

🧪 Unlock your hair’s DNA: Repair, Renew, Radiate!
K18 Leave-In Molecular Hair Mask is a patented biotech treatment that repairs extreme hair damage from bleach, color, chemical services, and heat in just 4 minutes. Its unique K18Peptide penetrates the hair’s inner layers to reconnect broken keratin chains, restoring strength, softness, and elasticity for all hair types. This cruelty-free, no-rinse formula delivers lasting results that integrate with your hair’s natural structure, making it the go-to solution for professionals seeking salon-grade repair at home.





















| ASIN | B09HR5KSR8 |
| Best Sellers Rank | #144 in Beauty & Personal Care ( See Top 100 in Beauty & Personal Care ) #1 in Hair Treatment Masks |
| Customer Reviews | 4.3 4.3 out of 5 stars (27,400) |
| Item model number | K18-31007 |
| Manufacturer | K18 |
| Product Dimensions | 1.37 x 1.37 x 3.18 inches; 1 ounces |
| UPC | 858511001289 746559900490 858511001371 |
G**G
OMG! OMG ! OMG! K-18 FULFILLS ITS CLAIMS Read on!
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
K**R
This Product is Worth The Cost
This product is pricey but the results are worth it. I have continued to repurchase this product as nothing else makes my hair stronger and healthier looking than when I use K19. Stop wasting your money on less priced items that don’t work like K19.
J**S
Best hair product ever hands down
My hair was looking pretty crappy. I remembered I ran out of this product. Got it again and within 2 uses my hair is back looking decent. I have incredibly fine hair and this does not weight it down, indeed it actually gives my hair body and makes it soft. It is easy to use. I think everyone should try it. Smells good too. Honestly, every k18 product I have tried it next level amazing.
C**E
Fixed My Bleached Hair in One Use – Actual Hair Resurrection
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.
R**E
works great but little product
This hair mask works really well and left my hair feeling noticeably softer, smoother, and more hydrated after just one use. It helped tame frizz and made my hair look healthier overall, so the quality is definitely there. My only complaint is the amount of product for the price — the container is smaller than expected and it goes pretty quickly, especially if you have longer or thicker hair. That said, it does deliver great results, so I just wish you got a bit more for what you pay.
J**R
Not worth the money
This product is just ok for me. I don’t notice it doing a whole lot for me. I stopped using all other hair products besides a heat protectant so I could truly get a feel for this product. My hair doesn’t feel smooth and soft like it claims. It’s still easily knotted and my hair doesn’t look any different. I went back to using my hair oil that is a leave in conditioner, makes it shine and a heat protectant and it’s $13. My hair with that feels amazing. For the price I really thought it would be a magical product and maybe I set my expectations too high. It does not weigh my hair down or make it greasy so that’s a win but that’s about all I like about it.
R**N
Second purchase now, and is impressive when using and left in hair as recommended. Styles well, and leaves hair soft and silky as opposed dry and bushy. However, the next day you would never know, so undecided if would purchase again a third time.
S**A
I**O
fortalece bastante. com certeza vou comprar de novo.
C**A
Would absolutely recommend to improve hair
Y**H
I can say that this product was good but i think the product was too small for the price.
Trustpilot
1 week ago
3 days ago