K18 Leave-In Molecular Repair Hair Mask, Patented, Lasting Repair For Dry, Frizzy, Damaged Hair, Reverse Damage In 4 Minutes From Bleach, Color, Chemical Services + Heat
Condition: New
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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
Sunday, May 24
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Size: 0.51 Fl Oz (Pack of 1)
Features
- An At-home Leave-In Treatment infused with the patented K18Peptide that renews hair to its most youthful, healthy state. Benefits: Works to repair even the most extreme damage caused by bleach and color, chemical services, and heat.
- Creates Like Hair Like New: Traveling into the inner-most layers of hair to reach the core polypeptide chains our revolutionary K18Peptide is just the right size and makeup to reconnect broken chains responsible for hair strength and elasticity.
- Renews All Hair Types: K18 doesnt just hide damage or patch it up leaving hair brittle, it transforms even the most extreme damage into hair that looks and feels like new. K18 works on all hair types, all generations, all types of expression.
- Lasting Results That Won't Wash Away: The K18Peptide mimics the natural building blocks of hair and therefore is recognized as naturalso its able to integrate itself with the keratin chains to rebuild and restore hair immediately and over time.
- Back By Biotech: K18 is the worlds first patented biotech treatment that renews chemically damaged hair from the inside out in just 4 minutes, strength, softness, smoothness, and bounce are restored for hair that looks and feels like new.
Product Dimensions : 1.37 x 1.37 x 3.18 inches; 1 ounces
Item model number : K18-31007
UPC :
Manufacturer : K18
Best Sellers Rank: #131 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 (29,385)
Item Form: Cream
Hair Type: All
Product Benefits: "Real, lasting repair powered by K18PEPTIDE™ Hair like new in 4 minutes* Soft, strong, bouncy hair for everyone "
Scent Name: Fresh
Package Type Name: Jar
Hair Conditioner Type: Hair Conditioning Mask
Number of Items: 1
Item Dimensions: 1.37 x 1.37 x 3.18 inches
Liquid Volume: 15 Cubic Meters
Item Weight: 1 Ounces
Size: 0.51 Fl Oz (Pack of 1)
Brand Name: K18
Age Range Description: Adult
Manufacturer: K18
UPC: 858511001289 746559900490 858511001371
Global Trade Identification Number: 89
Model Number: K18-31007
Manufacturer Part Number: K18-31007
Material Features: Cruelty Free
Recommended Uses For Product: Shampoo, skip conditioner. Towel-dry thoroughly. Apply 1-3 pumps from ends to roots (3-9 pumps for 15ml sized mask). Less is more. Wait 4 minutes, do not rinse.
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Sunday, May 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.
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 a lot of leave-in hair products over the years, and this one honestly surprised me. I started noticing a real difference the second time I used it. My hair felt noticeably softer, smoother, and much easier to manage. It also helped reduce frizz and made my hair look healthier and more hydrated. I’ll admit I was hesitant to buy it at first because it’s a little pricey. I’ve purchased many products with amazing reviews before and ended up being disappointed when they didn’t work for my hair. But this product actually lives up to the hype. Another thing I like is that you don’t need to use a lot. A small amount goes a long way, so the bottle lasts longer than you might think. Because of that, I would recommend buying the 50 ml size since it’s usually a better value and can save you money in the long run. Overall, I’m really happy with this purchase. After using it several times, I can confidently say it deserves the positive reviews it gets. If you’re looking for a leave-in product that helps with softness, manageability, and frizz, this one is definitely worth trying.
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Reviewed in the United States on March 10, 2026 by A lady who loves Amazon
Size: 0.51 Fl Oz (Pack of 1)
For color or damaged hair this product work very well. Makes hair easy to comb through. Leave hair smooth and no frizz. Helps with damaged hair from coloring and drying. Convenient, start with bottom of hair ( ends ) up to the top and then no rinsing leave in the hair. . Great product . Brenda
Reviewed in the United States on May 13, 2026 by Brenda L.
Size: 50 ml
Ok I was a bit disappointed in the size when I saw it, especially for how much I paid. But wow, it works. I wish I took a before pic, but seriously every other strand was breaking and split. It looked fried. I was scared to even touch my hair. After one use I could feel and see a difference. I’ve used it twice now, and my hair feels actually healthy. It’s so soft. I have to actively search to try and find a split end. I couldn’t believe it. Before I had trouble finding a strand that wasn’t damaged or split. Now I used 3 pumps at first cuz I thought since I have a lot of hair and it was really damaged in the front, but that made it kind of stiff at first. So don’t use too much or spread it around as much as you can. A little goes a long way. So, now after I’ve seen the results- yeah I can see why this is so expensive.
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Reviewed in the United States on March 18, 2026 by Rachel McNamara
Size: 50 ml
This is by far the best total conditioner I have ever tried. It leaves my hair feeling moisturized, smooth, and easy to style. It helps repair split ends and hair that has been color treated for years. It very pricey, but worth it.
Reviewed in the United States on April 26, 2026 by Sherry Donnino
Size: 0.51 Fl Oz (Pack of 1)
I received this product and was very surprised by how small it is for the price I paid. I have only used it 2 times at this point, but it definitely feels like it is helping my hair. I put this leave-in conditioner on the ends of my hair, and you should wait a few minutes before putting any other products on. I feel like my hair has more bounce and does not look limp and flat anymore. I am excited to see how it works after using it a few more times. It is not greasy, and I didn't notice any significant smell.
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Reviewed in the United States on April 21, 2026 by Nikki
Size: 0.51 Fl Oz (Pack of 1)
I’m over 55 and have spent decades trying everything — from $9 to $144 per product — hoping for softer, healthier hair. I have 3a curls hidden under years of color, heat damage, and dryness. My hair would break and frizz so badly it looked like I had layers (I don’t). K18 is the first and only product that actually delivered on its promise to repair — not just coat — my hair. I was fully prepared to return this if it did not make a difference. It did. This isn’t a conditioner or mask. K18 uses a patented technology that works from the inside out. I used a clarifying shampoo, applied 6 pumps (very small pumps from the "try it" bottle!), finger-raked it through damp hair, waited 4 minutes, and then combed through. No rinsing, no other products. I let my hair air-dry, and it already felt softer and smoother with significantly less frizz. No fragrance -makes me happy. Important note: You do not need to rub this aggressively between your palms to "activate" it — that’s a common myth. Just rub your palms lightly so you can apply it evenly and let the science do the work. It works on the keratin molecules to repair your hair from the inside out. Friction is not going to make the molecules smaller. Don't know why people start these rumors. The next morning, I used my straightener on medium heat and was stunned. Instead of the usual dry straw, my hair was sleek, shiny, and bouncy. Even the ends curled beautifully — something I’ve never seen on my hair before. After four treatments, my hair now feels different, although the greatest results came after the very first use. My hair is softer, smoother, more manageable, with less frizz and more shine. Even in Florida’s 90°+ heat and humidity, it holds up — and I’m not using anything else but K18. A friend even asked to try it after seeing my results. It’s expensive, but absolutely worth it. I’ve already bought the larger bottle. I’m sticking with K18 — this changed everything for me. And to address the expense, the 50mL pump provides 50 pumps. That's 25 applications for me. My average thickness, long hair uses 2 full regular pumps. After the first 4 applications, you move to every 4 washes. That means after the first four treatments, I have 21 treatments more still in the pump bottle. For me, with super dry hair, that means it will last another 18-21 weeks since I only wash once a week, and an occasional "extra". I am going to guess I have taken at least $100 of products that did not work for me to the women's shelter over that time, meaning the waste was as much as this effective product that takes no time to use, packs easily in a suitcase, doesn't stink and IT WORKS! If you have super straight, silky hair, like Asian hair, or other non-porous hair, I do not think you are going to get the same results. You probably already have the kind of hair those of us with porous, damaged hair are looking for. Ask ChatGPT
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Reviewed in the United States on June 25, 2025 by GG
Size: 0.51 Fl Oz (Pack of 1)
Truly is an amazing product to use on your hair. My hair is soft and silky after use. Small bottle and expensive, but a little goes a long way. I have very long hair, and it worked beautifully on my hair
Reviewed in the United States on May 14, 2026 by aususa
Size: 50 ml
I heard reviews about this on tiktok. Decided to try the smaller version first but ended up buying the larger version as well due to it working so well. Took off one star due to the price. Makes hair soft and smooth.
Reviewed in the United States on March 20, 2026 by JC