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🧬 Repair your hair’s future in 4 minutes—because damaged hair is so last season.
K18 Leave-In Molecular Hair Mask is a cutting-edge, vegan hair treatment that reverses damage caused by bleach, heat, color, and chemical services in just 4 minutes. Powered by patented K18PEPTIDE technology, it penetrates at the molecular level to restore softness, strength, and bounce without rinsing. Designed for all hair types and free from parabens, silicones, sulfates, alcohol, and artificial dyes, this mask offers professional-grade repair in a convenient leave-in formula trusted by thousands.













| ASIN | B09HR5KSR8 |
| ASIN | B09HR5KSR8 |
| Age Range Description | Adult |
| Benefits | Reverses damage in 4 minutes |
| Best Sellers Rank | 485 in Beauty ( See Top 100 in Beauty ) 1 in Hair Masks |
| Brand Name | K18 |
| Country Of Origin | USA |
| Country of origin | USA |
| Customer Reviews | 4.3 4.3 out of 5 stars (28,395) |
| Customer reviews | 4.3 4.3 out of 5 stars (28,395) |
| Date First Available | 26 Sept. 2022 |
| Global Trade Identification Number | 00858511001289 |
| Hair Conditioner Type | Deep Hair Conditioner |
| Hair Type | All |
| Item Dimensions | 35 x 35 x 81 millimetres |
| Item Form | Cream |
| Item Weight | 1 Ounces |
| Item model number | K18-31007 |
| Liquid Volume | 15 Cubic Metres |
| Manufacturer | K18 |
| Manufacturer | K18 |
| Manufacturer Part Number | K18-31007 |
| Material Features | Molecular Repair, Vegan |
| Material Type Free | Free from parabens, silicone, sulfates, alcohol, and artificial dyes |
| Model Number | K18-31007 |
| Number of Items | 1 |
| Package Type Name | Tube |
| Product Dimensions | 3.48 x 3.48 x 8.08 cm; 28.35 g |
| Product Warranty | 2 year manufacturer |
| Recommended Uses For Product | damaged hair |
| Scent Name | Fresh |
| Size | 15 ml (Pack of 1) |
| Special Features | Molecular Repair |
| UPC | 858511001289 746559900490 858511001371 |
| Unit Count | 15.0 millilitre |
C**N
Noticeably stronger hair, but you must use it correctly
I was very curious to try the K18 Leave-In Molecular Hair Mask because my hair has been through a lot: bleach, colour, and heat styling. After a few uses, I can honestly say it does make a difference, but it’s not exactly a miracle in one wash. First, it’s important to follow the instructions: shampoo, skip conditioner, towel-dry your hair, and apply a small amount. You really only need a tiny pump. The product feels light and not greasy, which I like, and it doesn’t weigh my hair down. After about 3–4 uses, my hair started to feel stronger and less brittle, especially on the ends where bleach damage is the worst. It doesn’t make the hair super silky like a traditional mask, but it improves the structure of the hair over time. My hair feels healthier and looks a bit smoother. The downside is the price for such a small bottle. Also, if you’re expecting instant softness like a regular deep conditioner, you might be disappointed because that’s not really what this product is designed to do. Overall, it’s a very interesting treatment for damaged hair and I can see why it’s popular. It takes consistency, but it does help improve the strength of over-processed hair
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.
V**B
K18 is a total Game Changer
This has totally changed my life! Having had long, lanky and extra fine hair I decided to have blonde highlights to try and give it volume. I found an excellent colour technician who came highly recommended and she recommended I use K18 once a week. Well, this has been an absolute game changer! I even get compliments from family and friends which never happened before. My hair seems to have improved in strength, is glossy and very easy to manage. Every day looks like a fresh out of the salon day. Yes, it’s pricey but you only have to use a very small amount once a week. It should last for ages at this rate. Whatever magic ingredient is in this the inventor has to applauded. I will keep on recommending it as I’m so happy. Just buy it and see for yourself.
K**E
Great
Really helps damaged or dry hair. Fantastic product
L**A
Hair greasy straight away
Made my freshly washed hair extremely greasy straight away to the point that I had to rewash straight away. I also used very little. Very expensive and straight in the bin. Wow products are far superior
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.
J**A
This works if you actually need it.
I think alot of people use K18 without understanding if they need it or who it is for. My hair at one time felt really dry and I asked my hairdresser about K18 and she stated that I did not need it K18 and is it is a product designed for damaged hair. Another occasion I had really bad heat damage on my side fringe caused by a combination of bleach and GHD's. It couldn't be cut out because of where it was and it would have looked odd. At that point I was advised to use K18. A little goes a really long way. It is also not designed to be used for an extended period with every wash. It is a treatment. If you do not apply it correctly then it will not worked. If you apply it without towel drying your hair or if you have used a conditioner beforehand it will not work. The conditioner prevents K18 from penetrating the hair and doing it's job. When I applied it to my very frazzled side fringe within a few uses it had significantly reversed the damage. I have found it has done more for my hair than Olaplex, even though they do very different things. K18 fixes my hair far more effectively than Olaplex has ever prevented any damage from bleaching. If you overuse this product or use it when you don't need it then it will actually make the condition of your hair worse. It is very expensive but it is only supposed to be used to reverse the damage then you should stop using it. If your hair is in a worse condition, then it is likely you didn't need it and if it hasn't done anything its possible you haven't used it correctly. Also Amazon is an official stockist of K18 so as long you haven't purchased it from a seller that isn't K18 then you will get a legitimate product. In short, it's pricey but effective as long as you use it right and actually need it.
C**N
Tenía dudas por algunos comentarios que había leído sobre que no era para tanto, pero realmente puedo decir que funciona desde el primer uso. Mi pelo está decolorado, además llevo peinado bob, por lo que suelo peinar con calor y está rompiéndose. Aposté por este producto por su fama y puedo decir que desde el primer lavado se siente el pelo con más peso y menos fragilidad. Evidentemente si buscáis que solucione la rotura, seamos realistas, ningún producto lo hará. Si quieres mejorar la calidad de tu pelo y recuperar parte del daño, pruébalo. Es caro sí, pero los buenos productos lo son. No se necesita aplicar demasiado producto como cualquier producto de calidad.
E**N
Leverans som utlovat. Produkten gör mitt silkesmjukt, mycket nöjd än så länge!
J**R
Très efficace
I**O
fortalece bastante. com certeza vou comprar de novo.
N**A
very good product
Trustpilot
1 week ago
2 weeks ago