K18 Leave-In Molecular Hair Mask, Repairs Dry or Damaged Hair, Reverse Hair Damage from Bleach, Color, Chemical Services & Heat
Condition: New
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FREE 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
Thursday, Oct 2
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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 : 1.37 x 1.37 x 3.18 inches; 1 ounces
Item model number : K18-31007
UPC :
Manufacturer : K18
Best Sellers Rank: #162 in Beauty & Personal Care (See Top 100 in Beauty & Personal Care) #1 in Hair Treatment Masks
#1 in Hair Treatment Masks:
Customer Reviews: 4.3 4.3 out of 5 stars 25,316 ratings
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Thursday, Oct 2
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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Similar Products
Top Amazon Reviews
Size: 50 ml
I’ve tried countless hair masks, but nothing has worked as well as K18. After just a few uses, I noticed a huge improvement in my hair’s health and overall appearance—it looks shinier, smoother, and feels like it’s finally bouncing back from years of bleach and heat damage. The softness it brings is incredible—my hair feels silky without being weighed down. It’s truly effective; even the most stubborn dry, brittle ends look and feel rejuvenated. I was also pleasantly surprised by the scent—it’s light, clean, and not overpowering at all. Yes, it’s a bit of a splurge, but considering how well it works, I’d say the value for money is absolutely worth it. A little goes a long way, so the bottle lasts longer than expected. If your hair needs serious repair and you’re ready for salon-quality results at home, this product is a must-have.
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Reviewed in the United States on August 18, 2025 by Carolyn C.
Size: 50 ml
I have very dark hair naturally and I decided to go light blonde, close to platinum, so I can color over it with a lighter ash blonde. I bleached my hair twice, did a toner treatment, and then bleached it again a week later and toned it again and colored it. It was rough on my hair for sure. This serum is amazing! I used it as instructed for two days in a row (so far, I will use it 4 more times in a row as instructed) and my hair is soft and already feels stronger and looks healthier. It seemed expensive at first for the amount of product but it was well worth it! It doesn’t take much, I used 3 pumps total and worked it though my hair and my hair was smooth and super moisturized. The ingredients are cruelty free too which is a win for me! I highly recommend this product for bleached or color treated hair that is frail, dry, over processed, and otherwise chemically damaged.
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Reviewed in the United States on September 5, 2025 by Leah State
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: 50 ml
Not using conditioner when my hair is so damaged seemed crazy! I usually put quite a bit of conditioner on my hair to be able to comb through it. I bought the bigger size and it’s REALLY small for the price. I saved a little money by choosing “subscribe and save” $67.50 instead of $75. I used the shampoo, 3 pumps of this & 4 drops of the oil. Surprisingly with only 3 pumps I was able to get my brush through easily! It didn’t look like enough. Nor did my hair instantly feel smooth when applying. So definitely wait the 4 minutes before combing it through. My hair is fairly thick, about 1/2 way down my back and I recently bleached it from my natural brown to blond. I bought the shampoo/ conditioner & oil. My hair is so damaged after bleaching it. :( I’ve tried several recommendations to get it healthy again. Mondo & others haven’t worked. So I was up to try this! It felt softer after using it for the first time! There isn’t much scent and my hair isn’t greasy. I’ll use it 4-6 more times and hopefully my hair will look much healthier as promised. I live where it’s fairly humid. If this works well for that, it'll be worth it! Update 9/8/25: It’s really great!!! this brand has saved my hair! I especially love using this “conditioner” after rising my hair from swimming at the waterpark. I don’t use this every time I wash my hair bc it’s just too expensive for my long hair. But I bought the regular conditioner and I finally have healthier looking hair again after frying it, by coloring it blonde (with bleach) a few times.
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Reviewed in the United States on May 5, 2025 by Wifey and Mom of 4 boys Wifey and Mom of 4 boys
Size: 50 ml
This K18 mask is worth every bit of the hype. I’ve tried so many treatments for dry, color-treated hair, but nothing has worked quite like this. After just a couple uses, my hair felt noticeably stronger, smoother, and less brittle — like it actually repaired the damage, not just covered it up. I love that it’s leave-in and super lightweight — no greasy or heavy feeling at all. I use it after washing, skip the conditioner, and it absorbs quickly without leaving any residue. If you’re dealing with damage from coloring, heat, or just need to bring your hair back to life — this is the real deal. Total game changer!
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Reviewed in the United States on September 2, 2025 by Mariela Herrera | Mom & Professional Organizer