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🧬 Unlock your hair’s molecular magic in 4 minutes—because damaged hair is so last season.
K18 Leave-In Molecular Hair Mask is a 50ml peptide-powered treatment that repairs and strengthens hair damaged by bleach, color, chemical services, and heat in just 4 minutes. Its patented K18PEPTIDE technology works at the molecular level to restore softness, strength, and bounce for all hair types. This lightweight, leave-in formula requires no rinsing and replaces conditioner, offering a cruelty-free, vegan, and silicone-free solution trusted by thousands of users worldwide.

| ASIN | B0961ZS96M |
| Age Range Description | Adult |
| Age range (description) | Adult |
| Benefits | Clinically proven to repair, restore strength and sustain hair damaged by bleach, color, and chemicals. |
| Best Sellers Rank | 275 in Beauty ( See Top 100 in Beauty ) 1 in Hair Masks |
| Brand | K18 |
| Brand Name | K18 |
| Country Of Origin | USA |
| Customer Reviews | 4.3 out of 5 stars 32,309 Reviews |
| Global Trade Identification Number | 00858511001128 |
| Hair Conditioner Type | Hair Conditioning Mask |
| Hair Type | All |
| Hair type | All |
| Item Dimensions | 47 x 47 x 102 millimetres |
| Item Form | Cream |
| Item Highlight | Peptide Hair Treatment Mask, For Bleach, Colour, Chemical & Heat Damaged Hair, Immediate & Lasting Damage Reversal in 4 Min |
| Item Type Name | Hair Mask |
| Item Weight | 3.2 Ounces |
| Item form | Cream |
| Liquid Volume | 50 Millilitres |
| Manufacturer | K18 |
| Manufacturer Part Number | K18-31005 |
| Material Features | Cruelty Free, Natural, Vegan |
| Material Type Free | Silicone Free |
| Material feature | Cruelty Free, Natural, Vegan |
| Model Number | K18-31005 |
| Number of Items | 1 |
| Package Type Name | Bottle |
| Product Warranty | 2 year manufacturer |
| Product benefits | Clinically proven to repair, restore strength and sustain hair damaged by bleach, color, and chemicals. Product benefits Clinically proven to repair, restore strength and sustain hair damaged by bleach, color, and chemicals. See more |
| Recommended Uses For Product | Repair Damaged Hair |
| Scent Name | Fresh |
| Size | 50 ml (Pack of 1) |
| Special Features | Not Tested On Animals |
| UPC | 858511001029 858511001128 729162271362 729162270877 755801147958 726929222179 729162271317 729162271249 729162271096 |
| Unit Count | 50.0 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
J**E
Excellent
Since having my hair highlighted, it has felt like straw. I’ve tried so many products and spent a fortune trying to improve it. I was nervous about using the K18 mask without conditioner because I thought I’d never get a comb through my hair, but the result has been unbelievable. I used the K18 oil as well, and my hair feels so much smoother. I’ve been out in the wind and mist today, which would normally have turned it into a haystack, and it’s still smooth. I’m so pleased with it!
M**S
Very happy with my much improved hair
I have used this product after 4 washes so far and even after the first use my hair looked and felt in much better condition. It now feels smoother and looks so much better. I have tried so many products to help my thinning, fine, frizz prone hair but most just add oil and make my already oily scalp more oily and my hair would look greasy even though just washed. It is expensive but, I have wasted so much money in the past on other recommended products. If this keeps giving these super results I will definitely order again.
S**Y
Tiny but brilliant.
I know it's a little pricey but it has transformed my hair. From dull, frizzy and lifeless to bouncy, full and shiny in around 3 or 4 uses. I have very fine, long hair and it was dry, brittle and lackluster before i tried this product, leave in conditioners left my hair heavy and awful. But this prouct is simple to use, very little goes a long way and i don't need to add any other products at all. It's a little hair miracle in a (very) tiny bottle. I've now ordered the full size and can't wait for it to arrive!
J**E
Not a lot of product for the money.
Product is good but there was barely anything in the bottle for £30. I don’t mind paying for products that work, but it’s not worth how much it would be per drop.
B**E
This works!
This has transformed my hair. I have very fine and fragile hair that breaks easily. I have never been able to grow it long because it gets so broken and shaggy. With this I have been able to grow my hair longer than usual and it gives an amazing shine. I will still never be able to have very long hair but I have actually never used a product that works as well as this. You don't use conditioner with this, and a small amount goes a long way. It is VERY expensive but when you have hair like mine it is worth it. I just put it on the ends and use a tangle teaser to comb through and let it air dry. Once it dries my hair feels a little crunchy at first but once I brush it through again it feel silky soft and shiny. It's definitely a five star product in terms of quality and ingredients but I've knocked a star off because of the high price, which also recently went up.
E**I
You will see the change after the first use.
It is a fantastic product for my hair
J**E
Highly recommend
Bought this as my hair was breaking quite badly and couldn’t get a brush through it even after conditioning after using this for several days my hair was so much better. Only a tiny pot but lasts for ages as you don’t need to use much.
C**N
Cumple las expectativas
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.
I**O
perfeito.
fortalece bastante. com certeza vou comprar de novo.
M**G
Fantastiskt
Helt fantastisk resultat redan efter första behandlingen. Så bra för mitt hår som tagit en del stryk av färgbehandlingar. Kommer verkligen att fortsätta med det här.
Y**H
effective!
I can say that this product was good but i think the product was too small for the price.
D**Y
Saved my hair after harsh processing.
I have used this product several times over the last couple of years. I started using it during Covid when I allowed my hair to go gray. We ended up stripping the rest of the color out of it which weakened my hair strands. I was looking for something that would help with that when I came across this product. I believe it actually saved my hair after the harsh processing. It is expensive, but well worth it if you’re looking to save your hair! It takes very little product to do wonders. It’s very easy to use. After you dry your hair, you put a small amount ( do the amount the instructions say. You need very little!) in your hands and massage it through the ends up to the scalp. I’m always surprised at how much my hair appreciates this product when I haven’t used it for a little bit. Even though I’m not having any additional processing done on my hair, I’m completely gray now, I am using it currently because my hair has felt kind of dry and lifeless. Already within two days I see a huge difference! It has a light pleasant fragrance, is not greasy. I highly recommend!
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