K18 Leave-In Molecular Hair Mask, Repairs Dry or Damaged Hair, Reverse Hair Damage from Bleach, Color, Chemical Services & Heat
$29.00
Price: $29.00
(as of Mar 14, 2025 13:24:20 UTC – Details)
From the brand
science backed haircare
Our professional stylist-approved biotech breakthroughs deliver your healthiest hair.
Engineered for all hair types.
Your Healthy Hair Routine
reverse hair damage
K18 molecular repair is cilincally proven to reverse damage from bleach, color, and chemical services in 4 minutes.
Who are we?
We’re a biotech-powered brand breaking the rules on haircare. Beloved by the PRO community and at-home users in 100+ countries, 20+ billion Tik Tok views, and 25+ prestigious awards, our growing line up of intentional, science backed haircare is all about unlocking next-level expression for all.
What makes our products unique?
Our K18PEPTIDE-powered innovations were born in the biotech lab to radically simplify your routine and deliver your cleanest, healthiest hair.
Product Dimensions : 3.15 x 1.57 x 1.57 inches; 1 ounces
Item model number : K18-31007
UPC : 858511001289 746559900490 858511001371
Manufacturer : K18
ASIN : B09HR5KSR8
Country of Origin : USA
Customers say
Customers find the conditioner effective and able to improve hair softness and shine. It makes their hair smoother and healthier, making it look and feel great. However, some customers feel it’s expensive and not practical for everyday use. They also dislike the bottle size. Opinions vary on its ability to repair, strengthen, and dry hair.
AI-generated from the text of customer reviews
13 reviews for K18 Leave-In Molecular Hair Mask, Repairs Dry or Damaged Hair, Reverse Hair Damage from Bleach, Color, Chemical Services & Heat
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$29.00
Maria –
Small & pricey but so worth it!
I wasnât expecting it to be this small for the price haha! But it is an amazing product & by far the best leave in conditioner that has actually controlled frizz, and left my hair soft. Iâve bleached my hair several times which has obviously left my ends feeling like a straw, but this immediately left my hair looking healthy and hydrated. It does not leave your hair feeling thick and sticky and it smells great!
Claire –
Worth the money if you can splurge
This hair product worked wonders on my hair, I splurged on this product because I heard wonderful great reviews about it. The price of this product is not ideal and I definitely think there are other products out there that one could use if theyâre on a budget.The scent wasnât too overpowering, and it was just right to make my hair smell and feel good.
kaylon80 –
Stellar product. Works very well. Highly recommended.
I have 4b / 4a type hair. This product is worth every dime.I have used it once so far, and have seen a notable improvement in my hair. No conditioner needed after (just a leave in and a styler). Used alone or together with a good bonding concentrate, this stuff is gold. Very effective, and very highly recommended.
nicole –
Savior
I cannot rave enough about the K18 Hair Maskâit has truly saved my hair! I used to pull my hair every day, causing so much damage and breakage. My hair was dry, brittle, and lacked any real shine or strength. After using this mask for a few weeks, the difference is incredible.The formula is super easy to apply, and a little goes a long way. Iâve noticed my hair feeling softer, looking shinier, and overall much healthier. The breakage has dramatically reduced, and the texture has improvedâmy hair feels stronger and more manageable. Itâs as if the mask has repaired the damage I caused over time.I now look forward to hair care days because I can actually feel and see the difference. If your hair has been through a lot, this mask is a game-changer! Itâs well worth the investment, and my hair has never looked or felt better. Highly recommend!
Kieley Sue –
This stuff is a miracle!
This stuff is an absolute miracle in a bottle. It has fixed my hair after an unfortunate visit to a salon which left my hair extremely bleach damaged hair. Seriously my hair felt synthetic after and looked fried. I noticed a difference after only using the product one time, which is only 4 squirts from the bottle. My hair was so soft, shiny, not a tangled hot mess and just looked healthier.I bit the bullet after seeing this all over social media. Is it spendy? Yes. But I would gladly pay again an again for this vodoo hair repair. Now that my hair is “fixed” I only use K8 once a month and I will never be without.
Amazon Customer –
Fall in love with K18 for lots of $ LOL
I fell in love with the K18 Leave-In Molecular Hair Mask about a year ago after my hairdresser introduced me to it. While itâs on the pricier side, its effectiveness and quality make it worth every penny. When Iâm unable to splurge, I turn to my regular leave-in spray, Perfect 10 Lite.As someone with thin, color-treated hair that tangles easily and suffers from damage, this product has been a game changer. It shortens my shower time, extends the life of my conditioner, makes brushing my hair effortless, and leaves my hair looking healthy once styled.I recently purchased the larger size, fully aware of the cost. However, when I opened my package, I briefly thought I either ordered the smaller size by mistake or received the wrong item. I realized it was indeed the larger size I ordered and I debated returning it.The true test came when I woke up with a legit rat’s nest. I was so thankful I had this product on hand, as it made detangling much easier than previous times when I had nothing to help with the mess.One note: I read a review suggesting that you should rub the product between your palms to activate it before applying it to your hair. That makes sense, and Iâll definitely give it a try. However, I find it quite unethical that the company leaves this step out of the instructions on the box and bottle. It feels like they might not want you to use it correctly so that youâll need to buy more soonerâquite disappointing!
Nina –
Incredible! WORTH IT.
This stuff is so worth the price. Although I canât afford to buy it all the time, it really really works. I bleach my hair every 3-4 months and Iâm the worst at getting my hair cut. You wouldnât know that itâs color treated and in need of a cut. My hair doesnât look fried, frizzy, or broken. It truly does what it says and I love it.
Anonymous –
Not sure if itâs good for coarse curly hair in transition.
I was really skeptical at first because it felt so odd to shampoo and not condition after.. but I followed its directions: I shampooed, towel dried my hair, and put this product in and left in for the 4 minutes.My hair did feel softer, less rough, yes, but I have a lot of coarse curly hair (transitioning from heat damage) I had to use like 7 pumps and this product is expensive. It made like 80% of my hair feel soft and the rest of it i had to use another leave in conditioner to take out the tangles my hair has. Itâs an ok product but itâs my first time using it. Will continue using it!
KP –
My hair was very damaged and whole this product is fairly pricey I felt that it really helped repair my damaged hair
Patricia Márquez Guijosa –
Muy buen producto
Sam –
BEST PRODUCT EVER. I canât remember how I found K18 but honestly I will never go back to anything else. I have very long hair & was looking for something to help with the texture/smoothness after I got highlights. I had another mask before this that was good but this was like a little miracle worker.I donât use it every wash because it is a bit pricey and I have a LOT of hair to cover lol. But right after getting highlights Iâll use it once a week for about a month to repair my hair. Then Iâll only use it if Iâm going out for a nicer occasion or I feel my hair needs a bit of help.I focus it mainly on the ends.Iâve gotten so many compliments on how beautiful my hair is/how soft it is since using this!I love that itâs so easy, no rinsing it out or anything.I do wish it came in even a larger size (I know they have this travel size and the slightly bigger one) but I would love an even bigger bottle!Also side note, I didnât have my hair cut in 3 years and used this during the later months of that time period, and when I finally went to have it cut, my hair dresser was shocked by how healthy my hair was for it being 3 years. She went around telling everyone she couldnât believe it. ðAnyways, long story short, buy this product! You wonât regret it!!My Exact Routine for Soft Shiny Hair:1. Wash hair well with shampoo (I use the Aussie brand) (I often wash twice with shampoo because I wash my hair fewer times a week, scrub really well). Donât use conditioner.2. Gently towel dry hair after. Brush hair before or after K18 (itâs easier after if youâre lazy sometimes like me, lol) Use K18 as directed.3. After k18 has had time to sit on your hair, you can put on a leave in conditioner. I use the Marc Anthony Coconut & Shea.4. Blow dry hair. (My hair is naturally quite straight when blow dried so feel free to straighten or curl yours after this step if needed).5. Take a small amount of Renewing+ Argon Oil of Morocco and run it through the ends of your hair mainly. Then use any small excess amount to run through your hair over any strays. Brush through your hair after to evenly disperse it.5. Finish with a spray of AG Hair Care Argon Shine & Flat Oil Spray. This stuff makes your hair shine! Even if youâre going for a curly look, a little spritz of this just adds a nice sheen to your hair, making it look healthier and more alive. (A friend of mine actually borrowed this once because her hair was a bit frizzy and later asked me what it was because she loved it so much).Comb it through your hair and youâre done!Hope this helps someone! âºï¸
Bree Lopez –
No sé que tanto les sirva mi review, pero aquà va.Tipo de cabello: delgado, grasoso, longitud media- larga, virgen pero un poco reseco de las puntas y sin brillo.Como puedes ver arriba, mi cabello no estaba en una condición crÃtica. Sólo estaba buscando que se viera más brilloso y saludable asà como tener una rutina de cabello.Después de ver muchos reviews en YouTube, lo compré con descuento.Yo no sabÃa que necesitaba esto, hasta que lo compré. Me dejó el cabello muy suave, manejable, sin frizz y brilloso. No es lo único que uso ya que, como dije, me hice una rutina de cabello y me ha dado los resultados que estaba buscando, pero definitivamente esta fue la piedra angular de todo esto.No sé te olvide usar un shampoo clarificante antes, exprimirte muy bien el cabello, frotar el producto hasta que se vuelva blanco y luego ponerte el tratamiento. Yo probé tanto ponérmelo mientras me baño, como después y la verdad me gusta más mientras y después de esperarme unos 5 minutos, ponerme acondicionador.Recomendado 100%
Ana Rodrigues –
Recupera bem o cabelo. Produto incrÃvel. A entrega atrasou por culpa dos correios já que o vendedor postou o produto rápido. Produto veio bem embalado, lacrado e com manual de instruções. O tamanho é bom, vai render bastante. Essa é a segunda vez que compro o k18 e a primeira desse vendedor e gostei mais desse porque veio lacrado e com manual de instruções.