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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 out of 5 stars 22,483 ratings

K18
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$29.00 $56.86 per Fl Oz
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Brand K18
Item Form Cream
Material Feature Cruelty Free
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

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
The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked.

K18 Molecular Repair Hair Mask

Merchant Video
mask reverse damage
k18 hair routine
  • 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.

  • 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.

  • 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.

  • 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.

  • 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

Molecular Repair Mask

Molecular Repair Oil

Damage Shield Shampoo

Detox Shampoo

Damage Shield Conditioner

AirWash

Customer Reviews
4.3 out of 5 stars 22,483
4.4 out of 5 stars 1,283
4.5 out of 5 stars 507
4.6 out of 5 stars 1,406
4.5 out of 5 stars 583
4.1 out of 5 stars 210
Price
$75.00 $65.00 $36.00 $38.00 $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 out of 5 stars 22,483 ratings

Customer reviews

4.3 out of 5 stars
22,483 global ratings

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Customers say

Customers find the hair mask effective and appreciate its ability to make hair softer, smooth, and shiny. The product receives mixed feedback regarding hair repair and strength - while some say it helped revive their hair, others report it didn't improve quality, and while some find it stronger than before, others note it becomes brittle over time. Additionally, customers disagree on whether it helps with dryness and frizz, and many find the bottle size too small for the price.

AI-generated from the text of customer reviews

930 customers mention "Effectiveness"774 positive156 negative

Customers find the hair mask works well, with one noting that the results improve with continued use.

"It is pricey but effective. The first time I used it, I was confused because it doesn’t feel effective right away...." Read more

"...It’s worth a try if your hair is damaged from bleach 👌🏼..." Read more

"...But it is an amazing product & by far the best leave in conditioner that has actually controlled frizz, and left my hair soft...." Read more

"...The formula is super easy to apply, and a little goes a long way. I’ve noticed my hair feeling softer, looking shinier, and overall much healthier...." Read more

767 customers mention "Hair softness"705 positive62 negative

Customers report that the hair mask makes their hair softer, smoother, and frizz-free, with one customer noting their hair has never been shinier or softer.

"...Then the K18. At that point my hair is already feeling good. If I add a tiny bit of oil, it is absolutely perfect. Feels like I never abused it. 10/10" Read more

"...left my ends feeling like a straw, but this immediately left my hair looking healthy and hydrated...." Read more

"...The breakage has dramatically reduced, and the texture has improved—my hair feels stronger and more manageable...." Read more

"...My hair was so soft, shiny, not a tangled hot mess and just looked healthier. I bit the bullet after seeing this all over social media...." Read more

267 customers mention "Shine"235 positive32 negative

Customers report that the hair mask makes their strands look shinier and healthier, with one customer noting that their hair has maintained this appearance for six months.

"...The K18 has helped with the damage, added shine back to my hair, and lessened the amount of hair that falls out...." Read more

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

"...My hair was so soft, shiny, not a tangled hot mess and just looked healthier. I bit the bullet after seeing this all over social media...." Read more

"...the difference is very noticeable - my hair looks so much healthier, shinier and more bouncy...." Read more

396 customers mention "Hair repair"251 positive145 negative

Customers have mixed experiences with the hair mask's repair capabilities, with some reporting that it helped revive their hair and saved it, while others found it did not improve their hair quality or was not healthy for their strands.

"...The K18 has helped with the damage, added shine back to my hair, and lessened the amount of hair that falls out...." Read more

"Went from box dark brown neutral dye, to blonde in one sitting. Damage was present. I walked out with bangs! HAHA...." 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

"This stuff is an absolute miracle in a bottle. It has fixed my hair after an unfortunate visit to a salon which left my hair extremely bleach..." Read more

252 customers mention "Strength"163 positive89 negative

Customers have mixed experiences with the hair mask's strength, with some reporting that their hair becomes stronger and breakage stops, while others note that their hair becomes brittle over time.

"...The breakage has dramatically reduced, and the texture has improved—my hair feels stronger and more manageable...." Read more

"...2 more rounds to get my normal hair back because it was very very damaged from the relaxer. Never again y’all. Never again!..." 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

"...It’s a small size but it’ll last you a while because a little goes a long way with this product" Read more

236 customers mention "Drier hair"95 positive141 negative

Customers have mixed experiences with the hair mask's effect on dryness, with some finding it helps with dryness and frizz while others report it makes their hair super dry.

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

"...my next lift session in a couple weeks and this product instantly bought moisture and softness back into my hair...." Read more

"...on my hair I applied following the instructions however my ends continue to be dry after I finished the first bottle The size of the bottle is also..." Read more

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

738 customers mention "Value for money"142 positive596 negative

Customers find the hair mask expensive, with several noting that the bottle size doesn't justify the price.

"It is pricey but effective. The first time I used it, I was confused because it doesn’t feel effective right away...." Read more

"...I bit the bullet after seeing this all over social media. Is it spendy? Yes. But I would gladly pay again an again for this vodoo hair repair...." Read more

"...While it’s on the pricier side, its effectiveness and quality make it worth every penny...." Read more

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

236 customers mention "Bottle size"59 positive177 negative

Customers find the bottle size of the hair mask too small, particularly noting that it doesn't provide enough product for shoulder-length hair.

"Yes, the bottle is TINY. However, I noticed a difference after one use!..." Read more

"...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

"This stuff is an absolute miracle in a bottle...." Read more

"very good product, but the packaging is REALLY small for such an expensive product but next time i buy i’ll get the bigger size...." Read more

Blondes have More Fun Until They Fry Their Hair
5 out of 5 stars
Blondes have More Fun Until They Fry Their Hair
So I bleached the heck out of my hair. I wanted to see if blondes have more fun. Newflash...THEY DO! However there is always a catch. Inthis case bleach fries your hair. My hairdresser suggested this product. What I love is that the healing both starts right away and is also cumulative. SO you can see a little progress the first time you use it and then over time it really heals your hair. So worth staying with it. I use it as my leave in conditioner on a regular basis now. It smells delicious and is super easy to use. Just put it on between shampoo and blow dry. Glad I found it as I can now continue to live my more fun blonde lifestyle!
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Top reviews from the United States

  • Reviewed in the United States on April 1, 2025
    Size: 0.51 Fl Oz (Pack of 1)Verified Purchase
    It is pricey but effective. The first time I used it, I was confused because it doesn’t feel effective right away. But WOW it made a huge difference in my hair, which is super damaged from both years of bleach and also a perm. My hair is less frizzy, softer, and more manageable when I use this. I did shampoo only, no conditioner. Then the K18. At that point my hair is already feeling good. If I add a tiny bit of oil, it is absolutely perfect. Feels like I never abused it. 10/10
    4 people found this helpful
    Report
  • Reviewed in the United States on March 22, 2025
    Size: 0.51 Fl Oz (Pack of 1)Verified Purchase
    Yes, the bottle is TINY. However, I noticed a difference after one use!
    It says to skip conditioner, use the K18, wait 5 minutes, then add your hair products and style as usual. But with as thick as my hair is, I don’t skip conditioner.
    I’ve been blonde for years and went back to my black roots. Used black box dye to cover up the random grays that would come through and got tired of that so started going back lighter. I got balayage and it ruined my hair. Tbh I don’t think the hair stylist knew what she was doing but that’s besides the point. My hair was falling out in huge clumps through out the day and when washing and brushing. The K18 has helped with the damage, added shine back to my hair, and lessened the amount of hair that falls out.
    There’s not much of a scent to the product. It’s light weight. I use more than 4 pumps too. I use about 8-10 pumps. My hair is THICK and half way down my back length wise. I use this once a week and so far it’s been almost a month and I still have plenty left in the bottle. It’s worth a try if your hair is damaged from bleach 👌🏼
    10 people found this helpful
    Report
  • Reviewed in the United States on March 1, 2025
    Size: 0.51 Fl Oz (Pack of 1)Verified Purchase
    I wasn’t expecting it to be this small for the price haha! But it is an amazing product & by far the best leave in conditioner that has actually controlled frizz, and left my hair soft. I’ve bleached my hair several times which has obviously left my ends feeling like a straw, but this immediately left my hair looking healthy and hydrated. It does not leave your hair feeling thick and sticky and it smells great!
    Customer image
    5.0 out of 5 stars
    Small & pricey but so worth it!

    Reviewed in the United States on March 1, 2025
    I wasn’t expecting it to be this small for the price haha! But it is an amazing product & by far the best leave in conditioner that has actually controlled frizz, and left my hair soft. I’ve bleached my hair several times which has obviously left my ends feeling like a straw, but this immediately left my hair looking healthy and hydrated. It does not leave your hair feeling thick and sticky and it smells great!
    Images in this review
    Customer image
    26 people found this helpful
    Report
  • Reviewed in the United States on December 31, 2024
    Size: 0.51 Fl Oz (Pack of 1)Verified Purchase
    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. My hair was dry, brittle, and lacked any real shine or strength. After using this mask for a few weeks, the difference is incredible.

    The formula is super easy to apply, and a little goes a long way. I’ve noticed my hair feeling softer, looking shinier, and overall much healthier. The breakage has dramatically reduced, and the texture has improved—my hair feels stronger and more manageable. It’s as if the mask has repaired the damage I caused over time.

    I now look forward to hair care days because I can actually feel and see the difference. If your hair has been through a lot, this mask is a game-changer! It’s well worth the investment, and my hair has never looked or felt better. Highly recommend!
    32 people found this helpful
    Report
  • Reviewed in the United States on March 3, 2025
    Size: 0.51 Fl Oz (Pack of 1)Verified Purchase
    This stuff is an absolute miracle in a bottle. It has fixed my hair after an unfortunate visit to a salon which left my hair extremely bleach damaged hair. Seriously my hair felt synthetic after and looked fried. I noticed a difference after only using the product one time, which is only 4 squirts from the bottle. My hair was so soft, shiny, not a tangled hot mess and just looked healthier.

    I bit the bullet after seeing this all over social media. Is it spendy? Yes. But I would gladly pay again an again for this vodoo hair repair. Now that my hair is "fixed" I only use K8 once a month and I will never be without.
    15 people found this helpful
    Report
  • Reviewed in the United States on March 11, 2025
    Size: 0.51 Fl Oz (Pack of 1)Verified Purchase
    I have waist long thick curly hair, that tends to get dry and has been dyed from time to time - but it does not have damage from bleach or highlights or using lots of heat. So far I have used this 3 times, and the difference is very noticeable - my hair looks so much healthier, shinier and more bouncy. I am planning to use this 1-2 more times in a row, and then switch to a maintenance mode of using it maybe once a month, as needed.

    Tip on how to use it -you need to put it in your hands, then rub the hands together so it emulsifies and almost looks like you smeared white toothpaste on hands. Then apply it to hair, starting with the ends and moving up. I didn't know that the first time - it makes a big difference, as opposed to simply applying it out of the bottle. I am using 3-4 pumps each time, since my hair is quite long.
    28 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!
    133 people found this helpful
    Report

Top reviews from other countries

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  • Maram Almilhim
    5.0 out of 5 stars Love it
    Reviewed in Saudi Arabia on November 3, 2024
    Size: 0.51 Fl Oz (Pack of 1)Verified Purchase
    👍🏻
  • Stella
    4.0 out of 5 stars Good but tiny
    Reviewed in Sweden on February 15, 2025
    Size: 0.51 Fl Oz (Pack of 1)Verified Purchase
    Customer image
    Stella
    4.0 out of 5 stars
    Good but tiny

    Reviewed in Sweden on February 15, 2025

    Images in this review
    Customer image
  • وداد
    5.0 out of 5 stars يستحق بالفعل
    Reviewed in the United Arab Emirates on February 14, 2025
    Size: 0.51 Fl Oz (Pack of 1)Verified Purchase
    المنتج رائع وسريع المفعول سأعاود شراؤه
    Report
  • Gabi
    5.0 out of 5 stars Buen funcionamiento
    Reviewed in Spain on August 29, 2024
    Textura ligera, un pequeño pump da para media melena. Ideal para mantener pelo seco, estropeado o dañado. Leer bien el funcionamiento y el proceso. El olor podría mejorar, huele a químico. Percepción personal.
  • KP
    5.0 out of 5 stars Great product
    Reviewed in Canada on February 23, 2025
    My hair was very damaged and whole this product is fairly pricey I felt that it really helped repair my damaged hair