

🧴 Repair your hair’s DNA in 4 minutes—because damaged hair is so last season!
K18 Leave-In Molecular Hair Mask is a revolutionary 50ml treatment that repairs and reverses hair damage caused by bleach, color, heat, and chemicals in just 4 minutes. Powered by patented K18PEPTIDE technology, this lightweight, silicone-free formula penetrates deep into the hair’s core to restore strength, softness, and elasticity without rinsing. Suitable for all hair types, it delivers salon-grade, lasting repair and bounce, making it a must-have for professionals and trendsetters who demand healthy, resilient hair.













| ASIN | B0961ZS96M |
| Best Sellers Rank | 488 in Beauty ( See Top 100 in Beauty ) 1 in Hair Masks |
| Country of origin | USA |
| Customer reviews | 4.2 4.2 out of 5 stars (27,176) |
| Date First Available | 2 May 2021 |
| Item model number | K18-31005 |
| Manufacturer | K18 |
| Product Dimensions | 4.75 x 4.75 x 10.16 cm; 90.72 g |
K**N
The best!
Regular heat and bleach is used on my hair and was incredibly damaged. This helped to reverse the damage in 6 weeks and I now use it as maintenance once a week. It is very pricey but definitely worth the money if used correctly. Shampoo, towel dry hair, apply and wait 4 minutes minimum then condition as normal. I also use a hair mask after conditioner and my hair has never felt better.
K**E
Great
Really helps damaged or dry hair. Fantastic product
S**M
The best leave in mask for damage ever.
This stuff is a game changer in a bottle. It’s expensive, but worth it. You only need to use it once a week really anyways. Doesn’t leave my hair greasy but does a great job of making it feel brand new.
S**E
Product packaging
Was really excited for this product as I heard so many good things about it however when I opened it it was damaged and the product had leaked out. Had to throw away as it wasn’t useable. Really upset about this and won’t be buying another one.
C**W
Some definite improvement
Admittedly I need a hair cut but this has definitely improved the texture and look of my hair. Is it a miracle cream? Mmmnn maybe not. Also did I need 12 pumps rather than 3? I absolutely did! This will not last me very long at all, hence the 4 rather than 5 stars. An expensive treatment for sure! My hair looks, feels and smells nice.
M**I
Like magic
Don't think, just buy it. My hair is thick and wavy and is quite damaged due to heat and colouring. I tried Olaplex before but it didn't really helped my hair. K18 worked like magic, I've used it 3 times and my hair just looks and feels healthy! Defo worth the money
K**.
Buy it!
My hair was damaged, dry & dull. It was really affecting me & after spending so much money on products and getting no results this was a final resort. I am so impressed, It has given my hair life again! It’s shiny, sleek & much healthier. I 1000% recommend this product
H**S
Not sure...
I'm really not sure about this product. I do, however, have opinions. Ultimately the jury's out about the benefits and healing treatment on the hair long term, I have a few more uses left. I think my thoughts (which are complicated) could best be summed up as pros and cons for brevity's sake. Pros: - I fried my hair trying to add an auburn sheen - I used to dye my hair a lot and should have known better than to try again, but I was not prepared for the frizz I unleashed! Since the 2nd-or-so K18 application, my frizz is a lot less (but NOT gone!) - My hair does feel very soft - Frying my hair drastically reduced my natural curls, K18 may have helped start to bring these back - however changing my conditioner may have changed that too. Cons: - Price. Much like Olaplex, I feel this is very, very overpriced for what you get. The changes are not THAT amazing, and the amount of product is criminal. - Packaging. £30 for a 15ml, which is in an air-tight plastic pump that you cannot open to get any product left in the tube. I'm fully willing to bet there's a lot of product wastage there! - Hype. Hype never does anything any favours long term... yes, I think it helped with my damage from dying, but nothing's a miracle product and YMMV as to how much this helps you or not, how much a difference it makes or not. Personally it did make a difference for me, but I still expected more from the hype. - Long term benefit. I'm not sure about the long term pros of this product. - Method. How you're meant to use this product is very strict and I don't think it will work that well if you don't follow the instructions. Personally, my hair NEEDS a good conditioner, so having to omit conditioner... not so great. Also they recommend using it for multiple washes in a row - my hair cannot go multiple washes with shampoo each time and no conditioner each time, no way. And then there's the cost of using it for each wash, multiple washes in a row! - Amount. Goes back to price. I don't have masses of hair but I do have thick, longish hair and I could not make the amount they suggest stretch through all that. I had to use more, and that gets £££ as you burn through product. Ultimately, it's not a miracle product. It's a fairly decent product IF you have hair damage from chemical/heat, but if you're battling with just frizzy/thirsty/etc. hair I don't think it will do much. I do think the amount it will help you varies from person to person by a lot. And I really do think rave reviews, hype and marketing oversell how beneficial this product is. It is very expensive for what it is, and I think if you know your hair type and needs and have time to research or money to try new things, you can get better products which, if not cheaper, are at least more targeted for what you specifically need. It is marketed as a long term use product which is just not accessible price-wise for many people, myself included, and I don't know if the benefits will get any better than what it has already done for my hair. But it did help with damage in my specific circumstances - not to a miracle level but to a noticeable level. If you have the disposable income AND have chemical/heat damaged hair, give it a go. I would not splurge on a big size to begin with though, and I would be very, very realistic about the results and cost-to-impact you are going to see.
R**N
Second purchase now, and is impressive when using and left in hair as recommended. Styles well, and leaves hair soft and silky as opposed dry and bushy. However, the next day you would never know, so undecided if would purchase again a third time.
S**A
I**O
fortalece bastante. com certeza vou comprar de novo.
C**A
Would absolutely recommend to improve hair
Y**H
I can say that this product was good but i think the product was too small for the price.
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