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K18 Leave-In Molecular Hair Mask, Repairs Dry or Damaged Hair, Reverse Hair Damage from Bleach, Color, Chemical Services & Heat

4.3 4.3 out of 5 stars 21,885 ratings

K18
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Purchase options and add-ons

Brand K18
Item Form Cream
Hair Type dry, All
Product Benefits Our K18PEPTIDE™ repairs hair at a molecular level across multiple types of bonds, restoring hair health for all See more
Age Range (Description) Adult

Additional Details

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Description

This leave-in treatment mask works on the molecular level to reverse hair damage in just 4 minutes. It tackles daily damage with immediate and lasting results to restore strength, softness, smoothness and bounce to hair

Benefits

Our K18PEPTIDE™ repairs hair at a molecular level across multiple types of bonds, restoring hair health for all

Suggested use

Shampoo, do not condition. Towel-dry thoroughly. Apply 1-3 pumps of K18 mask & massage through hair. Let treatment sit in the hair for 4 minutes. Do not rinse

Complete the regimen
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Product Description

mask image
mask reverse damage
mask
mask
hair strength
  • How does the K18 mask work?

    The K18 Mask works as a treatment to reverse damage in 4 minutes. It’s powered by our biomimetic K18PEPTIDE to seamlessly fit in and reconnect broken polypeptide chains at the molecular level.

  • What is the K18PEPTIDE?

    K18PEPTIDE is a biotech-developed peptide that mimics hair’s structure to reverse damage by reconnecting polypeptide chains and disulfide bonds broken during damage from bleach + color, chemical services, and heat.

  • 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.

  • I noticed there’s alcohol in the formula, isn’t that bad for you?

    We like to keep our formulas minimal, only using the exact amount of ingredients needed to get the peptide where it needs to go. Here the alcohol serves as an agent to optimize the hair environment for the K18 Mask to work on a deeper level.

  • When should I expect to see results?

    Most see results after 2-3 uses. The more damaged the hair, the more dramatic the results so it may vary depending on your hair type and level of damage.

Shop the K18 Collection

hair mask

Molecular Repair Mask

hair oil

Molecular Repair Oil

damage shield

Damage Shield Shampoo

detox shampoo

Detox Shampoo

damage shield conditioner

Damage Shield Conditioner

airwash

AirWash

Customer Reviews
4.3 out of 5 stars 21,885
4.4 out of 5 stars 1,190
4.5 out of 5 stars 397
4.6 out of 5 stars 1,317
4.5 out of 5 stars 527
4.2 out of 5 stars 127
Price
$75.00 $65.00 $36.00 $36.00 $48.00
Molecular Repair
Maintenance Routine
Treatment Routine
Used By Professionals
At Home Use

Product details

  • Product Dimensions ‏ : ‎ 3.15 x 1.57 x 1.57 inches; 1 ounces
  • Item model number ‏ : ‎ K18-31007
  • UPC ‏ : ‎ 858511001289 746559900490 858511001371
  • Manufacturer ‏ : ‎ K18
  • ASIN ‏ : ‎ B09HR5KSR8
  • Country of Origin ‏ : ‎ USA
  • Customer Reviews:
    4.3 4.3 out of 5 stars 21,885 ratings

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Customer reviews

4.3 out of 5 stars
21,885 global ratings

Review this product

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Customers say

Customers find that the conditioner works well and provides great results for softening, smoothing, and enhancing hair shine. They say it improves hair texture and appearance. However, some find the pricey and bottle size disappointing. Opinions vary on its effectiveness in repairing hair damage, strengthening it, and preventing dryness.

AI-generated from the text of customer reviews

870 customers mention "Effectiveness"718 positive152 negative

Customers like the conditioner's effectiveness. They say it works well, feels smooth in hair, and is worth the price. The fragrance is mild, and the treatment keeps working over time.

"...last without washing away, so it’s truly a treatment that keeps working over time!" Read more

"...It's on the pricier side but it delivered significant results from the very first use." Read more

"...It’s an ok product but it’s my first time using it. Will continue using it!" Read more

"...I’m soooo glad I hit buy it now! This is the best conditioner, hair mask, and leave in conditioner I’ve ever used...." Read more

746 customers mention "Hair softness"687 positive59 negative

Customers like the conditioner for its softness and smoothing effects. They find it moisturizing and effective in reducing frizz and fly-aways. The product improves hair texture and adds shine.

"...too overpowering, and it was just right to make my hair smell and feel good." Read more

"...hair from bleach, color treatments, and heat—my hair feels stronger, softer, and looks so much healthier...." Read more

"This product has transformed my hair. It's on the pricier side but it delivered significant results from the very first use." Read more

"...But NO. This? This is HAIR CPR. I slathered it on and within minutes, my ends went from desert straw to moisturized silk...." Read more

258 customers mention "Shine"226 positive32 negative

Customers like the conditioner's shine. They say it makes their hair shinier, less frizzy, and easier to style. The product has a pleasant tropical fruit scent.

"...In this 3 weeks, I suddenly have shine, volume, and no longer feel a need to blow out my hair, or curl, or iron it...." Read more

"...I’ve noticed my hair feeling softer, looking shinier, and overall much healthier...." Read more

"this was recommended to me by my stylist, it has made my hair look and feel much better." Read more

"...My hair feels soooo good soft and shiny. I put leave in after and my hair looks so healty. I will be buying again" Read more

390 customers mention "Hair repair"251 positive139 negative

Customers have mixed opinions about the hair repair. Some say it helps restore their hair's health and vitality, and is the best treatment they can get at home. However, others say it did not improve their hair quality in a dramatic way.

"This hair product worked wonders on my hair, I splurged on this product because I heard wonderful great reviews about it...." Read more

"...Wrong, wrong, worst hair day I've had in a long time...." Read more

"...It works wonders on damaged hair from bleach, color treatments, and heat—my hair feels stronger, softer, and looks so much healthier...." Read more

"I cannot rave enough about the K18 Hair Mask—it has truly saved my hair! I used to pull my hair every day, causing so much damage and breakage...." Read more

247 customers mention "Strength"159 positive88 negative

Customers have mixed views on the conditioner's strength. Some say it makes their hair stronger and healthier, repairing and strengthening from within. Others mention that their hair feels dry and brittle after using it, and the consistency is not as advertised.

"...on damaged hair from bleach, color treatments, and heat—my hair feels stronger, softer, and looks so much healthier...." Read more

"...They are super dry and brittle. I used K18 after ONE wash with Redkin bonding shampoo, and my hair feels brand new!..." Read more

"...The smell is pleasant and not overbearing. My hair feels stronger, and I’m not finding the tangles I once was...." Read more

"...It shortens my shower time, extends the life of my conditioner, makes brushing my hair effortless, and leaves my hair looking healthy once..." Read more

232 customers mention "Dryness"93 positive139 negative

Customers have mixed reviews about the conditioner's ability to reduce dryness and frizz. Some find it helps with a soft, less brittle texture and allows air-drying without frizz. Others report their hair still feels dry and straw-like after using it for a week.

"...Second time trying it, it just left my hair dry...." Read more

"...it on and within minutes, my ends went from desert straw to moisturized silk...." Read more

"...It was just dry and frizzy...." Read more

"...Also, the scent is almost non-existent and by the time it has soaked into my hair I don't smell it at all - and I have an extremely sensitive nose...." Read more

711 customers mention "Value for money"135 positive576 negative

Customers find the conditioner expensive and small for the price. They say it's not practical for everyday use and lacks structure.

"...The price of this product is not ideal and I definitely think there are other products out there that one could use if they’re on a budget...." Read more

"This product has transformed my hair. It's on the pricier side but it delivered significant results from the very first use." Read more

"...I had to use like 7 pumps and this product is expensive...." Read more

"...It’s well worth the investment, and my hair has never looked or felt better. Highly recommend!" Read more

227 customers mention "Bottle size"57 positive170 negative

Customers are unhappy with the bottle size. They find it too small for long hair and too expensive for regular use. Some say the packaging is small and not worth the money.

"...The brand's bundles are a nice idea but again, the high cost and dismal size of the product received do not match up...." Read more

"...It's extremely small if you get the small one, like small small, but my Mon seems happy so I'd say it's worth it for the price." Read more

"...It shortens my shower time, extends the life of my conditioner, makes brushing my hair effortless, and leaves my hair looking healthy once..." Read more

"...and leave it in, the reason why I don't give it a 5 is because it is very small and the price is not that cheap, but in general it is a quality..." Read more

Bountiful Body but tangled
4 out of 5 stars
Bountiful Body but tangled
-For my long hair ... 35 pumps.- Badly damaged dry ends look much much better. FEELS QUITE SOFT- my thick hair even more body- left my hair tangled, hard to brush-comb-hair frizzy despite trying to use flat iron♡ hope using it several times will improve the frizz.Definitely huge improvement. But needs a 2nd product for frizz, tangles, shineLeft pic after k18. Right pic before, with coconut oil after miracle 10 leave in for blondes
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Top reviews from the United States

  • Reviewed in the United States on January 25, 2025
    Size: 0.51 Fl Oz (Pack of 1)Verified Purchase
    This hair product worked wonders on my hair, I splurged on this product because I heard wonderful great reviews about it. The price of this product is not ideal and I definitely think there are other products out there that one could use if they’re on a budget.
    The scent wasn’t too overpowering, and it was just right to make my hair smell and feel good.
    15 people found this helpful
    Report
  • Reviewed in the United States on January 2, 2025
    I’ve been using the K18 Leave-In Treatment, and it’s a total game-changer for my hair! It works wonders on damaged hair from bleach, color treatments, and heat—my hair feels stronger, softer, and looks so much healthier. What I love is that it doesn’t just cover up damage, but actually restores it from the inside out, giving me that "like-new" texture. Plus, the results last without washing away, so it’s truly a treatment that keeps working over time!
    Customer image
    5.0 out of 5 stars
    Miracle in a Bottle

    Reviewed in the United States on January 2, 2025
    I’ve been using the K18 Leave-In Treatment, and it’s a total game-changer for my hair! It works wonders on damaged hair from bleach, color treatments, and heat—my hair feels stronger, softer, and looks so much healthier. What I love is that it doesn’t just cover up damage, but actually restores it from the inside out, giving me that "like-new" texture. Plus, the results last without washing away, so it’s truly a treatment that keeps working over time!
    Images in this review
    Customer image
    36 people found this helpful
    Report
  • Reviewed in the United States on January 22, 2025
    This product has transformed my hair. It's on the pricier side but it delivered significant results from the very first use.
    7 people found this helpful
    Report
  • Reviewed in the United States on February 13, 2025
    Size: 0.51 Fl Oz (Pack of 1)Verified Purchase
    I was really skeptical at first because it felt so odd to shampoo and not condition after.. but I followed its directions: I shampooed, towel dried my hair, and put this product in and left in for the 4 minutes.

    My hair did feel softer, less rough, yes, but I have a lot of coarse curly hair (transitioning from heat damage)

    I had to use like 7 pumps and this product is expensive. It made like 80% of my hair feel soft and the rest of it i had to use another leave in conditioner to take out the tangles my hair has. It’s an ok product but it’s my first time using it. Will continue using it!
    5 people found this helpful
    Report
  • Reviewed in the United States on October 14, 2024
    Size: 0.51 Fl Oz (Pack of 1)Verified Purchase
    I’ve tried many a leave in conditioner and they always left my hair feeling heavy and sticky. They just weren’t right for my hair type, which is thinning, damaged, and dry. I also live in the very humid state of Florida. I watched a YouTuber who happened to have gorgeous hair, but had nothing to do with the beauty industry. She had gotten a lot of questions on her hair and recommended this. I’m soooo glad I hit buy it now! This is the best conditioner, hair mask, and leave in conditioner I’ve ever used. I’ve been using for about 3 weeks and I only wash about 1-2 times per week. In this 3 weeks, I suddenly have shine, volume, and no longer feel a need to blow out my hair, or curl, or iron it. I simply blow dry my roots about 10 minutes after applying from mid length to ends. Let the rest air dry and holy cow, the difference!! I’ll wrap it up in a soft scrunchie once dry for sleeping and when I wake up, it looks like I had it professionally done! The shedding had been much less since I started using. I don’t know if that’s from this or just a natural cycle and to be fair, I also dyed my hair from copper back to my natural dark brown. But this is now a forever staple in my hair routine. The smell is pleasant and not overbearing. My hair feels stronger, and I’m not finding the tangles I once was. My hair used to be so dry that I couldn’t get a brush through it.
    38 people found this helpful
    Report
  • Reviewed in the United States on February 5, 2025
    Look, I’ve done unspeakable things to my hair. Bleach? Yep. Box dye at 2 a.m.? Of course. That one time I tried to "go blonde" at home and ended up with the color of an abandoned cornfield in winter? You bet. My hair has been through it, and honestly, I expected this mask to just sit there like my ex—promising things and delivering disappointment.

    But NO. This? This is HAIR CPR. I slathered it on and within minutes, my ends went from desert straw to moisturized silk. I don’t know what kind of molecular wizardry is in this bottle, but I’m convinced K18 is a front for some underground hair-reviving sorcery.

    It’s like if your split ends went to therapy, healed their trauma, and came back with a trust fund. Expensive? Yes. Worth it? Also yes. 10/10, will be rationing this like it’s the last bottle on earth.
    40 people found this helpful
    Report
  • Reviewed in the United States on October 7, 2024
    I fell in love with the K18 Leave-In Molecular Hair Mask about a year ago after my hairdresser introduced me to it. While it’s on the pricier side, its effectiveness and quality make it worth every penny. When I’m unable to splurge, I turn to my regular leave-in spray, Perfect 10 Lite.

    As someone with thin, color-treated hair that tangles easily and suffers from damage, this product has been a game changer. It shortens my shower time, extends the life of my conditioner, makes brushing my hair effortless, and leaves my hair looking healthy once styled.

    I recently purchased the larger size, fully aware of the cost. However, when I opened my package, I briefly thought I either ordered the smaller size by mistake or received the wrong item. I realized it was indeed the larger size I ordered and I debated returning it.

    The true test came when I woke up with a legit rat's nest. I was so thankful I had this product on hand, as it made detangling much easier than previous times when I had nothing to help with the mess.

    One note: I read a review suggesting that you should rub the product between your palms to activate it before applying it to your hair. That makes sense, and I’ll definitely give it a try. However, I find it quite unethical that the company leaves this step out of the instructions on the box and bottle. It feels like they might not want you to use it correctly so that you’ll need to buy more sooner—quite disappointing!
    97 people found this helpful
    Report

Top reviews from other countries

Translate all reviews to English
  • Sam
    5.0 out of 5 stars THE BEST HAIR PRODUCT. (Hair routine included below)
    Reviewed in Canada on February 6, 2025
    Size: 0.51 Fl Oz (Pack of 1)Verified Purchase
    BEST PRODUCT EVER. I can’t remember how I found K18 but honestly I will never go back to anything else. I have very long hair & was looking for something to help with the texture/smoothness after I got highlights. I had another mask before this that was good but this was like a little miracle worker.

    I don’t use it every wash because it is a bit pricey and I have a LOT of hair to cover lol. But right after getting highlights I’ll use it once a week for about a month to repair my hair. Then I’ll only use it if I’m going out for a nicer occasion or I feel my hair needs a bit of help.

    I focus it mainly on the ends.

    I’ve gotten so many compliments on how beautiful my hair is/how soft it is since using this!

    I love that it’s so easy, no rinsing it out or anything.

    I do wish it came in even a larger size (I know they have this travel size and the slightly bigger one) but I would love an even bigger bottle!

    Also side note, I didn’t have my hair cut in 3 years and used this during the later months of that time period, and when I finally went to have it cut, my hair dresser was shocked by how healthy my hair was for it being 3 years. She went around telling everyone she couldn’t believe it. 😆

    Anyways, long story short, buy this product! You won’t regret it!!

    My Exact Routine for Soft Shiny Hair:
    1. Wash hair well with shampoo (I use the Aussie brand) (I often wash twice with shampoo because I wash my hair fewer times a week, scrub really well). Don’t use conditioner.
    2. Gently towel dry hair after. Brush hair before or after K18 (it’s easier after if you’re lazy sometimes like me, lol) Use K18 as directed.
    3. After k18 has had time to sit on your hair, you can put on a leave in conditioner. I use the Marc Anthony Coconut & Shea.
    4. Blow dry hair. (My hair is naturally quite straight when blow dried so feel free to straighten or curl yours after this step if needed).
    5. Take a small amount of Renewing+ Argon Oil of Morocco and run it through the ends of your hair mainly. Then use any small excess amount to run through your hair over any strays. Brush through your hair after to evenly disperse it.
    5. Finish with a spray of AG Hair Care Argon Shine & Flat Oil Spray. This stuff makes your hair shine! Even if you’re going for a curly look, a little spritz of this just adds a nice sheen to your hair, making it look healthier and more alive. (A friend of mine actually borrowed this once because her hair was a bit frizzy and later asked me what it was because she loved it so much).
    Comb it through your hair and you’re done!

    Hope this helps someone! ☺️
    Customer image
    Sam
    5.0 out of 5 stars
    THE BEST HAIR PRODUCT. (Hair routine included below)

    Reviewed in Canada on February 6, 2025
    BEST PRODUCT EVER. I can’t remember how I found K18 but honestly I will never go back to anything else. I have very long hair & was looking for something to help with the texture/smoothness after I got highlights. I had another mask before this that was good but this was like a little miracle worker.

    I don’t use it every wash because it is a bit pricey and I have a LOT of hair to cover lol. But right after getting highlights I’ll use it once a week for about a month to repair my hair. Then I’ll only use it if I’m going out for a nicer occasion or I feel my hair needs a bit of help.

    I focus it mainly on the ends.

    I’ve gotten so many compliments on how beautiful my hair is/how soft it is since using this!

    I love that it’s so easy, no rinsing it out or anything.

    I do wish it came in even a larger size (I know they have this travel size and the slightly bigger one) but I would love an even bigger bottle!

    Also side note, I didn’t have my hair cut in 3 years and used this during the later months of that time period, and when I finally went to have it cut, my hair dresser was shocked by how healthy my hair was for it being 3 years. She went around telling everyone she couldn’t believe it. 😆

    Anyways, long story short, buy this product! You won’t regret it!!

    My Exact Routine for Soft Shiny Hair:
    1. Wash hair well with shampoo (I use the Aussie brand) (I often wash twice with shampoo because I wash my hair fewer times a week, scrub really well). Don’t use conditioner.
    2. Gently towel dry hair after. Brush hair before or after K18 (it’s easier after if you’re lazy sometimes like me, lol) Use K18 as directed.
    3. After k18 has had time to sit on your hair, you can put on a leave in conditioner. I use the Marc Anthony Coconut & Shea.
    4. Blow dry hair. (My hair is naturally quite straight when blow dried so feel free to straighten or curl yours after this step if needed).
    5. Take a small amount of Renewing+ Argon Oil of Morocco and run it through the ends of your hair mainly. Then use any small excess amount to run through your hair over any strays. Brush through your hair after to evenly disperse it.
    5. Finish with a spray of AG Hair Care Argon Shine & Flat Oil Spray. This stuff makes your hair shine! Even if you’re going for a curly look, a little spritz of this just adds a nice sheen to your hair, making it look healthier and more alive. (A friend of mine actually borrowed this once because her hair was a bit frizzy and later asked me what it was because she loved it so much).
    Comb it through your hair and you’re done!

    Hope this helps someone! ☺️
    Images in this review
    Customer imageCustomer image
  • almaa
    5.0 out of 5 stars Buen producto
    Reviewed in Mexico on October 18, 2024
    Buen producto, hidrata el cabello. En mi caso, mi pelo no estaba tratado ni muy dañado, por lo que no puedo decir qué tanto funciona en esos casos.
  • Ana Rodrigues
    5.0 out of 5 stars Produto excelente
    Reviewed in Brazil on September 12, 2024
    Recupera bem o cabelo. Produto incrível. A entrega atrasou por culpa dos correios já que o vendedor postou o produto rápido. Produto veio bem embalado, lacrado e com manual de instruções. O tamanho é bom, vai render bastante. Essa é a segunda vez que compro o k18 e a primeira desse vendedor e gostei mais desse porque veio lacrado e com manual de instruções.
  • Audrey Lonni
    5.0 out of 5 stars Excelente!
    Reviewed in Brazil on February 3, 2024
    Size: 0.51 Fl Oz (Pack of 1)Verified Purchase
    Produto muito eficiente, que vale o alto custo. Atua revertendo o dano no fio capilar.
  • Natalia
    5.0 out of 5 stars Miracle Product!
    Reviewed in Canada on January 11, 2024
    This is a miracle product. If it’s your first time using it, you’ll want to use it for 4 showers in a row like the instructions say. This makes all the difference. I’ve been bleaching my hair for 2 years now and after completing my 4th treatment my hair was silky and smooth just like virgin hair! I used to have a lot of flyaways on the top of my head as well and those were greatly reduced. 11/10 product!