rated 5 out of 5 stars
    2 months ago
    My forever product

    I first purchased the trial package back in 2023, I loved it so I purchased the 50ml in September 2024. I just ran out of that bottle so I subscribed for a delivery every 6 months. This mask has strengthened my hair along with the other mask and conditioner I use after each wash. 2024 I also had a baby which caused my hair to thin, k18 established the bonds of my hair so that I would lose my length, my hair is still coming together after giving birth and I know this mask has done wonders for my hair. I had bad hair loss after all three of my pregnancy and this is the only product I repurchase because of the effects. Blue heart picture is 2024 and pink shirt is now 2025.

    K18Hair PRO
    2 months ago

    Thank you for your review and continued support, Jamilla!

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