

🧴 Repair your hair’s future, not just its surface.
K18 Leave-In Molecular Repair Hair Mask is a patented biotech treatment that uses a unique bioactive peptide to rebuild broken keratin chains inside the hair shaft. Designed for dry, frizzy, and chemically damaged hair, it delivers visible repair and renewed elasticity in just 4 minutes without rinsing. Suitable for all hair types, this leave-in mask offers lasting strength, softness, and bounce, making it a must-have for professionals seeking quick, effective hair restoration.












| ASIN | B0961ZS96M |
| ASIN | B0961ZS96M |
| Active Ingredients | Water (Aqua) (Eau), Alcohol Denat., PropyleneGlycol, Cetearyl Alcohol, Dicaprylyl Ether, Cetyl Esters, BehentrimoniumChloride, Polysorbate 20, sh-Oligopeptide-78, Hydrolyzed Wheat Protein,Hydrolyzed Wheat Starch, Isopropyl Alcohol, Tocopherol, Phenoxyethanol,Potassium Sorbate, Citric Acid, Fragrance (Parfum), Geraniol, Linalool, HexylCinnamal, Benzyl Alcohol. |
| Additional Features | Travel Size |
| Age Range Description | Adult |
| Best Sellers Rank | #126 in Beauty & Personal Care ( See Top 100 in Beauty & Personal Care ) #1 in Hair Treatment Masks |
| Brand Name | K18 |
| Customer Reviews | 4.3 4.3 out of 5 stars (27,994) |
| Global Trade Identification Number | 00858511001128 |
| Hair Conditioner Type | Leave-In Hair Conditioner |
| Hair Type | Damaged |
| Item Dimensions | 1.87 x 1.87 x 4 inches |
| Item Form | Cream |
| Item Weight | 3.2 Ounces |
| Item model number | K18-31005 |
| Liquid Volume | 50 Milliliters |
| Manufacturer | K18 |
| Manufacturer | K18 |
| Material Features | Natural |
| Number of Items | 1 |
| Package Type Name | Jar |
| Product Benefits | "Real, lasting repair powered by K18PEPTIDE™ Hair like new in 4 minutes* Soft, strong, bouncy hair for everyone " |
| Product Dimensions | 1.87 x 1.87 x 4 inches; 3.2 ounces |
| Recommended Uses For Product | Shampoo, skip conditioner. Towel-dry thoroughly. Apply 1-3 pumps from ends to roots (3-9 pumps for 15ml sized mask). Less is more. Wait 4 minutes, do not rinse. |
| UPC | 858511001029 858511001128 729162271362 729162270877 755801147958 726929222179 729162271317 729162271249 729162271096 |
| UPC | 858511001029 858511001128 729162271362 729162270877 755801147958 726929222179 729162271317 729162271249 729162271096 |
| Unit Count | 1.7 Fluid Ounces |
S**C
A Hair Treatment that Finally Works!
I was skeptical. At this price point for half an ounce, it better do something extraordinary. It does. I have color treated, heat styled hair that had reached the point of no return or so I thought. Breakage, frizz, that straw-like texture that no amount of conditioner fixes because conditioner just coats the hair, it does not repair it. K18 actually repairs it. The difference is in the science. It uses a bioactive peptide that reconnects broken keratin chains inside the hair shaft itself, which is something a deep conditioner cannot do. Application is simple. Shampoo, no conditioner, towel dry, apply a pea sized amount to your hair, do not rinse. That’s it. The first time I used it I thought I had done something wrong because it didn’t feel like anything. Then my hair dried. The texture was different. Softer, more elastic, less frizzy. Not a coating. Actual structural change. By the third use my stylist asked what I had done differently. The 15ml size looks tiny but a little goes a long way. I use it once a week and this bottle has lasted me over a month. PROS Visibly repairs damaged and color treated hair, not just coats it. Results build over multiple uses. A tiny amount goes a long way so the bottle lasts. No rinse formula means it fits easily into any routine. Noticeable difference in texture and elasticity within the first few uses. CONS The price is high, especially for 15ml. Takes a few uses before you see the full effect so patience is required. If your hair is not damaged you may not notice much difference. Must skip conditioner which takes some getting used to. If your hair is damaged this is not a luxury, it’s a repair tool. Worth every penny.
N**Y
K18 Leave‑In Molecular Repair Hair Mask
This leave-in mask is a game changer for damaged hair. After just a few uses, my hair felt noticeably stronger, smoother, and more manageable. It works quickly and doesn’t weigh the hair down like some other treatments. Even a small amount makes a big difference. It’s a bit pricey, but the results are definitely worth it if your hair is damaged from heat or color treatments.
S**S
My hairs secret weapon!
My stylist recommended this to me and I love it. I wish there was a bigger size though, especially since I have so much thick hair and probably go through it much quicker. I noticed a difference after the first time I used it-especially with my hair feeling softer. But it wasn’t really as noticeable until the third time. My hair is pretty damaged and I’m using it a couple time a week and it seems to really be reviving my locks. It’s not greasy or heavy and smells pleasant and I truly feel like it is a true product that actually does what it says and you can feel the difference in your hair.
D**T
Amazing Repair!
A friend told me about this great hair repair. My hair looked nice the day I washed and styled it. But by the next day it looked felt like straw. None of my conditioners helped. Left in or applied when styling. I was desperate to try anything. That’s when my friend told me about K18. It is pricey but…first you comb out your damp hair, then pump out a tiny amount. I usually use two dots worth. Rubbing my hands together I apply it to the areas on my hair that look drier on day two. You must wait 5 minutes. Then just finish your regular after shampoo routine. I have shoulder length gray hair and you don’t need much. My hair has shine and more body now. It’s not a conditioner but something that feeds your hair strands. Because you use so little with each application it does last a long time. It’s the most amazing product I’ve ever used.
R**E
works great but little product
This hair mask works really well and left my hair feeling noticeably softer, smoother, and more hydrated after just one use. It helped tame frizz and made my hair look healthier overall, so the quality is definitely there. My only complaint is the amount of product for the price — the container is smaller than expected and it goes pretty quickly, especially if you have longer or thicker hair. That said, it does deliver great results, so I just wish you got a bit more for what you pay.
A**S
Not worth the price
If I wash only and use this product, it seems to help my hair be smoother. No conditioner. No detangler. No oil. No anything else. I have to use 5-6 pumps of the tiny bottle to see a difference. And I only do mid shaft to ends. My hair is fine/thin and just past my shoulders. I haven't used it very many times, and the bottle is already having a hard time getting full pumps out without air. So I dont think its really worth the price for auch a tiny amount. There's no way to see if it works long term without spending a fortune on a bigger bottle. I've been trying to grow out the fried blonde hair and dying my hair close to my natural color to cover gray hair. My new hair growth is a lot healthier. But my ends are still fried and frizzy. There really isn't a scent to this product thankfully. I haven't noticed my hair get any shiner, just smoother and softer. I don't think I'll be buying another bottle.
D**K
Great product!
An awesome product! I have short, blond, highlighted hair and just a small drop of this makes my hair soft, shiny, easier to detangle, look healthier and more beautiful.
C**R
Good but SO EXPENSIVE for small amount!
It made my hair look and feel good but SO EXPENSIVE for very LITTLE amount of product 😩 I may only get two maybe three uses from this tiny bottle.
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.
E**N
Leverans som utlovat. Produkten gör mitt silkesmjukt, mycket nöjd än så länge!
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.
Trustpilot
5 days ago
1 month ago