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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 19,432 ratings

K18
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Purchase options and add-ons

Brand K18
Item Form Cream
Material Feature Natural
Hair Type Damaged
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

hair repair mask treatment for damaged hair

**Clinical studies supporting our claims were done at the University of Minho in Portugal Jan 2021

hair repair mask treatment for damaged hair

*World Patent No WO2015056216A2

hair repair in 4 minutes
hair repair mask treatment for damaged hair
hair treatment mask to repair damaged hair
hair treatment to repair damaged hair from heat and chemicals
K18 hair repair mask treatment for damaged hair K18 50ml hair repair mask treatment for damaged hair hair oil k18 k18
15ml Hair Repair Mask for Damaged Hair 50ml Hair Repair Mask for Damaged Hair Molecular Hair Repair Oil PEPTIDE PREP pH Maintenance Shampoo PEPTIDE PREP Detox Shampoo
Customer Reviews
4.3 out of 5 stars
19,432
4.3 out of 5 stars
19,432
4.4 out of 5 stars
907
4.5 out of 5 stars
929
4.6 out of 5 stars
1,016
Price $29.00 $75.00 $65.00 $38.00
Size 15ml 50ml 30ml 8.5oz 8.5oz
Hair Mask
Hair Oil
Shampoo
Molecular Repair
Heavy Duty Cleanse
Everyday Cleanse
Used by Professionals
At Home Use

Product details

  • Product Dimensions ‏ : ‎ 3.54 x 1.57 x 3.54 inches; 3.2 ounces
  • Item model number ‏ : ‎ K18-31005
  • UPC ‏ : ‎ 858511001128 858511001029 729162271362 729162270877 755801147958 726929222179 729162271317 729162271249 729162271096
  • Manufacturer ‏ : ‎ K18
  • ASIN ‏ : ‎ B0961ZS96M
  • Customer Reviews:
    4.3 4.3 out of 5 stars 19,432 ratings

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Customer reviews

4.3 out of 5 stars
19,432 global ratings

Customers say

Customers like the softness and shine of the conditioner. They say it makes their hair feel unbelievably soft and smooth. They also appreciate the quality. However, some customers feel the product is small and not worth the money. Opinions are mixed on dryness, effect on hair, and frizz.

AI-generated from the text of customer reviews

1,046 customers mention "Quality"790 positive256 negative

Customers like the quality of the conditioner. They say it works wonders, it helps a ton, and it efficiently does the job of conditioner. Some customers also mention that it strengthens their hair and makes an immediate difference from the first application.

"...The results are noticeable after just one use: my hair feels significantly softer, more manageable, and visibly shinier...." Read more

"...It makes my hair feel so soft and it strengthens my hair. If your hair is damaged from bleaching, I would highly suggest using this!..." Read more

"...Today after using k18 for a few months, my hair is strong, defined, shiny, and beautiful! I'll let the photos speak for themselves." Read more

"The first time I use this my hair felt so gross and dry and brittle that I was going to return it...." Read more

436 customers mention "Softness"408 positive28 negative

Customers are satisfied with the softness of the conditioner. They mention that it makes their hair feel soft, smooth, and silky to the touch. Some say that their hair looks healthy and shiny after first application. Overall, most are happy with the product's ability to improve the texture and overall health of their hair.

"...The results are noticeable after just one use: my hair feels significantly softer, more manageable, and visibly shinier...." Read more

"...It makes my hair feel so soft and it strengthens my hair. If your hair is damaged from bleaching, I would highly suggest using this!..." Read more

"...Then style as usual.Makes my hair incredibly soft and manageable but without weighing it down or feeling greasy!" Read more

"...The only negative I would say is that while all the front bits are nice and soft, I do see that my hair is “producty” at the root...." Read more

277 customers mention "Effect on hair"193 positive84 negative

Customers are mixed about the effect of the conditioner. Some mention it works wonders to reverse hair damage and restore your locks. They say it instantly repairs damaged hair within 4 minutes of use. However, others say that it's expensive and didn't see a difference in their hair. They also say that the product didn't do anything for their hair and that they can'' not traditionally condition the hair with it.

"...that penetrates deep into the hair’s cortex, effectively restoring strength and elasticity from within...." Read more

"...It's remarkable how effectively it has reversed the damage, making my hair look and feel revitalized...." Read more

"...What is it supposed to do? It's expensive and I have not seen a difference in my hair. I think it's overrated." Read more

"...I can afford on a regular basis but, that being said, it worked on my over processed hair after using as described...." Read more

181 customers mention "Style"147 positive34 negative

Customers like the style of the conditioner. They say it makes their hair look shiny, and healthy. Some customers also mention that it makes hair feel thinner. Overall, most are satisfied with the style and quality of the product.

"...It makes my hair shiny and soft. My biggest complaint is that you get such a small amount for the price. It is very expensive." Read more

"...Great shine & manageability with no frizz. I didn’t put any other product in it...." Read more

"...before doing anything to your hair, it smells great, it provides shine to my hair, my hair is happier and softerI do recommend this product" Read more

"This mask has made my hair more smooth, shiny, and manageable. My hair reacts better to this than conditioner, so I use it regularly...." Read more

180 customers mention "Dryness"59 positive121 negative

Customers are mixed about the dryness of the conditioner. Some mention that it helps combat dryness, keeps moisture in, and is perfect for anyone battling dry, unruly hair. However, others say that it made their hair really dry, limpy, lifeless, and too dry after watching.

"The first time I use this my hair felt so gross and dry and brittle that I was going to return it...." Read more

"...into it so it came out of the bleach still pretty healthy but it felt super dry, and I still had to bleach it again...." Read more

"...without tearing through entire tangled chunks, it also speeded up drying time like crazy and didn’t weight down my super fluffy wavy fine hair one..." Read more

"...Instead it was chunky and partially dried out...." Read more

162 customers mention "Frizz"85 positive77 negative

Customers are mixed about the frizz. Some mention that the product eliminates frizz, while others say that it still remains.

"...I let my hair dry naturally and the end result is shine and less frizz." Read more

"...I dyed my hair once and the curls weren't the same. Frizzy, undefined, no structure, dull, and just so fugly...." Read more

"...However my hair is so less frizzy and dry this way" Read more

"...But after one wash not using k18 the frizz came back a good bit, 2nd wash it was back the the previous fluff from before I ever used it...." Read more

541 customers mention "Value"44 positive497 negative

Customers are dissatisfied with the value of the conditioner. They mention that it's beyond expensive, not practical for everyday use, and doesn't work as advertised. Some say that the directions didn't help and made their fine, bleach damaged hair even more dry.

"...My biggest complaint is that you get such a small amount for the price. It is very expensive." Read more

"...Only reason I gave it four stars was because how freaking expensive it is for such a small amount...." Read more

"The cost of this product is expensive, and it is more than I usually spend on hair care products...." Read more

"this is the biggest waste of money I've ever seen, ...." Read more

162 customers mention "Size"30 positive132 negative

Customers are disappointed with the size of the conditioner. They mention that it's amazingly small, extremely tiny, and only half full.

"...It is a very small bottle." Read more

"...I think the bottle is too small and it is not a magic solution as advertised" Read more

"...I have tried better products. The bottle was tiny, and it was no good value for money." Read more

"...I can't recommend this enough!! The bottle is very small for the price but it's worth it!!" Read more

I’m in shock.
5 out of 5 stars
I’m in shock.
I’m Indian. I had thick straight hair that has turned thin and curly over the years due to damage, bleach, straighteners, and products. I used this for the first time today and it is insane to me that something actually worked for my hair. I followed the exact directions and it seems as if years of damage just vanished off my hair after the first use. I can assure you my hair is usually puffy and visibly brittle, but not today. I was very concerned when I saw the size of the product (I bought the small one and boy is it tiny for the price), but I can assure you it is 100% worth the price for the quality of it. Just wowed. I didn’t think anything could repair my hair at this point, but I took a chance and if you’re taking a chance too, this is the product to take that chance with. Recommend fully.
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Top reviews from the United States

Reviewed in the United States on August 15, 2024
Size: 0.51 Fl Oz (Pack of 1)Verified Purchase
I ABSOLUTELY love this!
As a long-time user of various hair care products, I was excited to try the K18 Leave-In Molecular Repair Hair Mask, and it certainly lives up to the hype.

This leave-in treatment stands out for its innovative approach to repairing damaged hair. The K18 mask uses a patented peptide technology that penetrates deep into the hair’s cortex, effectively restoring strength and elasticity from within. The results are noticeable after just one use: my hair feels significantly softer, more manageable, and visibly shinier.

The mask is easy to apply—just a small amount is needed for even coverage. It doesn’t leave any residue or weigh down the hair, which is a huge plus. I also appreciate that it doesn’t require heat or rinsing, making it a convenient addition to my routine.

Overall, the K18 Leave-In Molecular Repair Hair Mask is a game-changer for anyone looking to restore their hair’s health and vitality. It’s a bit of an investment, but the results are worth every penny. My hair has never felt better!
2 people found this helpful
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Reviewed in the United States on June 27, 2024
Size: 0.51 Fl Oz (Pack of 1)Verified Purchase
I love this product! After I wash my hair I use one pump of this product and run it through my hair. It makes my hair feel so soft and it strengthens my hair. If your hair is damaged from bleaching, I would highly suggest using this! It makes my hair shiny and soft. My biggest complaint is that you get such a small amount for the price. It is very expensive.
22 people found this helpful
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Reviewed in the United States on August 15, 2024
Products like Olaplex and k18 are often misused--they are specifically for BLEACHED, PERMED, or otherwise CHEMICALLY TREATED hair. If your hair is not chemically treated, you are wasting your money on such products. However, if your hair is chemically treated and hasn't been the same since, this is the product for you. You must use it correctly, meaning you cannot condition after you shampoo-however, this does not mean you can't use a pre-poo conditioner to detangle your hair. Condition, detangle, shampoo twice, gently towel dry, and then apply this product. I dyed my hair once and the curls weren't the same. Frizzy, undefined, no structure, dull, and just so fugly. Today after using k18 for a few months, my hair is strong, defined, shiny, and beautiful! I'll let the photos speak for themselves.
Customer image
5.0 out of 5 stars It works--IF you use it for its intended purpose
Reviewed in the United States on August 15, 2024
Products like Olaplex and k18 are often misused--they are specifically for BLEACHED, PERMED, or otherwise CHEMICALLY TREATED hair. If your hair is not chemically treated, you are wasting your money on such products. However, if your hair is chemically treated and hasn't been the same since, this is the product for you. You must use it correctly, meaning you cannot condition after you shampoo-however, this does not mean you can't use a pre-poo conditioner to detangle your hair. Condition, detangle, shampoo twice, gently towel dry, and then apply this product. I dyed my hair once and the curls weren't the same. Frizzy, undefined, no structure, dull, and just so fugly. Today after using k18 for a few months, my hair is strong, defined, shiny, and beautiful! I'll let the photos speak for themselves.
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8 people found this helpful
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Reviewed in the United States on November 9, 2023
Size: 0.51 Fl Oz (Pack of 1)Verified Purchase
I have naturally Hermione hair, from the first Harry Potter movie. Super fuzzy & frizzy, and then I dye it on top of that. The first time I used this I noticed a hint of shine I hadn’t seen for a while (still a bit, but less frizz), second time even better, by the 3rd & 4th my hair was so perfect. Great shine & manageability with no frizz. I didn’t put any other product in it. But after one wash not using k18 the frizz came back a good bit, 2nd wash it was back the the previous fluff from before I ever used it. Instead of regular shampoo, I used a cleansing conditioner ahead of time. For the two washes without I made sure I used a deep conditioning mask like I always do. Only reason I gave it four stars was because how freaking expensive it is for such a small amount. There’s no way to tell how much is left in the bottle. It’s so good that I don’t want to run out, so I’m considering buying the larger bottle. I’m not sure what the people with negative reviews did wrong, perhaps they needed to clarify silicone and other products from their hair better beforehand, or put too much on thinking more was better. I’d say if you’re considering this to get the larger size for the better value- I’m almost positive you won’t regret this purchase. I have never found any other product give such good results, the only issue is that it isn’t lasting like they claim. I’ve used the whole olaplex line, hundreds of leave-in conditioners & curl creams, maybe 5 different brands of gloss treatments, salon keratin treatments similar to Brazilian blowouts and none of them have been This awesome. I’m going to start using it only for special occasions, or when I’m trying to make good impressions. Oh & other people have mentioned the scent, which I don’t think is noticeable afterwards- it’s very lightly scented as either lotus or magnolia flower (I forget which scent corresponds). Doesn’t smell “chemically” scented or off putting.
97 people found this helpful
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Reviewed in the United States on July 30, 2024
Size: 0.51 Fl Oz (Pack of 1)Verified Purchase
Absolutely love this stuff! A little goes a long way so don’t use more than 3 pumps. I have long, thick hair and that’s all I need. I take a pump, rub it between my hand until your hands turn white. Then section hair. Work through that section avoiding the root. Repeat until you have all sections done. Of course if you have short hair it’s much faster and less pumps. No need to rinse out.

Let it sit on your head for at least 4 minutes before styling or adding other products. Then style as usual.

Makes my hair incredibly soft and manageable but without weighing it down or feeling greasy!
13 people found this helpful
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Reviewed in the United States on July 26, 2024
Size: 0.51 Fl Oz (Pack of 1)Verified Purchase
The cost of this product is expensive, and it is more than I usually spend on hair care products. However, desperate to find an effective product to tone down my frizz in this summer humidity, I bit the bullet and purchased it. To my great surprise, it worked! And a little goes a long way. It only takes a dab to get great results. The directions say not to condition hair before using the product so my hair does not feel as smooth as it usually does with my regular condition. That being said, my regular conditioner does not stand up to the humidity. It will probably not be a year-round product for me but it sure works for me now.
8 people found this helpful
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Reviewed in the United States on August 6, 2024
Size: 0.51 Fl Oz (Pack of 1)Verified Purchase
this is the biggest waste of money I've ever seen, . it says that three squirts, is what you should use but three squirts wouldn't cover the front section of my hair I don't even know what to say. 😩☹️ my hair is shoulder length, normal texture. there's more in the packaging than they're actually is inside the package.
5 people found this helpful
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Top reviews from other countries

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Amazon Customer
5.0 out of 5 stars MUY BUEN PRODUCTO
Reviewed in Mexico on August 14, 2024
Muy buen producto. Toma su tiempo pero funciona. Me llevó tres semanas rescatar mi cabello que estaba destrozado, pero pienso seguir usándolo esporádicamente para mantener mi cabello en buen estado.
B. Doyle
5.0 out of 5 stars Great product
Reviewed in Canada on July 28, 2024
I use this after the K18 shampoo. It acts as a conditioner and makes my hair feel soft and renewed.
Illa karla Ramos Araújo
5.0 out of 5 stars perfeito.
Reviewed in Brazil on May 20, 2024
fortalece bastante. com certeza vou comprar de novo.
Excelente compra . Desde el primer día de uso mejora tu postura . Lo recomiendo .
5.0 out of 5 stars Excelente mascarilla
Reviewed in Mexico on May 18, 2024
Size: 0.51 Fl Oz (Pack of 1)Verified Purchase
El precio es demasiado alto . Pero vale la pena 100%
3 people found this helpful
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Amazon Customer
5.0 out of 5 stars Expensive but worth it
Reviewed in Canada on April 29, 2024
Size: 0.51 Fl Oz (Pack of 1)Verified Purchase
The bottle is small but it lasts longer then you think and it really does make your hair so much healthier. Love this stuff.