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K18 - Leave-in Molecular Repair Hair Mask

K18 - Leave-in Molecular Repair Hair Mask

4 Minutes to Undo Years of Hair Damage - No Rinse Needed

Clinically proven to reverse damage from bleach, color, heat & chemicals, fast.

  • Stronger, smoother, softer hair in just 4 minutes.
  • For all hair types, including treated and textured.
  • No-Rinse Formula, Just apply, wait, and go
  • No-Rinse Formula, Just apply, wait, and go
$26.99 USD
$26.99 USD
Sale Sold out
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Your Hair Deserves More Than a Temporary Fix

Stop masking the damage. Start reversing it for real!

Most treatments coat the hair to hide the damage. But if your strands feel brittle, fried, or lifeless after coloring, bleaching, or heat styling, you know the struggle runs deeper.

K18 works at the molecular level to repair broken bonds inside the hair so it doesn’t just look healthy… it actually is

Hair Repair Doesn’t Have to Take Hours

No masks, no rinsing, no 12-step rituals.

Let’s be real most “deep treatments” are a full-time job. Apply. Wait. Rinse. Repeat. And the results? Barely noticeable.

K18 simplifies everything with a powerful leave-in formula that works in just 4 minutes, no rinse needed. Real repair without the extra steps.

Years of Damage Disappear

See the K18 difference, smoother, stronger, healthier hair after just one use. Real results. Real repair. No rinse required.

Science You Can Feel

Real repair starts where damage begins deep inside the hair.

Unlike surface treatments that wash away, K18 uses a patented biotech peptide (K18PEPTIDE) that travels into the inner layers of your hair.

It reconnects broken keratin chains, the very structure of your strands to restore strength, smoothness, and bounce from the inside out.

The result? Hair that’s not just better-looking, but actually healthier with every use.

Loved by Pros. Proven by Science. Viral for a Reason.

From A-list stylists to everyday users, K18 has taken the hair world by storm, racking up over 20 billion views on TikTok and earning a permanent spot in pro salons worldwide.

Clinically backed and biotech-developed, it’s more than hype it’s haircare that actually works.

Frequently Asked Questions

how does the k18 mask work?

The K18 mask works as a treatment to reverse damage in 4 minutes. It’s powered by our biomimetic K18PEPTIDE™ to seamlessly fit in and reconnect broken polypeptide chains at the molecular level. As a result, disulfide bonds are also reconnected for reinforced strength along the length + width of hair, offering comprehensive, lasting, and progressive repair.

what is the k18peptide™?

K18PEPTIDE™ is a biotech-developed peptide that mimics hair’s structure to reverse damage by reconnecting polypeptide chains and disulfide bonds broken during damage from bleach + color, chemical services, and heat

why skip conditioner?

Conditioner leaves a film that blocks our peptide from penetrating effectively. Once the 4-minute wait time is up, feel free to use a conditioner, a leave-in, or any type of product.

I noticed there’s alcohol in the formula, isn’t that bad for you?

We like to keep our formulas minimal, only using the exact amount of ingredients needed to get the peptide where it needs to go. Here the alcohol serves as an agent to optimize the hair environment for the K18 mask to work on a deeper level. Our unique blend of 3 alcohols functions to open the hair cuticle so the K18PEPTIDE™ can penetrate the innermost layer of hair, reaching the broken polypeptide chains (keratin chains).

When should i expect to see results?

Most see results after 2-3 uses. The more damaged the hair, the more dramatic the results so it may vary depending on your hair type and level of damage.

Reach Out To Us Below

Customer Reviews

Based on 12 reviews
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M
MJ
Bountiful Body but tangled

For my long hair ... 35 pumps. - Badly damaged dry ends look much much better. FEELS QUITE SOFT - my thick hair even more body - left my hair tangled, hard to brush-comb -hair frizzy despite trying to use flat iron ♡ hope using it several times will improve the frizz. Definitely huge improvement. But needs a 2nd product for frizz, tangles, shine Left pic after k18. Right pic before, with coconut oil after miracle 10 leave in for blondes

C
Camila
I Fell in Love with This Product

I have very thick, coily hair, so I was honestly nervous about not using conditioner to soften it—but I decided to follow the instructions anyway (with a little hesitation, haha). Long story short, I’m amazed by how soft, moisturized, and beautiful this product left my hair. I couldn’t believe how manageable and healthy it felt, even without my usual routine. Absolutely no regrets—worth every single penny!

M
Melissa
No frizz !!

I bought this product because my hair stylist recommended it as it claims to reverse damage from heat, styling, and color. I’ve been coloring my hair every 9 weeks for the past 10+ years and also carry damage from hot tools in the past. I didn’t think much of this product, but I immediately noticed results after I combed my hair after washing. I was nervous about having to brush it out without conditioner, but my wet brush detangled very easily after 4 minutes. I also noticed that when I blow dried my hair, there wasn’t as much frizz as usual. I finished off with curling my hair and wow… definitely a huge difference. I barely have any frizz and my hair looks so shiny and smooth. Definitely worth the price tag.

R
Rahat Pat
I’m in shock.

I’m Indian. I had thick straight hair that has turned thin and curly over the years due to damage, bleach, straighteners, and products. I used this for the first time today and it is insane to me that something actually worked for my hair. I followed the exact directions and it seems as if years of damage just vanished off my hair after the first use. I can assure you my hair is usually puffy and visibly brittle, but not today. I was very concerned when I saw the size of the product (I bought the small one and boy is it tiny for the price), but I can assure you it is 100% worth the price for the quality of it. Just wowed. I didn’t think anything could repair my hair at this point, but I took a chance and if you’re taking a chance too, this is the product to take that chance with. Recommend fully.

B
Brandi brown
Miracle in a Bottle

I’ve been using the K18 Leave-In Treatment, and it’s a total game-changer for my hair! It works wonders on damaged hair from bleach, color treatments, and heat—my hair feels stronger, softer, and looks so much healthier. What I love is that it doesn’t just cover up damage, but actually restores it from the inside out, giving me that "like-new" texture. Plus, the results last without washing away, so it’s truly a treatment that keeps working over time!

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