K18 Leave-In Molecular Hair Mask, Repairs Dry or Damaged Hair, Reverse Hair Damage from Bleach, Color, Chemical Services & Heat
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30-day refund/replacement
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
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Availability:
Only 10 left in stock, order soon!
Arrives
Wednesday, Jun 25
Size: 0.51 Fl Oz (Pack of 1)
Brand: K18
Item Form: Cream
Material Feature: Cruelty Free
Hair Type: All
Product Benefits: Our K18PEPTIDE™ repairs hair at a molecular level across multiple types of bonds, restoring hair health for all See more
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:
Wednesday, Jun 25
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.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Size: 50 ml
This stuff has changed the texture of my hair and I love it so much! I struggled with my hair being dry and feeling so yucky all the time… it was hard to brush and keep maintained and I’ve always had great, easy, luscious hair so this was a shock to me when my hair started changing.. this product has brought my hair back to life and has given me so much shine! It’s reduced the oiliness I was struggling with but even when the ends of my hair was so dry! The scent is pretty nice I wouldn’t say it has any crazy smells to it but just a clean smell. This stuff is so effective I highly recommend it to anyone looking to improve their hair health. It is a bit pricy for the size but well worth it. I started off with the small version to give it a try but now I’m onto my 2nd bottle in 5 months and I got the bigger size this time. The small size lasted me 4-5 months though - you only have to use this every so often after going through with the manufacturer recommendations for the first 4 weeks. Overall, the bigger bottle is well worth the price and will last you a long time!
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Reviewed in the United States on June 19, 2025 by Corinne Gordon
Size: 0.51 Fl Oz (Pack of 1)
I don't usually review these kinds of products, because I never see the “miracle results” they rave about. My hair is bleached, damaged and fried at the ends and I was hoping to find something to save at least a few inches of it, so that I wouldn’t have to chop a ton of it off. I swore by the gold standard of Olaplex no. 3 and used it every week for hours at a time, even sleeping with it in, but it only had modest results. This product seemed way overpriced and the instructions too good to be true…just leave it on for four minutes and that’s somehow enough time to work? No conditioner after? But I finally bought the small bottle and tried it. It is TINY and I have long hair and can maybe get two uses out of the bottle, but it did WAY more for my hair than Olaplex! In fact, I got better results from this tiny little bottle than I did from several months of 30$ Olaplex bottles, so this saved me money. Last night I showered, blotted my hair dry thoroughly with a towel, then combed the product through and waited, before applying a spray leave-in conditioner just in case. I blow-dried it with protectant gel in and styled it as usual. It looked much better immediately after. Today I woke up and my ends are AMAZING. They’re not virgin hair by any means, but they finally look much softer and healthier, not bleach-damaged! All my hair feels much softer and looks shinier. Frankly I’m stunned this actually worked so well, and immediately came back to buy the bigger bottle. If continuing to use it produces even more results, my hair will go from bleachy damaged mess, to soft and amazing, and I couldn’t be happier. It’s expensive as heck, but WORTH IT. If you have damaged, bleached hair, buy this.
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Reviewed in the United States on May 28, 2025 by Sarah Frost
Size: 50 ml
LITERALLY SAVED MY HAIR IN ONE USE – MIRACLE IN A BOTTLE I don’t usually leave reviews, but I would actually fight someone over this product if it ever got discontinued. Like. That’s how serious I am. I bleached the living life out of my hair recently—think straw, think crunchy ramen noodle ends, think “oops I fried it but I still want it to look good.” I used K18 once, and I swear to god my hair looked like I had never damaged it at all. ONE USE. Not three. Not six. One. This isn’t your average deep conditioner or protein mask. This is full-on biotech magic. The science behind it is real—this isn’t marketing fluff. It uses a patented peptide (K18Peptide™) that literally reconnects broken polypeptide chains in your hair. Like, it doesn’t just make your hair feel soft temporarily. It rebuilds it. We’re talking actual molecular repair. You feel the difference IMMEDIATELY. And even better? The results just get better the more you use it. No rinsing, no long routines. You just shampoo, skip conditioner, towel-dry, use 1–3 pumps depending on your hair length, and then wait 4 minutes. THAT’S IT. It absorbs fast, isn’t heavy, doesn’t make your roots oily, and doesn’t coat your hair in a waxy film like other products. My hair went from stringy and dead to soft, bouncy, shiny, and fully alive again. Also? A little goes a long way. It’s expensive, yeah, but it lasts forever and genuinely does what it says. I’d rather spend money once on something that works than keep buying cheap products that do nothing but mask the damage. TL;DR – If your hair is damaged from bleach, color, heat, or just life, BUY THIS. It’s not hype. It’s not overrated. It’s the best hair product on the planet and deserves to be in every single “best of” list forever. I’ve tried Olaplex, I’ve tried everything—nothing touches this. K18 is THAT GIRL.
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Reviewed in the United States on May 27, 2025 by Christopher E Christopher E
Size: 0.51 Fl Oz (Pack of 1)
Wow… this is a game changer. My hair was fried bad from blonde and reds over and over. This was my last resort before chopping it all off. After following the instructions, in one use, my hair looks and feels so much better. Usually when I flat iron, there’s tons of breakage on my counter afterwards. Not with this! I’m so shocked, I never write reviews but I had to on this. The price sucks which is why I gave it a 4, but the results are incredible so it’s worth it. I got the small bottle but a little goes a long way. Great great product!!!
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Reviewed in the United States on June 18, 2025 by emily
Size: 0.51 Fl Oz (Pack of 1)
GAME CHANGER I have 3C and 4C Curly hair. Lucky me LOL. My hair tangles easily. My hair likes to break. Let me be clear. When I find a product that works it is difficult for me to try something new. I use Dove Anti Breakage shampoo. I use the TGIN Hair Mask as a styling product. The product works on my hair. BUT K18 hair mask - my hair is no longer breaking. My hair is for the first time in 30 years healthy, strong and pass my shoulders. Yes I trim my ends. Sometimes. Yes it is a little expensive but I don't purchase hair products I don't need. I take my lunch to work. I use that money to invest in this product. Yes, I have to be intentional but my hair is thick, strong. And I love it. Lastly, this is not a paid review nor did I receive free product.
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Reviewed in the United States on June 15, 2025 by SC579