K18 Biomimetic Hairscience

Leave-In Molecular Repair Hair Mask

4.2 · 5264 reviews
7,965 ₽

What it is: A leave-in treatment mask for all hair types that clinically reverses damage in four minutes. The patented peptide technology works to repair damage from bleach, color, chemical services, and heat, restoring strength, softness, smoothness, and bounce to hair.Hair Type: Fine, Medium, and ThickHair Texture: Straight, Wavy, Curly, and CoilyHair Concerns:- Damage/Split Ends/Breakage- Color Safe- Straightening/SmoothingKey Benefits: - Restores strength, softness, smoothness, and bounce- Repairs damaged hair- Easy leave-in formula delivers lasting resultsHighlighted Ingredients:- K18Peptide™: Repairs damage from bleach, color, chemical services, and heat.Ingredient Callouts: This product is vegan, cruelty-free, and comes in recyclable packaging.What Else You Need to Know: This mask is powered by the patented K18Peptide, which is just the right size and molecular structure to reach the innermost layers of hair and re-connect broken keratin chains responsible for hair's strength and elasticity.Fragrance Description: K18's Signature Scent: The light floral scent features notes of jasmine and peony.K18 x Future Society Scent: Floating Forest fragrance has cool, aquatic, floral notes—rooted in an extinct rainforest tree once found only in Borneo.Top notes: Cooling Bergamot + Black PepperMid notes: Dewy Freesia, Water Lily + Rose AbsoluteBase notes: Salted Musk, Wet Stones + PapyrusClinical Results: In a clinical study on hair that was bleached 8 times, after 2 uses:- Biotech-powered K18Peptide restored damaged hair by up to 82%This product is an Allure Best of Beauty award winner.Clean at Sephora is our commitment to offering effective products without certain ingredients, such as parabens, sulfates, phthalates, and mineral oils. Learn more here.

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Within 30 days of delivery

What it is: A leave-in treatment mask for all hair types that clinically reverses damage in four minutes. The patented peptide technology works to repair damage from bleach, color, chemical services, and heat, restoring strength, softness, smoothness, and bounce to hair.Hair Type: Fine, Medium, and ThickHair Texture: Straight, Wavy, Curly, and CoilyHair Concerns:- Damage/Split Ends/Breakage- Color Safe- Straightening/SmoothingKey Benefits: - Restores strength, softness, smoothness, and bounce- Repairs damaged hair- Easy leave-in formula delivers lasting resultsHighlighted Ingredients:- K18Peptide™: Repairs damage from bleach, color, chemical services, and heat.Ingredient Callouts: This product is vegan, cruelty-free, and comes in recyclable packaging.What Else You Need to Know: This mask is powered by the patented K18Peptide, which is just the right size and molecular structure to reach the innermost layers of hair and re-connect broken keratin chains responsible for hair's strength and elasticity.Fragrance Description: K18's Signature Scent: The light floral scent features notes of jasmine and peony.K18 x Future Society Scent: Floating Forest fragrance has cool, aquatic, floral notes—rooted in an extinct rainforest tree once found only in Borneo.Top notes: Cooling Bergamot + Black PepperMid notes: Dewy Freesia, Water Lily + Rose AbsoluteBase notes: Salted Musk, Wet Stones + PapyrusClinical Results: In a clinical study on hair that was bleached 8 times, after 2 uses:- Biotech-powered K18Peptide restored damaged hair by up to 82%This product is an Allure Best of Beauty award winner.Clean at Sephora is our commitment to offering effective products without certain ingredients, such as parabens, sulfates, phthalates, and mineral oils. Learn more here.

Customer reviews

2.0
verified purchase
Had to return

Unfortunately, this did not work for me. I have very frizzy hair and had high expectations after reading so many positive reviews. I gave it a fair try, but sadly, my hair ended up looking even more frizzy, with lots of flyaways, and overall just looked worse.

10/6/2026
3.0
verified purchase
Not the best on the market

Between this and the pureology dream healer serum, the pureology does a lot more in my opinion; and it’s not only a hair repairing serum it also is a heat protectant, vegan and cruelty free. I get the hype behind this product, it has great marketing but it’s over priced for what it actually is. If you’re trying to grow your hair back after significant damage I recommend looking into hair oiling (castor oil) weekly and honestly the pureology hair serum instead.

10/6/2026
5.0
verified purchase
Saved my damaged bleached hair!!

I swear by this product. My hair was over processed after going blonde and this product helped to repair the damage. I noticed less breakage and my hair looks shinier. It’s pricey but it’s so worth it. I’ve tried so many different products and this is the only product I will continue to repurchase.

10/4/2026
2.0
verified purchase
Did Nothing!

I want to love this, I have purchased this product 3 or 4 times HOPING for some magic, but it literally does nothing for my fine, highlighted hair- no difference. Even after a healthy trim I had, my hair looks and feels the same. Dull. I don’t think I will try it again as there are much better products out there and the price of this is not worth it for me!

10/2/2026
5.0
verified purchase
Yass

I really like this leave in mask. Leaves my hair feeling soft and tames the frizz

10/1/2026
5.0
verified purchase

I’ve been using this for over two years and I’m on my third bottle. My brother who is a hairstylist recommended it to me. It has made a huge difference in my hair. My hair looks much more healthier and I’m barely losing hair in the shower. I used to lose a lot of hair in the shower.

9/30/2026
5.0
verified purchase
Miracle mask!

This product worked a miracle on my hair! My ends were extremely burned, damaged, and frizzy, but after using this product, my hair feels so much healthier, smoother, and silkier. I’m honestly amazed at the difference!

9/14/2026
5.0
verified purchase

there is nothing like it for damaged hair. makes my hair feel silky again after dying blonde

9/13/2026
1.0
verified purchase
Fake?

For some reason I cannot see the end of my review so writing the end here. I would recommend the real product. Mine might have be fake, my hair felt terrible after for the first time and I’ve used this product for maybe 6 months and have had a couple bottles last that long, this one was almost completely empty when I used it for the second time in the hopes my hair would feel fine. The formula looked and felt different to the point when I looked up videos to try to see the difference.

9/12/2026
5.0
verified purchase
Very effective on damaged hair

I have severely damaged hair from bleach and every time I use this product my hair becomes drastically softer, less frizzy, and has more shine

9/10/2026