best seller
Rated 4.7 out of 5
7808 ReviewsBased on 7808 reviews
4-minute leave-in treatment to reverse hair damage
pairs well with
K18 molecular repair hair oil
Rated 4.7 out of 5
602 ReviewsBased on 602 reviews
Weightless oil that strengthens, repairs damage + reduces frizz
PEPTIDE PREP™ detox shampoo
Rated 4.8 out of 5
361 ReviewsBased on 361 reviews
Color-safe, non-stripping clarifying shampoo with the K18PEPTIDE™
Description
A leave-in treatment mask that works on the molecular level to reverse hair damage in just 4 minutes. The K18PEPTIDE™ is clinically proven to repair damage from bleach + color, chemical services and heat*– with immediate and lasting results to restore strength, softness, smoothness and bounce to hair.
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*Disclaimers
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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.
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*
*Disclaimers
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.
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).
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.
healthier hair with every use
Reverse damage in 4 minutes with our breakthrough K18 molecular repair technology.
the K18 difference
Feel what’s possible with fewer steps, less waste + less time.
how molecular repair compares
how K18 works
Traveling into the innermost layers of hair, our K18PEPTIDE™ renews strength along the width AND length of hair for lasting strength where it matters.
feel what's possible with K18
See how K18 unlocks our community's expression
reviews
average rating4.7out of 5
Based on 7808 reviews
5 Stars
6422 Reviews
4 Stars
699 Reviews
3 Stars
310 Reviews
2 Stars
148 Reviews
1 Star
229 Reviews
92%of reviewers would recommend this product to a friend
7808 Reviews
Age
Hair Concern
Hair Type
My Results
MM
Mewlissa M.Reviewed by Mewlissa M.
Verified Buyer
Reviewing
Mini Leave-In Molecular Repair Hair Mask 15 mL
I recommend this product
Age
45 - 54
Hair Concern
- Chemical damage
- Heat damage
Hair Type
- Fine/Thin
My Results
- Stronger Hair
- Less Breakage
Rated 5 out of 5
Review posted
Miracle for my super damaged hair
I’m so excited I found this!! My hair looks and feels great after 4 applications! The mini size was perfect to test this and I’ll be buying the larger size now!!
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Courtney K.Reviewed by Courtney K.
Verified Buyer
Reviewing
Mini Leave-In Molecular Repair Hair Mask 15 mL
I recommend this product
Age
25 - 34
Hair Concern
- Chemical damage
- Fragile/brittle hair
- Heat damage
Hair Type
- Fine/Thin
My Results
- Visible Difference
- Less Breakage
- Stronger Hair
Rated 5 out of 5
Review posted
Amazing
My hair started breaking after it was highlighted :( my friend who is a hairdresser recommended k18 hair mask. It has literally saved my hair. My hair feels fuller with more body, but most importantly it finally feels healthy again and i don’t see anymore breakage. I wish it was a little cheaper, but it’s worth the price IMO.
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AB
Ariana B.Reviewed by Ariana B.
Verified Buyer
Reviewing
Full-Size Leave-In Molecular Repair Hair Mask 50mL
I recommend this product
Age
18 - 24
Hair Concern
- Chemical damage
- Frizz
- Fragile/brittle hair
- Dryness
- Split-Ends
Hair Type
- Straight/Wavy
My Results
- Less Frizz
- Visible Difference
- Shinier Hair
- Smoother Hair
- Less Breakage
Rated 5 out of 5
Review posted
Works As It Says
Hair was pretty brittle & dry lately , a little bit dead too since I started using the leave in mask my hair looks better especially after drying & brushing it out way better looking then usual, this is my second time ordering this time it was the full size would definitely order again
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jOANNE V.Reviewed by jOANNE V.
Verified Buyer
Reviewing
Full-Size Leave-In Molecular Repair Hair Mask 50mL
I recommend this product
Age
65+
Hair Concern
- Frizz
Hair Type
- Thick/Coarse
My Results
- Visible Difference
- Stronger Hair
- Soft Touchable Hair
- Cleaner, fresher hair
- Smoother Hair
Rated 5 out of 5
Review posted
Miracle Hair Remedy
K18 Repair Hair Mask delivers what it promises! I developed the most incredibly frizzy hair during Covid (and my hair is normally straight). I couldn't even get a comb through it, and the products my hairdresser used did NOT work. This situation lasted almost two years! Finally, she found K18, and, overnight, my hair has changed. It is now soft, shiny, and STRAIGHT. I am very happy with this product!
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AP
Alyssa P.Reviewed by Alyssa P.
Verified Buyer
Reviewing
Full-Size Leave-In Molecular Repair Hair Mask 50mL
I recommend this product
Age
25 - 34
Hair Concern
- Heat damage
- Fragile/brittle hair
- Dryness
- Chemical damage
Hair Type
- Fine/Thin
My Results
- Stronger Hair
- Less Breakage
Rated 5 out of 5
Review posted
K18 review
K18 mark is the best hair product out there!
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K18Hair
We appreciate your 5-star review! Thank you Alyssa!