Name: K18 Biomimetic Hairscience Leave-In Molecular Repair Hair Mask 50ml
Brand: K18 Biomimetic Hairscience
SKU: 858511001128
Price: 56.05 EUR
Availability: InStock
Rating: 4.2 (54 reviews)

★★★★★25. Juni 2025

OMG! OMG ! OMG! K-18 FULFILLS ITS CLAIMS Read on!

I’m over 55 and have spent decades trying everything — from $9 to $144 per product — hoping for softer, healthier hair. I have 3a curls hidden under years of color, heat damage, and dryness. My hair would break and frizz so badly it looked like I had layers (I don’t). K18 is the first and only product that actually delivered on its promise to repair — not just coat — my hair. I was fully prepared to return this if it did not make a difference. It did. This isn’t a conditioner or mask. K18 uses a patented technology that works from the inside out. I used a clarifying shampoo, applied 6 pumps (very small pumps from the "try it" bottle!), finger-raked it through damp hair, waited 4 minutes, and then combed through. No rinsing, no other products. I let my hair air-dry, and it already felt softer and smoother with significantly less frizz. No fragrance -makes me happy. Important note: You do not need to rub this aggressively between your palms to "activate" it — that’s a common myth. Just rub your palms lightly so you can apply it evenly and let the science do the work. It works on the keratin molecules to repair your hair from the inside out. Friction is not going to make the molecules smaller. Don't know why people start these rumors. The next morning, I used my straightener on medium heat and was stunned. Instead of the usual dry straw, my hair was sleek, shiny, and bouncy. Even the ends curled beautifully — something I’ve never seen on my hair before. After four treatments, my hair now feels different, although the greatest results came after the very first use. My hair is softer, smoother, more manageable, with less frizz and more shine. Even in Florida’s 90°+ heat and humidity, it holds up — and I’m not using anything else but K18. A friend even asked to try it after seeing my results. It’s expensive, but absolutely worth it. I’ve already bought the larger bottle. I’m sticking with K18 — this changed everything for me. And to address the expense, the 50mL pump provides 50 pumps. That's 25 applications for me. My average thickness, long hair uses 2 full regular pumps. After the first 4 applications, you move to every 4 washes. That means after the first four treatments, I have 21 treatments more still in the pump bottle. For me, with super dry hair, that means it will last another 18-21 weeks since I only wash once a week, and an occasional "extra". I am going to guess I have taken at least $100 of products that did not work for me to the women's shelter over that time, meaning the waste was as much as this effective product that takes no time to use, packs easily in a suitcase, doesn't stink and IT WORKS! If you have super straight, silky hair, like Asian hair, or other non-porous hair, I do not think you are going to get the same results. You probably already have the kind of hair those of us with porous, damaged hair are looking for. Ask ChatGPT

GGVerifizierter KaufHilfreich (543)

★★★★★4. Juni 2026

My Go-To Reset When My Hair Starts Looking Damaged

I keep coming back to K18 whenever my hair starts looking dry, rough, or overprocessed, and it has become one of those products I consistently reorder. My hair goes through a lot between heat styling, color treatments, and everyday wear and tear, so there are times when it starts feeling brittle and losing its shine. This is usually the product I reach for when that happens. The application process is simple. After shampooing, I skip conditioner, towel dry my hair, and work a small amount through the mid-lengths and ends. A little really does go a long way. After letting it sit for the recommended four minutes, I style as usual. What stands out most is that it improves the condition of my hair without making it feel coated or heavy. Many repair products leave my hair soft initially but weigh it down or create buildup after repeated use. K18 manages to restore softness, smoothness, and bounce while still letting my hair feel like hair. I notice less frizz, better manageability, and a healthier appearance after just a few uses. I’ve used this treatment multiple times over the years whenever my hair needed extra help, and it consistently delivers. It works particularly well after periods of frequent heat styling or color processing when my ends start looking tired and dry. In summary, this remains one of the most effective repair treatments I’ve used. It helps bring damaged hair back to life, improves softness and manageability, and does so without sacrificing volume or weighing my hair down. It is one of the few hair treatments I continue to repurchase because the results are noticeable every time.

Amazon CustomerVerifizierter KaufHilfreich (57)

★★★★★10. Juli 2026

Absolutely Worth the Hype

I’ve tried a lot of hair products over the years, and K18 is one of the few that actually lived up to its promises. After just a few uses, my hair felt noticeably softer, smoother, and much stronger. It helped reduce frizz, made my hair easier to brush, and gave it a healthier look without weighing it down. A little goes a long way, so the bottle lasts longer than I expected. I especially noticed a difference on my dry, damaged ends from heat styling and coloring. My hair looks shinier, feels healthier, and doesn’t break as easily. The price is definitely higher than most hair products, but because you only need a small amount and it actually works, I think it’s worth the investment. If your hair is damaged, overprocessed, or just needs some extra care, I highly recommend giving K18 a try.

Michelle Christmas HubbsVerifizierter KaufHilfreich (16)

★★★★☆20. Juni 2026

A little pricey for the size but definitely works.

Because of the high price I was reluctant to purchase this. But with all the hype and the fact that my granddaughters thick, beautiful curls desperately needed something that would redefine them and calm the frizz. I made the purchase. I’m so glad I did. The smell alone is almost worth the price, just wow. Smells amazing. We’ve tried so many other products but I have to say if I could afford it, this is the only one we’d be using on a regular basis. I purchased the detox shampoo and leave in oil to use as a three step system and it’s like magic. This is a pretty small bottle but we’re getting quite a few uses out of it. Once it’s gone I’ll use her other products but I’ll always repurchase this like every other month just to keep those curls in check. Reason for taking off one star is because of small size considering the higher price. It really works though so I’d recommend it.

StephJVerifizierter KaufHilfreich (15)

★★★★★27. Juni 2026

K18 Leave-In Molecular Repair Hair Mask Review.

I have been using the K18 Leave-In Molecular Repair Hair Mask and I am extremely happy with the results. It is very easy to use and fits perfectly into my hair care routine since it only takes a few minutes and does not require rinsing. My hair feels noticeably stronger, softer, and healthier after using it. I have also seen a reduction in breakage, especially on my color-treated and damaged hair. I like that it works at a deeper level to repair hair, and it does not leave my hair feeling heavy, greasy, or sticky. Instead, my hair feels light, smooth, and more manageable. Overall, I would highly recommend K18 to anyone with bleached, damaged, or fragile hair looking for a powerful repair treatment that delivers real results.

Midalys PerdomoVerifizierter KaufHilfreich (14)

★★★★☆25. Mai 2026

Tiny bottle, but absolute magic for greasy hair!

I was a bit shocked by how small the bottle was for the price, but let me tell you—it is worth every single penny. Before using K18, my hair would get greasy so fast that I had to wash it every other day. Since adding this to my routine, my hair stays clean, fresh, and lightweight for days at a time. A little goes a long way: You truly only need about 3 to 4 pumps. The trick is to rub it thoroughly between your hands until it turns white/emulsifies before applying. I’ve had my bottle for about two months now, using it 1–2 times a week, and I still have product left. Don't let the size fool you; it lasts! Highly recommend if you’re willing to pay $30 every three months.

Emily DellVerifizierter KaufHilfreich (14)

★★★★★13. Juli 2026

Worth it! Do it!

I was a little hesitant to order because it is pricey for a 1.7oz bottle but this product is small but mighty! It works wonderfully for hair that is highlighted or has bleach damage that is unavoidable. It leaves your hair feeling amazingly soft and rejuvenated. This mask smells light and fresh unlike some overpowering smells you get with products!

elizabethVerifizierter KaufHilfreich (10)

★★★★★9. Juli 2026

AMAZING

It works! I went from black to platinum to black box dye and now want to be blonde again. I’ve done one color remover and 1 @ 30v w/level 9 bleach followed by 3 @ 20v w/bleach. Each time using foils all over my head. Each process done one day after each other. My platinum that was under the black box dye ended up melting off with breakage all over which I knew it would end up doing. I’m now a level 8/9. My hair feels awful and all the conditioner masks and coconut oils helped but no match to my over processed bleach hair. Today I did the k18 and no joke it feels smooth again after only 5 minutes with no conditioner! AMAZING. I’m a big believer and will continue to use this. Giving my hair a rest for 2 weeks before I continue with my next stage w/bleach baths to get my all over 9 to 10 and will focus on my roots. The pics attached is my platinum hair before going to black box dye on my after pic. My current hair I have not yet provided a pic but will once I’m done.

margaretVerifizierter KaufHilfreich (9)

★★★★★13. Juli 2026

The First Product That Actually Helped My Damaged Hair

About ten months ago, my hair was badly damaged during my wedding hairstyle. It was overheated to the point that it started breaking, became almost impossible to brush, and I developed constant tangles at the nape of my neck. I had never experienced anything like that before. Over the last ten months, I’ve tried quite a few products, hoping to find something that would actually help. So far, K18 has been the only one that has made a noticeable difference. I’ve been using it for about four weeks exactly as directed (shampoo only, no conditioner before applying K18), and here’s what I’ve noticed: • The tangles at the nape of my neck are gone. • My braid feels noticeably thicker. I don’t think I suddenly grew more hair in four weeks, but my hair feels stronger and denser. • My hair has a healthy shine without looking oily. • It’s much easier to brush and doesn’t keep tangling throughout the day. • Most importantly, my hair finally looks well cared for. I actually enjoy wearing it down again because it looks smooth, shiny, and healthy instead of dry and damaged. I’m not calling this a miracle product because I don’t think four weeks is enough time to judge long-term results. Hair recovery takes time. I will definitely buy the full-size bottle and continue using it. I’ll also come back and update this review because I believe four weeks is simply too soon to evaluate a product that’s designed to repair damaged hair. I’m hoping I’ll be able to maintain these results while using it less often, but only time will tell.

Alla HVerifizierter KaufHilfreich (8)

★★★★★7. Juli 2026

Best hair product ever

K18 leaving molecular is the best hair product I have ever found. I have been using it for years and have no intention of ever stopping. It is a game changer as far as making your hair soft, hydrated, healthy and frizz-free. I have changed other hair products I've used over the years. But I will not change my use of K 18. I have tried other products that claim to do the same thing and none of them come close.

RedVerifizierter KaufHilfreich (5)

★★★★☆13. Juli 2026

Great Results, but a Bit Pricey

I’ve been using the K18 Leave-In Molecular Repair Hair Mask on my color-treated and damaged hair, and I’ve noticed a real improvement in how soft and healthy it feels. My hair looks smoother, feels stronger, and has less frizz after using it consistently. I also like that it’s lightweight and doesn’t leave my hair greasy or weighed down. The application is simple, and since only a small amount is needed, a little product goes a long way. It works especially well when following the instructions and using it as part of a regular hair care routine.The only reason I’m giving it four stars instead of five is the price. While the product performs well, it is expensive for the amount you receive, so it may not fit everyone’s budget.Overall, I think it’s a high-quality treatment that delivers noticeable results, especially for damaged or chemically treated hair. If you’re willing to invest in your hair care, it’s definitely worth trying.

The Marnie Edit ✨Verifizierter KaufHilfreich (4)

★☆☆☆☆28. Juli 2026

Didn’t notice a difference

I’m not sure what everyone is raving about. I didn’t notice a single thing different. I’m a hairstylist. I know how to apply product and I didn’t notice a single thing different about my hair.

Aimee SztapkaVerifizierter KaufHilfreich (2)

★★★★★25. Juli 2026

This is a miracle must have product to revive processed hair

K18 is a necessity for compromised colored/lightened hair - it's worth the investment. It's a miracle product on processed hair it moisturizes, smooths frizz, makes hair soft again, adds natural shine and makes hair manageable again. Has a light fragrance and a little goes a long way if you use the product correctly. *Read and make sure to follow the directions on the box - need to really emulsify it into a cream in your hands prior to working it through your hair.

✨beautyhealthfitness✨Verifizierter KaufHilfreich (1)

★★★★★27. Juli 2026

Makes hair smooth and healthy looking

I’m a fan. Just tried this and it is a game changer. My hair looks so much healthier.

SuzyDVerifizierter KaufHilfreich (1)

★★★★★26. Juli 2026

highly recommend

This is a must have for people who are over 40 years old. This product is the real deal.It does do miracles, highly highly recommended

seveVerifizierter KaufHilfreich (1)

★★★★★26. Juli 2026

This product will fix your hair

This hair mask is everything it says it is. An actual hair miracle. My hair got wrecked by a bad permanent wave. Dried frizzed mess. This restored it to smoothness and even shiny. I cannot believe how good the product is and how little you use. Highly recommended, the hype here is real.

kolVerifizierter KaufHilfreich (1)

★★★★★15. Juli 2026

Worth every penny!

I am amazed at how well this worked on my fine, thin, post menopausal, color treated hair. Over the years I have tried many different products to improve the look of my damaged frizz prone hair. I read the reviews but was skeptical as nothing has ever worked to improve the condition of my hair. I have been using clip in extensions for 15 years to add volume and cover up the look of my sad head of hair. Since starting this treatment 8 weeks ago (as directed) I have been able to ditch the extensions. The frizz is gone and the texture and volume have significantly improved. For the first time in many years I was complimented on my hair. Will definitely purchase again and again.

LisaVerifizierter KaufHilfreich (1)

★★★★★27. Juli 2026

Great!!

My hair was recently bleached and colored, and my hairstylist recommended this product to help with the damage. I could definitely see a difference after using it.

Ruka HuangVerifizierter KaufHilfreich (1)

★★★★★23. Juli 2026

Totally works

This product really works. I bleached my hair and it was totally damaged. Thin, breakage and burt. Tried many treatments and they were good but when I used the K18 I felt the difference . My hair became less noticeable damage and even that I had to cut my hair since it was beyond repair I will keep Using K18 cz I still have damage hair.

lourdes haleVerifizierter KaufHilfreich (1)

★★★★★25. Juli 2026

incredible. no notes

i didnt want to believe the hype bc of the price but wow. at this point, im addicted and i can never go back. and this scent is incredible. my hair is SO soft and it smells amazing for days. I have waist length hair and 2 pumps is plenty.

LaurenVerifizierter KaufHilfreich (1)

★★★★☆11. Juli 2026

Formula changed

I have been using K18 for 2 yrs and has been worked to prevent breakage. The consistently was a creamy but my last order, the product was more like a serum. I order through their store front but wondering if this could be a counterfeit. Did they change the formula?

Sarah LVerifizierter KaufHilfreich (1)

★★★★☆27. Juli 2026

Na

Expensive, but its a go to for me w highlights to help w the breakage

Debbie DennisVerifizierter KaufHilfreich (1)

★☆☆☆☆25. Juli 2026

Not worth the money

Very disappointing. I have long straight dirty blonde hair that hasn’t been colored in a few years and I rarely use product on my hair. It’s been getting frizzy so I figured I’d give it a try. But I got dupped by the hype and didn’t check the ingredients. Smells very strongly of alcohol and dried my hair out with only 3 pumps.

JoannaVerifizierter KaufHilfreich (1)

★★★★★22. Juli 2026

Healing my hair!

My ends felt so dry but after using this just one time they felt so hydrated again! I am hopeful that this will continue to heal the damage that coloring has done to my hair. Leaves my hair so soft too!

EliciaVerifizierter Kauf

★★★★★14. Juli 2026

Worth the price tag!

Amazing product. Wish I could give it more stars. I used this with the k18 hair oil. This photo is after the 3rd treatment. Instructions say 4-6 treatments… so it’s just going to get better from here. For reference I’m naturally a very dark brow. This is my hair after two rounds of bleaching. Before the k18 it was very dry and easy to tangle. Bleach does a number on your hair. I don’t leave a lot of reviews and I try a lot of products. This one delivers. My hair is back to a healthy texture. It’s a small bottle and a big price tag, but it packs a punch. You won’t be disappointed.

Trisha PizzoVerifizierter Kauf

★★★★★25. Juli 2026

Mejorar tu cabello

Lo adoro lo mejor para el cabello maltratado y seco

YunisleidyVerifizierter Kauf

★★★★★23. Juli 2026

Perfect

I love it, it really helps with my bleached hair.

Aleida CastruitaVerifizierter Kauf

★★★★★19. Juli 2026

Best product for dry damaged hair

I have used this 3 times now and I am extremely impressed. I have damaged hair from coloring every 4 weeks. I have tried all kinds of conditioners and masks and none compare. I was worried the first use about not using conditioner and honestly. I don’t even need it with this product.

Amazon CustomerVerifizierter Kauf

★★★★★26. Juli 2026

great product, shiny and full hairstyle, a little goes a long way

Product is great but delivery was not AC and in 110 heat it is a problem in az

Amazon CustomerVerifizierter Kauf

★★★★★22. Juli 2026

Love!

This is absolutely amazing! Even though the instructions say to use Max three pumps, I sometimes used four or five because I have a lot of hair. I didn’t notice any bad side effects. It changed my newly bleached hair from dry, brittle, and matted in the shower to soft and silky after several uses. Definitely trust in this product.

America S RevereVerifizierter Kauf

★★★★★24. Juli 2026

Very Good Product

K18 gives excellent manageability, good fragrance and softness. f you have extremely fine hair don't use it after every shampoo. Once every three or four weeks should do it.

Avid ReaderVerifizierter Kauf

★★★★★21. Juli 2026

Buy!!!

I have long naturally blonde hair. I love to swim a lot and last year I did not have a chance to shower after being a heavily chlorinated pool and it ruined my hair. I’ve only been using this for three days and the difference is huge. 10/10 recommend I will be buying this again. It’s repairing my hair and I’m getting my straight texture back. No more straw hair for me and I’ve tried just about everything.

Barbara ShepherdVerifizierter Kauf

★★★★★28. Juli 2026

Rapidez

Muy bien y cumplidos

Carolina diazVerifizierter Kauf

★★★★★27. Juli 2026

Game changing product for damaged hair

Not enough stars to accurately rate this product. My hair was destroyed by bleaching and dying it to fix a bad color and k18 saved it. Not only does it look better it feels better. I love this so much.

Christina AllenVerifizierter Kauf

★★★★★24. Juli 2026

Mascarilla molecular capilar

Muy buen producto

diorayma docandoVerifizierter Kauf

★★★★★24. Juli 2026

Best hair repair absolutely worth

Linda RodriguezVerifizierter Kauf

★★★★★23. Juli 2026

Great product

Really love it.

Marli AnselVerifizierter Kauf

★★★★★27. Juli 2026

Great product

My hair looks so good!

Massiel MartinezVerifizierter Kauf

★★★★★19. Juli 2026

Yep get it

Resounding yes, it works. Hair had a combination of issues from assorted hair color techniques and errors from both home and salon. Shaving all of my hair off wasn't a good option due to my situation so...K18. I had previously had some help from Dove, bondi boost, that one mask, etc but things got to the point where they weren't helping anymore. Enter K18... I followed the instructions to a T. After the third or fourth day of using it after shampooing and towel drying, I decided to switch back over to shampoo and a moisturizing conditioner to see if it would soften it more. It did. My hair feels more normal again as each day passes. I even used Vo5 shampoo and conditioner at a friend's house and my hair felt fantastic after (and smelled like strawberries ha), but normally that stuff isn't enough for my coarse and dry and damaged hair. Will have to get more of this as it is effective. I didn't really notice a fragrance.

Some LadyVerifizierter Kauf

★★★★★26. Juli 2026

Us very little when applying

Highly effective

Stefani torresVerifizierter Kauf

K18 Biomimetic Hairscience Leave-In Molecular Repair Hair Mask 50ml

OMG! OMG ! OMG! K-18 FULFILLS ITS CLAIMS Read on!

My Go-To Reset When My Hair Starts Looking Damaged

Absolutely Worth the Hype

A little pricey for the size but definitely works.

K18 Leave-In Molecular Repair Hair Mask Review.

Tiny bottle, but absolute magic for greasy hair!

Worth it! Do it!

AMAZING

The First Product That Actually Helped My Damaged Hair

Best hair product ever

Great Results, but a Bit Pricey

Didn’t notice a difference

This is a miracle must have product to revive processed hair

Makes hair smooth and healthy looking

highly recommend

This product will fix your hair

Worth every penny!

Great!!

Totally works

incredible. no notes

Formula changed

Na

Not worth the money

Healing my hair!

Worth the price tag!

Mejorar tu cabello

Perfect

Best product for dry damaged hair

great product, shiny and full hairstyle, a little goes a long way

Love!

Very Good Product

Buy!!!

Rapidez

Game changing product for damaged hair

Mascarilla molecular capilar

Best hair repair absolutely worth

Great product

Great product

Yep get it

Us very little when applying

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