Full-Size Leave-In Molecular Repair Hair Mask 50mL (2024)

best seller

Rated 4.7 out of 5

7808 ReviewsBased on 7808 reviews

4-minute leave-in treatment to reverse hair damage

Full Size - 50 mL $75.00 Mini Size - 15 mL $29.00

pairs well with

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K18 molecular repair hair oil

Rated 4.7 out of 5

602 ReviewsBased on 602 reviews

Weightless oil that strengthens, repairs damage + reduces frizz

Full-Size Leave-In Molecular Repair Hair Mask 50mL (24)Full-Size Leave-In Molecular Repair Hair Mask 50mL (25)

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.

20+ billion TikTok views🔥

*Disclaimers

Full-Size Leave-In Molecular Repair Hair Mask 50mL (26)

Full-Size Leave-In Molecular Repair Hair Mask 50mL (27)

Full-Size Leave-In Molecular Repair Hair Mask 50mL (28)

Full-Size Leave-In Molecular Repair Hair Mask 50mL (29)

Full-Size Leave-In Molecular Repair Hair Mask 50mL (30)

Full-Size Leave-In Molecular Repair Hair Mask 50mL (31)

Full-Size Leave-In Molecular Repair Hair Mask 50mL (32)

Full-Size Leave-In Molecular Repair Hair Mask 50mL (33)

Full-Size Leave-In Molecular Repair Hair Mask 50mL (34)

Full-Size Leave-In Molecular Repair Hair Mask 50mL (35)

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Get started here.

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.

the K18 difference

Feel what’s possible with fewer steps, less waste + less time.

Full-Size Leave-In Molecular Repair Hair Mask 50mL (48)

efficacy

Full-Size Leave-In Molecular Repair Hair Mask 50mL (49)

simplicity

Full-Size Leave-In Molecular Repair Hair Mask 50mL (50)

speed

how molecular repair compares

Full-Size Leave-In Molecular Repair Hair Mask 50mL (51)

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.

Full-Size Leave-In Molecular Repair Hair Mask 50mL (52)

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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Full-Size Leave-In Molecular Repair Hair Mask 50mL (55)

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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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Full-Size Leave-In Molecular Repair Hair Mask 50mL (59)

K18Hair

We appreciate your 5-star review! Thank you Alyssa!

Full-Size Leave-In Molecular Repair Hair Mask 50mL (2024)
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