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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 | 253 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 32,214 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
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.
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!
S**H
3-4 pumps then rub palms together until cream goes white, then rub onto ends of hair
K18 important thing . 3-4 pumps into palm then rub hands together until cream goes white then rub into ends of hair , I. Been using for two months now I can definatly feel and see the difference in my hair . Shame so expensive , but is very good
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**P
Extremely expensive but it actually does what it claims
Extremely pricey stuff but it actually works long term on my severely damaged, spongy-when-wet, straw-hay-when-dry peroxide blonde hair. I have noticed that with continued use my hair looks and feels smoother with less tearing and breakage.
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.
Trustpilot
2 months ago
1 month ago