Best treatment for damaged hair
I’ve been a longtime lover of olaplex and finally had the opportunity to try K18 and not disappointed. It has and continues to be an excellent treatment to use ...
K18 Leave-In Molecular Repair Mask 50ml SIZE: 50ml 4.5 of 202 reviews
SIZE: 50ml
4.5 of 202 reviews
Official Stockist
$99.95
4 installments of $24.99
Own it from $10/week
Most Helpful Positive
Is this for you?
A leave-in hair treatment to reverse chemical and physical damage to hair.
- Cruelty Free
- Sulphate Free
- Vegan
- Paraben Free
What customers say
Hair Concern:
- Breakage and split ends
- Dull, lacking shine
- Frizzy hair
Hair Curl Type:
- Curly
- Straight
- Coily
- Wavy
Hair Texture:
- Curly
- Straight
- Coily
- Wavy
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K18 Leave-In Molecular Repair Mask 50ml Reviews
4.5 of 202 reviews
87% recommend this product
Most Helpful Criticism
Improves hair condition
This has helped a lot with the condition of my hair and reducing breakage however I don’t love the feeling of it when left in hair
Improves hair condition
This has helped a lot with the condition of my hair and reducing breakage however I don’t love the feeling of it when left in hairBest treatment for damaged hair
I’ve been a longtime lover of olaplex and finally had the opportunity to try K18 and not disappointed. It has and continues to be an excellent treatment to use on my brittle, colour damaged hair. While olaplex is still good, time is of the essence and I often dont like to spend time waiting for treatments to kick in so K18 has saved a lot of time and may perhaps have better results.Good PR, bad results
I’ve been using this product for 6 months and my hair is more brittle and fluffy than ever. Not sure why every salon on earth switched from olaplex to this besides a great marketing team. There’s no way such a small amount can hydrate your hair when you’re not using conditioner, but if you try using a bit extra it feels terrible.Holy grail
I use this in place of conditioner every other wash even though my hair is no longer bleached or coloured. I will continue to buy this foreverADORE
I don’t know what I would do without my K18 anymore? It makes my hair feel so much stronger - I’ve been using it consistently but sparingly for about a year now and it’s saved my hair from the bleached mess it wasI’m not sure for title
I didn’t understand the hype infill I tried it my hair used to get so dead so quickly even though I use no heat but this actually worked really well it is abit more expensive but definitely worth itIt works
I've lost count of how many times I've purchased this, it's a staple in my haircare regime. It's helped to keep my fine bleached hair healthy as I've been growing it out and avoiding the scissorsA wonderful product
This mask works so well! For the price, I was quite skeptical and I thought it may be an overhyped item. However, it works wonderfully and has repairs my hair so well. My hair was quite damaged from bleach, though my hair has almost gone back to full health.My go to for an easy treatment
I love this product. I have been using it for years. It cuts my shower time as it's applied after the show and my hair is left lovely and soft.Hair saver!
This product is a must for anyone with damaged hair!Works really well!
I have been using this product for a couple of months now as treatment now and then. It has helped to strengthen my brittle ends and my hair feels a lot more hydrated.Great product
It’s so expensive for such a small amount but if you use it right it can last a fair amount of time. I’ve really seen a difference in my split ends when I use this, I get a full head of highlights every 8 weeks so my hair is always in need of some extra TLC. Will continue to buypricey
I like that it untangle my hair and all but I just can't seem to feel the long term resultsRepairing
Nice product, seems to repair my dead ends, but rarely repurchase due to price.Magic in a bottle
I had heard the hype, and let me tell you K18 lived up to it. After just 1 application my hair instantly felt smoother, stronger and less prone to breakage. I bleach my hair so I was after the repair and moisture benefits and I was not disappointed. On the pricey side but works wonders. And a little goes a long way. The condition of my hair has improved greatly and it’s actually growing, I have K1...Read MoreSmooth and Silky Hair
This has repaired my hair after over processed bleach. I noticed a difference with the first use. You only need a small amount so it really lasts agesIncredible
I love k18 , my hair feels a lot healthier and stronger since I started using k18 , blonde dry curly hair , this product is a blessing , highly recommend.Buying this for life
This product has changed my hair forever, I will be a repeat customer for life. At first when I heard about it I thought the price tag was ridiculous but wow what a difference. I’ve coloured my hair for almost a decade now and it has always been dry with split ends and never grew. I’ve gone from a short bob to shoulder length shiny healthy hair in less than 6 months with k18, I froth itNot a must buy
I bought this after lots of research when I noticed breakage on my dyed hair. Instructions say not to use conditioner after… after my first 6 washes I now condition after using the mask and prefer this to beforeCannot live without
Don't have damaged hair but have frizzy and semi thin hair - this product reduces the frizz and gives my hair volume! absolutely love itGreat... I think
I haven't seen a reduction in damage bit it looks and feels healthier and stronger with useSo far so good
have used this only once, but already notice more of an immediate result than using olaplex.Good
It is good product and I recommendSoft hair x100000
I much prefer k18 over oleplex. Makes hair super soft!Great Stuff
You can definitely see a difference from first use. Hair is more manageable, softer and smoother. Less split ends noticeable.Changed my hair
I've always had brittle and unhealthy hair no matter what I did, but my hairdresser has noticed a healthy change in my hair since using K18. It does have a high price point, but a little goes a long way especially on my fine and short hair and I only need to purchase every six months or so.Love
My hair is bleached and I use a lot of heat on my hair I swear k18 saved my hair no joke best product ever so worth the priceTHE BEST RESCUE HAIR PRODUCT EVER!
I have been using K18 since July last year (just ran out). It has saved my bleach damaged hair!! I cannot live without it. K18 had become a staple in my Haircare routine. Could not recommend this product enough!Good
This is a good and hydrating maskPut off buying for ages
I’ve seen so much hype for this product and could never bring myself to spend so much on something so small, but was always curious, esp as someone who’s been using olaplex for the last year and craving a bit more of a result. I finally decided to bite the bullet and try it. I’ve used k18 3 times so far and I’m so mad that I like it. My hair feels different, softer and healthier. I will say I igno...Read MoreHelps repair
Noticed a huge difference adding this to my routine for bleach damaged hair. Definitely a must for damgeGood
Great hydrating hair maskLove it for coloured hair and post beach time
Recommended to me by my colourist. It used to be hard to purchase outside a salon and I’m so happy this is easy to come across these days. I have balayage hair that ranges from mid-length to above my shoulders, and this product, used every couple of washes, makes it so healthy, shiny, strong. Took a couple of tries to get it right - I use more than the recommended two pea sizes of drops, but if I ...Read MorePretty Good
Nice texture, light and hydrating. Would repurchaseA MUST HAVE FOR BLEACHED HAIR!!
I recently bleached my whole hair blonde and this product has been a life saver. I use it once a week and it makes my hair feel so much softer and healthier that it doesn't look completely damaged from the bleach. Have repurchased multiple times and will keep doing so.Hair saviour
This was recommended by a friend and I am so pleased. Genuinely can see results with hair being stronger, smoother and healthier after even 1 use.K18
I would highly recommend this product, it makes my hair feel so softEssential for blondes
Best product and worth every penny! This has bought my hair back to life after years of bleaching and styling, my hair is so smooth and has removed all the frizz and my hair feels so much healthier!The best
Love this for my fragile curly hair.Amazing
As an ex hairdresser I find this an incredible product. It does everything it says. My hair loves and it lasts forever. A great hack I use it for travel because it saves space so much goes a long way even if you want to decant it to make the jar even smaller. It also saves time in the shower because you shampoo only before applying. Don't use any more than they say it is truly concentrated. I have...Read MoreDid see any changes
I used this product for 10 washers and didn’t see any change or benefit for my hair. You only need a little bit, especially for fine hair like mine. I found it can easily make your hair feel like it has lots of product in it. I personally wouldn’t recommend this product, it has a big hype, However my hair is still having a lot of breakage and this just makes it feel like I need to wash my hair aga...Read MoreInvigorating for dry hair!
Great health boost for dry balayaged hair. I was recommended to use this product by my hairdresser and it’s great! Use once a week instead of conditioner. Would recommend!Works well
I found better results from this than olaplex. After a few uses my hair does feel softer and slightly less damaged... I hope it has the long lasting effects it claims it does as the pricey tag is very high.THE BEST
My favourite hair treatment to date! It’s small but it lasts ages! If you bleach your hair this is a must have product. I apply this to my hair as a treatment weekly and I can feel the difference. Have been using it for 6 months now. My hair has never felt betterObsessed!
Loved this. At first my hair didn’t seem to absorb the product, I added the cleansing shampoo & wow, the difference was immediate! I have very bleached/coarse hair… had. 😂Makes my hair soft
Great mask that leaves my hair silky soft.Will always continue to repurchase!
This made such a difference instantly. Hair is less frizzy, smooth and looks very healthy. I found this works best by using shampoo, small amount of conditioner, small amount of shampoo. Then drying hair halfway before using this treatment.didnt notice anything
ngl i've used this as well as olaplex and i havent noticed either of them doing anything to my hair. i hate that you cant use conditioner when you use them too BUT, the hairdresser never says my hair is damaged so maybe this has helpedNot the hype everyone gives...
I've tried this twice... Twice... I have natural ringlets and very careful with my hair. This stuff dried out my hair. I tried wrapping it at night. Braiding it to lock it in. Usually, N.3 Olaplex or a spray bottle with a little high quality conditioner mixed in the water is my go to and lucky I had both. Gave the second bottle away to a friend that likes it. Didn't work out for meIt worked in minutes
It worked in minutes about five minutes and it makes the hair soft, smooth and healthyWorth the hype
Can't lie, this stuff, as ridiculously priced for the amount you get, is 100% worth it. I've bleached, straightened and curled my hair to death, but this bad boy delivers. I have medium length, thick hair and only require 2 pumps and only treat twice a week, so it has lasted a while. The results are amazing - smooth, soft, light and visibly stronger hair with less breakage.Not what I expected
I am following each step as instructed, but my hair ends up dull dull and heavy. My hair is thin, I usually dye it but it wasn't in such a bad condition it always shone, now after the cream it is dull and heavy.Worth the hype
Definitely worth the money, and a little goes a long way.Amazing
This has literally brought my hair back to life. My hair feels so healthy and smooth since using thisLife changer
I was first introduced to this whilst travelling in Canada. This is so great for my frizzy curly hair and has stopped the need for lengthy “cure” times with other products. Just shampoo and add this as a leave in treatment. Voila!Trust the Process
This product really started to work well about 8 uses and now I LOVE it. Note my hair is not dyed/treated at all so may so a quicker result. Will repurchase.Worth every penny!
My hairs are so dry from coloured/bleached precess. I followed the instructions, rub it on the palm of your hands for it to activate then applied on my damped hairs which were really tangled, soon after I put the mask on I can feel the different. My hairs are softer and easy to comb! Really recommend for everyone who have damaged hairs. After single use my hairs are so tamed, they look shinier aft...Read MoreSecond time repurchasing
I love K18.. Was recommended this product by my hairdresser and have been using it ever since. I find my hair feels stronger and grows quickly when I use this repair mask, highly recommend!Damaged Dry Hair Life-Saver
I was recommended this treatment by my hairdresser after dying my bleached hair brown. It has been an absolute life saver for my dry and damaged hair. Would recommend to anyone that has damaged dry hair.Amazing
Amazing product. Only downside is that it’s a small bottle, and you can’t have any conditioner on before applying which is when my hair is very dryA must have
My hairdresser recommended this as my hair was really dry from all the sun and water in Europe! Honestly can say this product works! My hair felt amazing after the first use!Best on the market
My hair type is dry & damaged, frizz-prone, fine and quite long. I had been using a protein-based masque recommended by my hairdresser for years which worked at first but over time seemed to dry my hair out and cause it to become more brittle. I was then recommended this by a new hairdresser and it has been a total game changer. It does exactly what it says! Only shampooing in shower, then addin...Read MoreGreat Product
My hair is badly fried from colour and heat damage, i have noticed a significant improvement in the feel and look of my hair since using this product.Ok
This definitely makes my hair softer but hasn’t improved frizz. I prefer Olaplex number 9 hair serum. Makes my hair silky smooth!Life changing
Your hair will thank you! Expensive but worth itrockstar product
this has been a huge game changer. I haven't trimmed my blonde hair in months. that's about all the evidence I need. I'm finally growing my hair long after years of trying!Great
Great productYour new best friend.
My hair is now at it longest it have ever been and I'm sure it is this product hardly have any breakage anymore and it grown pass my shoulder first time in 10years.Doesn’t make a difference
Pretty disappointed considering the price point. My hair is still dry and I have seen no improvement from using this mask. Have used it at least 15 times with no improvement.Miracle
Saved my hairMust have
Increases density, hair looks much better.I can't live without it
It kills me because of the price tag, but for my dry, damaged and bleached hair, this is a Godsend! I'm onto my fifth bottle now?Big Difference!
After 6 uses I did notice a considerable difference in the strength and texture of my hair. I appreciate the fact that you don't have to rinse it out like you do with Olaplex. It does smell a bit like alcohol but it does go away after hair is dry. I have fine hair that goes down to my hips and I only needed three pumps for my entire head. Didn't weigh my hair down or leave it with any residue. Gre...Read MoreI think I love it?
I’ve been using K 18 for about 6 months now. I have pretty fried hair from bleaching. When I use this (about once a week now) I do feel like my hair is softer and sits better after blow drying and straightening. I wouldn’t say that I hav3 noticed an overall improvement in my hair quality though just an improvement on the days that I use it until the next time that I wash it. I do find the process ...Read MoreWow
I got a sample of this with my Dyson Airwrap and all I can say is WOW. It took a bit of getting used to, towel drying hair mid shower and not conditioning, rather, just leaving the K18 in but after only a few uses my thin pathetic hair feels thicker and lush! I’m literally adding a full bottle to my cart after this review. Game changer for me. Well worth the price tag!Great
Great mask treats damage from styling and colouringBlonde 's friend
I have very thick hair that has been light blond for 20 years - changed to dark after a bad lot of breakage - then returned to blond . I am a natural level 4 and I'm a blond 9-10. I have used everything on the market. This is a game changer . I have followed instructions to a "t" Making sure it is well rubbed between my hands until it's is a thick white viscous cream to put in my hair. The hair ...Read MoreRepair your hair
I have tinted and ageing hair. There is a noticeable difference in the quality of my hair after using this product. It works best for me when alternating with a hydrating conditioner on the washes that I’m not using this.It works
I have been using this every 2 weeks and I have noticed a huge difference in my hair. I have dry split ends prone to breaking easily, and now I noticed less breakage and overall smoothness. Use sparingly.So expensive but so worth it
This is absolutely worth the price tag and is legitimately saving my hair right now. I'm very grateful this exists!Wow
Absolutely worth the price tag, will be repurchasing!Not for me
Didn’t work for me. can’t tell the difference whether I use it or not and it is expensiveChanged my hair texture
This has absolutely saved my bleached hair. It holds moisture for so much longer now and is less frizzy and coarse. One of the best protein treatments I've usedAmazing
I have used this product every week for years and it's a must have for bleached hair. Lasts ages and does what it says it will.It's ok
I tried this after a friend had incredible results with it. It does smooth my hair, however I really hoped it would be more convenient than Olaplex no 3. Sadly, not the case. I find my hair is so fragile and tangled when I step out of the shower without having used conditioner so it is really difficult to apply to knotty, tangled hair. It doesn't smooth it enough to let me comfortably dry it so I ...Read Morethe best product ive used.
this is incredible, used it twice and the difference is noticeable.game changer
This is so much easier and more convenient for me to use than Olaplex so it gets my vote there. I haven't had a haircut in months because my ends don't need it yet. Definitely worth the price tag.Amazing
Amazing, , works better then Olaplex in my opinion! Leaves my hair healthy and softLove it
Recommend by my hairdresser- I get the in salon treatment & use this in between appointments. I love that it is a leave in product that replaces conditioner. So you just shampoo, then towel dry, comb a tiny drop through. Makes my hair feel thick & easy to style.Nice product
Love the texture of this hair mask, it has slightly improved my dry end condition, but has improved my friziness even more.Hot tip
Make sure you lather in your hands first until a white cast forms this was a game changer for me I love K18Helping to regenerate my hair
After a recent bout of COVID, my hair suffered terribly. It was thinning, felt dry - and was prone to extreme breaking. When I first used this, I repeated over 6 washes and now I alternate between this and a mask or conditioner (after shampooing). It does initially feel conceptually weird not to use a conditioner at all. But I quickly got over that when I saw the results. It truly has helped m...Read MoreLOVE
Okay, I'll admit I'm a few years late to the K18 party, but geez am I glad to have tried this product. It is so good! I still can't believe how soft it leaves my hair despite not using conditioner. Love this product and have recommended it to anyone who will listen :)Makes a real difference
I purchased two sample sizes of this product and used them over four washes. My hair was in noticeably better condition afterwards. After another three washes without the product, I feel like it's time for another treatment - I just wish it wasn't so expensive. One star off for price.Good but likely x2-3 too exy
I have long fine hair, i mostly grew out my blonde throughout covid but I went to a new place and they overprocessed my hair and damaged it, I haven't really put much blonde in since (just my long way of saying I dont have very damaged hair) so I can only speak for having OK hair to start with, it definitely made my ends less fluffy looking, but not a huge improvement. Im not sure if anyone else h...Read MoreEasy to use and works quickly
I have thin and dizzy hair, and been using k18 once a day for 2 weeks. I already noticed my hair become thicker and smoother. I dye my hair regularly, but there is no split ends at all. I normally use 4 pumps each time, starts from end to root. This product definitely worths the money!expensive but worth it
My hair stylist recommended K18 after I had a massive bleach job (asian hair to neon orange). Literally saved it from falling off my head. However, my hair is quite thick so I had to use a lot more than the recommended amount to really spread it in. Have repurchased this a few times and they lasted me for a year. Currently not using this right now because I went back to my natural colour and don...Read MoreDoes what it says
It is such a nice conditioning product that leaves the hair soft and silky. I just tried its travel version but ready to buy full sizeTotally transformed my hair
As someone who has had their hair dyed and bleached many many times. this product has totally transformed my hair. It has left it so soft and shiny and reduced the frizz in my curly hair. Although it is a rather expensive product it is worth every single dollar. I completely understand the hype this treatment mask received as it truly works magically.Worth the money
I tried K18 and my hair feels amazing! It's so healthy, smooth, and soft. The product is a bit pricey, but it's worth it for the results. I highly recommend giving it a try if you're looking to repair and restore damaged hair.
