Looks like you're visiting from the UK, you're about to be redirected to our UK site

10
Done
Free Standard Shipping on $50+ Orders
free returns. buy with confidence
A product image featuring a colorful packaging box with 'K18' branding alongside two bottles of molecular repair mask and the detox shampoo placed outside the box on a purple background.
maximize damage repair in 2 steps
remove 99% buildup
get stronger, more resilient hair
step 1 prep for repair
step 2 repair
where K18 molecular repair works
artist spotlight: Tracy Debenport
4.7
Rated 4.7 out of 5 stars
4,862 Reviews

ultimate reset + repair duo

Bestsellers maximize damage repair in 2 easy steps
OR

Description

Get the ultimate damage repair with our peptide-powered detox shampoo + leave-in mask duo.

Use this detox + mask routine at least 1x per week to reset hair + scalp and repair damage.

PEPTIDE PREP™ detox shampoo

  • Prep the hair for maximum damage repair by massaging the detox shampoo into the hair and scalp.
  • Rinse thoroughly.

Leave-In Molecular Repair Hair Mask

  • After shampooing, do NOT condition.
  • Towel-dry hair.
  • Apply 1-3 pumps of molecular repair hair mask to mid-length and ends. Begin with 1 pump and build as needed.
  • Let sit for 4 minutes.
  • Do not rinse out.
  • Style as usual.

PRO tip:
Less is more with our highly concentrated formulas. Start with the minimum recommended amount + build as needed.

This 2-step routine is designed for optimal reparative results.

Start with the mini color-safe detox shampoo to create a clean hair canvas by effectively removing product buildup, excess oil + metals* common in tap + hard water. pH-optimized formula won't leave hair over-stripped or easily tangled. Follow with the full-size leave-in molecular repair hair mask, which repairs hair damage from bleach* + color*, chemical services* + heat* in just 4 minutes—restoring strength, softness, smoothness, and bounce.

*Disclaimers

one use of PEPTIDE PREP™ detox shampoo removes*:

  • 99% of product buildup
  • 95% of sebum
  • 76% of copper

One use of leave-in molecular repair hair mask delivers:

  • Improved strength and elasticity in hair damaged by bleach* + color*, chemical services* + heat.*

*Disclaimers

PEPTIDE PREP™ detox shampoo
Water (Aqua) (Eau), Sodium C14-16 Olefin Sulfonate, Cocamidopropyl Hydroxysultaine, Salicylic Acid, Charcoal Powder, sh-Oligopeptide-78, Panthenol, Glycerin, Sodium Phytate, GuarHydroxypropyltrimonium Chloride, Caprylyl Glycol, Caprylhydroxamic Acid, Citric Acid, Potassium Hydroxide, Sodium Hydroxide, Fragrance (Parfum), Benzyl Salicylate, Limonene.

leave-in molecular repair hair mask
Water (Aqua) (Eau), Alcohol Denat., Propylene Glycol, Cetearyl Alcohol, Dicaprylyl Ether, Cetyl Esters, Behentrimonium Chloride, Polysorbate 20, sh-Oligopeptide-78 (K18PEPTIDE™), Hydrolyzed Wheat Protein, Hydrolyzed Wheat Starch, Isopropyl Alcohol, Tocopherol, Phenoxyethanol, Potassium Sorbate, Citric Acid, Fragrance (Parfum), Geraniol, Linalool, Hexyl Cinnamal, Benzyl Alcohol.

pairs well with
K18 molecular repair hair oil
4.8
Rated 4.8 out of 5 stars
842 Reviews
Weightless oil that strengthens, repairs damage + reduces frizz
bestseller
AirWash™ dry shampoo
4.6
Rated 4.6 out of 5 stars
544 Reviews
Revolutionary dry shampoo for a fresh hair + scalp—even after your toughest workout

Description

Get the ultimate damage repair with our peptide-powered detox shampoo + leave-in mask duo.

got questions?
Get started here
No, the detox shampoo will not dry your hair out. This non-stripping formula has a pH of 3.8-4.2 that won’t leave hair over-stripped. In a consumer study, 90%* said hair feels clean without feeling dry. *k18hair.com/disclaimers
No, the detox shampoo will not strip your color. This color-safe formula is optimized with pH 3.8-4.2 to help maintain your color, and uniquely targets common metals present in tap and hard water that can cause dullness.
The shampoo is formulated with our patented K18PEPTIDE™ to help reduce protein loss during washing. So while it does leave hair feeling healthy and strong, the K18 molecular repair mask delivers the full dose of peptide-powered hair renewal. For best results, use the PEPTIDE PREP™ detox shampoo to prep hair for maximum K18 molecular repair results.
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.
Most see results after 2-3 uses of the K18 mask. The more damaged the hair, the more dramatic the results so it may vary depending on your hair type and level of damage.
Straight bleached hair after using K18 mask.
Straight bleached hair before using K18 mask.

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.
efficacy
patented K18PEPTIDE™ powers deeper + lasting repair.
simplicity
fewer steps for a streamlined routine.
speed
results in one 4-minute use.
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.

4.7
Rated 4.7 out of 5 stars
Based on 4,862 reviews
4,862 reviews
  • Emily S.
    Verified Buyer
    Reviewing
    Full-Size Leave-In Molecular Repair Hair Mask 50mL
    I recommend this product
    Age 25 - 34
    Hair Concern Chemical damage, Frizz
    Hair Type Medium Density
    My Results Less Frizz, Visible Difference, Less Breakage, Stronger Hair, Smoother Hair
    Rated 5 out of 5 stars
    2 weeks ago
    This worked after just two uses!

    I took a before photo to ask Chat GBT what product to use and it recommended K18. I have used it twice on damp hair per the instructions and already my hair looks much better! The second photo is my after picture.

    K Profile picture for K18Hair
    K18Hair
    2 weeks ago

    Wow, we love to hear it! So happy K18 is already making such a visible difference. Thanks for sharing your before and after journey with us, Emily!

  • Ginny B.
    Verified Buyer
    Reviewing
    ultimate reset + repair duo
    I recommend this product
    Age 45 - 54
    Hair Concern Chemical damage, Color-care, Frizz, Fragile/brittle hair, Dryness
    Hair Type Straight/Wavy, Medium Density
    My Results Smoother Hair, Visible Difference, Less Frizz, Soft Touchable Hair, Shinier Hair
    Rated 5 out of 5 stars
    3 weeks ago
    Detox & Repair who doesn't need this !

    I didn't realize how much my hair needed to be detoxed. I have well water but still it has hard water and minerals in it that gives me frizzy hair. This combo was a blessing for my 48 yr old aging hair. 🙌chemical, bleaching, coloring. If they can do it....I've done it. Now my hair is stress. Or rather it WAS! Now it's improving.

    K Profile picture for K18Hair
    K18Hair
    3 weeks ago

    We love that your hair is improving and no longer stressed - you deserve healthy, beautiful hair at any age! 🙌

  • Esther Y.
    Verified Buyer
    Reviewing
    Full-Size Leave-In Molecular Repair Hair Mask 50mL
    I recommend this product
    Age 35 - 44
    Hair Concern Chemical damage, Fragile/brittle hair, Color-care, Dryness
    Rated 5 out of 5 stars
    1 month ago
    Hair repair

    My bleached hair was so brittle and dry. K18 hair mask saved it after 2-3 uses

    K Profile picture for K18Hair
    K18Hair
    3 weeks ago

    It's amazing how quickly it can work its magic on damaged hair. Thanks for the amazing 5-star review!

  • Hailey B.
    Verified Buyer
    Reviewing
    Full-Size Leave-In Molecular Repair Hair Mask 50mL
    I recommend this product
    Age 25 - 34
    Hair Concern Heat damage, Color-care, Split-Ends, Dryness
    Hair Type Medium Density
    My Results Smoother Hair, Soft Touchable Hair, Shinier Hair, Less Breakage, Visible Difference
    Rated 5 out of 5 stars
    1 month ago
    I love this stuff!

    I have been using this for years and will forever keep using it. I recommend to everyone!

    K Profile picture for K18Hair
    K18Hair
    1 month ago

    Your loyalty and recommendation to everyone means the world to us. Thanks for the amazing review!

  • Denise B.
    Verified Buyer
    Reviewing
    Full-Size Leave-In Molecular Repair Hair Mask 50mL
    I recommend this product
    Age 55 - 64
    Hair Concern Chemical damage, Frizz, Dryness, Extending time between washes
    Hair Type Grey Hair, Straight/Wavy, Medium Density
    My Results Less Frizz, Visible Difference, Stronger Hair, Smoother Hair, Shinier Hair
    Rated 5 out of 5 stars
    2 months ago
    Magic in a bottle

    This product has transformed my hair!

    Why did it take me 60 years to discover it??

    K Profile picture for K18Hair
    K18Hair
    2 months ago

    Thank you so much for this amazing review, Denise! Your hair is beautiful! We love that you're experiencing the magic and appreciate you taking the time to share your wonderful experience!

recommended products
K18 molecular repair hair oil
4.8
Rated 4.8 out of 5 stars
842 Reviews
Weightless oil that strengthens, repairs damage + reduces frizz
DAMAGE SHIELD pH protective shampoo
4.7
Rated 4.7 out of 5 stars
426 Reviews
Color-safe protective shampoo maintains hair health + strength
Pro Distribution Partners

Paramount Beauty Supply
USA
Salon Services Pro
USA
Salon Service Group
USA
Salonwax Pro
USA
Premier Beauty Supply
USA
Launching Soon
Ozdare - Australia
AU
 
Launching Soon
American Crew Ltd. - New Zealand
NZ
 
Launching Soon
PlayGround - Hong Kong
HK
 
Launching Soon
Session Map - Sweden
SE
 
Launching Soon
Cyprus
CY
 
Launching Soon
Belgium
BE
 
Coming Early 2021
Canada
CA
 
Coming Early 2021
Czech Republic
CZ
 
Coming Early 2021
Finland
FI
 
Coming Early 2021
France
FR
 
Coming Early 2021
Germany
DE
 
Coming Early 2021
Ireland
IR
 
Coming Early 2021
Italy
IT
 
Coming Early 2021
Netherlands
NL
 
Coming Early 2021
Norway
NO
 
Coming Early 2021
Singapore
SG
 
Coming Early 2021
Taiwan
TW
 
Coming Early 2021
UK
UK
 
Coming Early 2021
thank you for visiting!

You are now being redirected to an official partner website for this region where you can shop K18 Hair.

Changed your mind? Go back.

00:00
subscribe + save 15%
healthy hair on your schedule
Pick your K18 + how often you want to replen.
We’ll send you a heads up before every delivery.
You’re in charge. Change the way you pay, skip a shipment, or cancel anytime.