K18 Leave-In Molecular Hair Mask, Repairs Dry or Damaged Hair, Reverse Hair Damage from Bleach, Color, Chemical Services & Heat

$ 29.00

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Price: $29.00
(as of Mar 04, 2025 09:47:20 UTC – Details)

From the brand

K18K18

k18k18

science backed haircare

Our professional stylist-approved biotech breakthroughs deliver your healthiest hair.

Engineered for all hair types.

sold exclusivelysold exclusively

Your Healthy Hair Routine

k18k18

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 that this conditioner is effective and provides good results for their hair. They say it makes their hair softer, smoother, and shiny. However, some customers feel the price is too high and the bottle size is small for the cost. Opinions differ on its ability to repair, strengthen, and moisturize hair.

AI-generated from the text of customer reviews

12 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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  1. 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 they’re on a budget.The scent wasn’t too overpowering, and it was just right to make my hair smell and feel good.

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  2. Nina

    Incredible! WORTH IT.
    This stuff is so worth the price. Although I can’t afford to buy it all the time, it really really works. I bleach my hair every 3-4 months and I’m the worst at getting my hair cut. You wouldn’t know that it’s color treated and in need of a cut. My hair doesn’t look fried, frizzy, or broken. It truly does what it says and I love it.

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  3. Rebekeekee

    Jesus Himself Might Have Formulated This
    Look, I’ve done unspeakable things to my hair. Bleach? Yep. Box dye at 2 a.m.? Of course. That one time I tried to “go blonde” at home and ended up with the color of an abandoned cornfield in winter? You bet. My hair has been through it, and honestly, I expected this mask to just sit there like my ex—promising things and delivering disappointment.But NO. This? This is HAIR CPR. I slathered it on and within minutes, my ends went from desert straw to moisturized silk. I don’t know what kind of molecular wizardry is in this bottle, but I’m convinced K18 is a front for some underground hair-reviving sorcery.It’s like if your split ends went to therapy, healed their trauma, and came back with a trust fund. Expensive? Yes. Worth it? Also yes. 10/10, will be rationing this like it’s the last bottle on earth.

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  4. nicole

    Savior
    I cannot rave enough about the K18 Hair Mask—it 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. I’ve noticed my hair feeling softer, looking shinier, and overall much healthier. The breakage has dramatically reduced, and the texture has improved—my hair feels stronger and more manageable. It’s 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! It’s well worth the investment, and my hair has never looked or felt better. Highly recommend!

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  5. 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.

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  6. 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 it’s on the pricier side, its effectiveness and quality make it worth every penny. When I’m 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 I’ll 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 you’ll need to buy more sooner—quite disappointing!

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  7. Chacon

    A Former Scene-Queen’s Best Tool
    Like many DIY hair enthusiasts, I did most of my trial and error on my teenage hair during my scene-queen days. As an adult, I’ve taken a bit less risk with my hair but I do still love changing it up with different vivids regularly! (It’s not a phase, mom!) Jokes aside, I’ve done all sorts of processing on my hair in the last year. Level 7 blonde to a full level 10, to lilac, to deep purple, back to level 7/8 blonde, to blue, to copper, now burgundy. I tried K-18 for the first time after accidentally letting my ADHD get the best of me while doing my hair and leaving bleach (with 30 vol… I know… I know..) on for too long. There is no way around the need to cut off dead/fried ends in time, but K-18 made it so I cut off significantly less! In just 2-3 treatments, you almost couldn’t tell anything had happened. The bottom half inch of my hair or so is the only portion that seems more damaged than the rest and K-18 is already working it’s wonders.If you did the absolute most on your hair and need a temporary fix while you wait for growth to allow for more trimming, this is your best bet! Although pricey, a little goes a really long way. On shoulder-blade length hair, I only needed 2-3 pumps. I cut my hair just above my shoulders recently and now I only need 1-2 pumps.Admittedly, I don’t follow the directions to the T. I struggle with not conditioning my hair as I live in a very dry, desert mountain climate and not-conditioning my 2A/2B hair just makes me look wild. Typically, what I do is shampoo as needed and deep condition (weekly), but every time my hair is damp, I use prayer hands to work product through the mid shaft/ends then let it air dry.

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  8. KP

    My hair was very damaged and whole this product is fairly pricey I felt that it really helped repair my damaged hair

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  9. Patricia Márquez Guijosa

    Muy buen producto

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  10. Sam

    BEST PRODUCT EVER. I can’t 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 don’t 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 I’ll use it once a week for about a month to repair my hair. Then I’ll only use it if I’m going out for a nicer occasion or I feel my hair needs a bit of help.I focus it mainly on the ends.I’ve gotten so many compliments on how beautiful my hair is/how soft it is since using this!I love that it’s 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 didn’t 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 couldn’t believe it. 😆Anyways, long story short, buy this product! You won’t 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). Don’t use conditioner.2. Gently towel dry hair after. Brush hair before or after K18 (it’s easier after if you’re 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 you’re 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 you’re done!Hope this helps someone! ☺️

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  11. almaa

    Buen producto, hidrata el cabello. En mi caso, mi pelo no estaba tratado ni muy dañado, por lo que no puedo decir qué tanto funciona en esos casos.

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  12. Ana Rodrigues

    Recupera bem o cabelo. Produto incrível. 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.

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    K18 Leave-In Molecular Hair Mask, Repairs Dry or Damaged Hair, Reverse Hair Damage from Bleach, Color, Chemical Services & Heat
    K18 Leave-In Molecular Hair Mask, Repairs Dry or Damaged Hair, Reverse Hair Damage from Bleach, Color, Chemical Services & Heat

    $ 29.00

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