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K18

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

    • Based on 21,886 reviews
Condition: New
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$29.00 Why this price?

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Availability: Only 10 left in stock, order soon!
Fulfilled by Amazon
Arrives Monday, Feb 24
Order within 5 hours and 9 minutes
Available payment plans shown during checkout

Size: 0.51 Fl Oz (Pack of 1)


Brand: K18


Item Form: Cream


Hair Type: dry, All


Product Benefits: Our K18PEPTIDE™ repairs hair at a molecular level across multiple types of bonds, restoring hair health for all See more


Age Range (Description): Adult


Product Dimensions ‏ : ‎ 3.15 x 1.57 x 1.57 inches; 1 ounces


Item model number ‏ : ‎ K18-31007


UPC ‏ : ‎


Manufacturer ‏ : ‎ K18


Country of Origin ‏ : ‎ USA


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Monday, Feb 24

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

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Top Amazon Reviews

    • Worth the money if you can splurge
Size: 0.51 Fl Oz (Pack of 1)
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. ... show more
Reviewed in the United States on January 25, 2025 by Claire
    • Miracle in a Bottle
Size: 50 ml
Review Image by Brandi brown Brandi brown
I’ve been using the K18 Leave-In Treatment, and it’s a total game-changer for my hair! It works wonders on damaged hair from bleach, color treatments, and heat—my hair feels stronger, softer, and looks so much healthier. What I love is that it doesn’t just cover up damage, but actually restores it from the inside out, giving me that "like-new" texture. Plus, the results last without washing away, so it’s truly a treatment that keeps working over time! ... show more
Reviewed in the United States on January 2, 2025 by Brandi brown Brandi brown
    • Great
Size: 0.51 Fl Oz (Pack of 1)
This stuff is great! Put in hair after towel drying and comb in. Leave in. Not oily. Prevents frizz and fly aways. Conditions hair well. Do wish the price is less! Be careful, read reviews. Some are knock offs. Also check size before ordering.
Reviewed in the United States on December 29, 2024 by Robin
    • Not sure if it’s good for coarse curly hair in transition.
Size: 0.51 Fl Oz (Pack of 1)
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. It’s an ok product but it’s my first time using it. Will continue using it! ... show more
Reviewed in the United States on February 13, 2025 by Anonymous
    • I never thought I could love a leave in!
Size: 0.51 Fl Oz (Pack of 1)
I’ve tried many a leave in conditioner and they always left my hair feeling heavy and sticky. They just weren’t right for my hair type, which is thinning, damaged, and dry. I also live in the very humid state of Florida. I watched a YouTuber who happened to have gorgeous hair, but had nothing to do with the beauty industry. She had gotten a lot of questions on her hair and recommended this. I’m soooo glad I hit buy it now! This is the best conditioner, hair mask, and leave in conditioner I’ve ever used. I’ve been using for about 3 weeks and I only wash about 1-2 times per week. In this 3 weeks, I suddenly have shine, volume, and no longer feel a need to blow out my hair, or curl, or iron it. I simply blow dry my roots about 10 minutes after applying from mid length to ends. Let the rest air dry and holy cow, the difference!! I’ll wrap it up in a soft scrunchie once dry for sleeping and when I wake up, it looks like I had it professionally done! The shedding had been much less since I started using. I don’t know if that’s from this or just a natural cycle and to be fair, I also dyed my hair from copper back to my natural dark brown. But this is now a forever staple in my hair routine. The smell is pleasant and not overbearing. My hair feels stronger, and I’m not finding the tangles I once was. My hair used to be so dry that I couldn’t get a brush through it. ... show more
Reviewed in the United States on October 14, 2024 by Best leggings ever. Smooth material. Does not pick up on fuzz, tucks everything in nice and smooth, and super comfortable!
    • Fall in love with K18 for lots of $ LOL
Size: 50 ml
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! ... show more
Reviewed in the United States on October 7, 2024 by Amazon Customer
    • Jesus Himself Might Have Formulated This
Size: 50 ml
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. ... show more
Reviewed in the United States on February 5, 2025 by Rebekeekee

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