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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Extended holiday returns
Returnable until Jan 31, 2026 Learn more
Returnable until Jan 31, 2026 Learn more
This item's return window has been extended for the holiday season: Returnable until Jan 31, 2026
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, Nov 9
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Size: 50 ml
Brand: K18
Item Form: Cream
Material Feature: Natural
Hair Type: Damaged
Product Benefits: Our K18PEPTIDE™ repairs hair at a molecular level across multiple types of bonds, restoring hair health for all See more
Product Dimensions : 1.87 x 1.87 x 4 inches; 3.2 ounces
Item model number : K18-31005
UPC :
Manufacturer : K18
Best Sellers Rank: #192 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 25,812 ratings
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Sunday, Nov 9
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
Because of the insane price, I put off buying the full size until I had used the trial size and knew it was worth my money. It is!! I did the 6 consecutive treatments, followed by one approximately every 4-6 weeks, and the health of my hair has improved dramatically. I had some troubleshooting errors originally, as having thick, long, curly hair makes it almost impossible to not use a conditioner. However, after about 4 uses and a lot of research, I started to wait the 4 minutes and follow up with a conditioner, and that’s when I felt my hair start to feel amazing. The damage is reduced, there is significantly less breakage and shedding, and I am looking to buy the jumbo size once this is finished. It is now a staple in my routine despite the cost simply because of the effectiveness.
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Reviewed in the United States on October 13, 2025 by Jaime
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: 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: 0.51 Fl Oz (Pack of 1)
This product is amazing. My hair is recovering from processing and this is already turning things around after two uses. The only reason it's not 5 stars is the cost. I'm not a cheap person but $30 for a MINI?! Forget it. There's an almost dupe by Rida Hair Research Institute. It's just a little different but I'm seeing the same results after giving my hair a break from K18 so as to not skew the results (i.e. I didn't want H2R by Rida Hair Research Institute's results to be confused with residual from K18). Like I said, it's not exact - K18 is still an amazing product. But A more effective with similar results for me is H2R by RHRI - 150ml for $20 vs. K18 15ml $29. In this economy, I'm not the demographic for this product. The brand's bundles are a nice idea but again, the high cost and dismal size of the product received do not match up. I was well aware of the volume when I purchased it and I took the risk of the purchase to try it at least once. I do recommend at least trying once.
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Reviewed in the United States on February 12, 2025 by StephNel