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mini leave-in molecular repair hair mask

4-minute leave-in treatment to reverse hair damage
Rated 4.6 out of 5
Based on 6502 reviews

A leave-in treatment mask for all hair types that clinically reverses damage in 4 minutes. The patented peptide technology works to repair damage from bleach, color, chemical services & heat ā€“ restoring strength, softness, smoothness, and bounce to hair.

11+ billion TikTok viewsĀ šŸ”„Ā 

Repairs Damage Caused By

  • Bleach + Color Bleach + Color
  • Heat Heat
  • Chemical Services Chemical Services
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more to know

The K18PEPTIDEā„¢ works at the innermost layer of hair, reconnecting polypeptide chains and disulfide bonds broken during bleaching, chemical services, and through heat damage.


By addressing these damage sites at the innermost layer of hair, core strength and elasticity are renewed for strong, smooth, bouncy hairā€”even after the most extreme damage done in the salon or at home.

key benefits

  • Powered by the patented K18PEPTIDEā„¢, engineered over 10 years in a biotech lab to work on the molecular level to rebuild hair from the inside out in just 4 minutes.
  • Because the K18PEPTIDEā„¢ works at the molecular level, it works on every single hair type
  • Clinically proven to reverse hair damage from: Bleach + Color, Chemical Services, Heat
  • Restores strength, softness, smoothness, and bounce
  • Immediate + progressive results
  • Vegan, color-safe, cruelty-free

how to use

  1. Shampoo, do not condition.
  2. Towel-dry thoroughly.
  3. Begin with 3 pumps of K18 mask, only add more as needed depending on length, thickness, and condition. Apply all over, one pump at a time, maximum dosage is 9 pumps.
  4. Let sit for 4 minutes. Do not rinse out.
  5. Then comb + style as usual (fine to add heat protectant or styling product now).
  6. Use for the first 4-6 washes, then as needed.

how to optimize K18

  • DO clarify before K18 if youā€™re a heavy product user (demineralize for mineral + metal buildup)
  • DO apply on clean, damp hair
  • DO wait the full 4 minutes before combing or styling
  • DO add whatever styling products you love after the 4 minutes
  • DO use for 4-6 shampoos consecutively for progressive results.
  • DON'T use conditioner before applying K18 Mask (you can apply after the 4 min but most find they donā€™t need it)
  • DON'T overdo itā€”less is more
  • DON'T rinse it out

ingredients

Water (Aqua) (Eau), Alcohol Denat., Propylene Glycol, Cetearyl Alcohol, Dicaprylyl Ether, Cetyl Esters, Behentrimonium Chloride, Polysorbate 20,sh-Oligopeptide-78 (K18Peptideā„¢), Hydrolyzed Wheat Protein, Hydrolyzed Wheat Starch, Isopropyl Alcohol, Tocopherol, Phenoxyethanol, Potassium Sorbate, Citric Acid, Fragrance (Parfum), Geraniol, Linalool, Hexyl Cinnamal, Benzyl Alcohol.

Description

A leave-in treatment mask for all hair types that clinically reverses damage in 4 minutes. The patented peptide technology works to repair damage from bleach, color, chemical services & heat ā€“ restoring strength, softness, smoothness, and bounce to hair.

11+ billion TikTok viewsĀ šŸ”„Ā 

what you can expect
by damage type

backed by science,
loved by stylists

Our community of stylists and colorists believe K18 is liberating hairā€”no matter the hair type or generation.

ā€œK18 allows me to go everywhere I want to go with my color work and the end result is my guests get to be bright and shiny and healthy.ā€

ā€“ Christine Thompson, Director of Color at Spoke & Weal

got questions?

Get started here

how does the K18 mask work?

K18 works as a treatment to reverse damage in 4 minutes. How it works is a lot like makeup vs. skincare. Concealers (i.e. most hair products) temporarily cover up a problem. K18 works like retinol, highly concentrated, working on a deeper level to renew that base health so you can wear less concealer in the future. Pretty cool right?

What is the K18Peptideā„¢?

Our biomimetic peptide mimics hairā€™s natural structure to seamlessly fit in and reconnect broken keratin chains responsible for hairs core strength and elasticity. As a result of this reconnection it also addresses cleaved disulfide bonds for connection along the Y-axis of hair AND the x-axis or width of hair.

why skip conditioner?

Conditioner leaves a film on the cuticle that blocks our peptide from penetrating into the innermost layers 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 thereā€™s alcohol in the formula, isnā€™t that bad for you?

We like to keep our formulas minimal, only using the exact ingredients needed to get the peptide where it needs to go. Our unique blend of 3 alcohols functions to open up the hair cuticle so the K18PEPTIDEā„¢ can penetrate the innermost layer of hair, reaching the broken polypeptide chains (keratin chains). Here the alcohol serves as an agent to optimize the hair environment for K18 mask to work on a deeper level and give you the best results.

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 results may vary depending on your hair type + level of damage.
reviews
average rating 4.6 out of 5
Based on 6502 reviews
  • 5 Stars
    5286 Reviews
  • 4 Stars
    617 Reviews
  • 3 Stars
    271 Reviews
  • 2 Stars
    133 Reviews
  • 1 Star
    195 Reviews
92% of reviewers would recommend this product to a friend
Customer photos and videos
6502 Reviews
Reviewed by Mariah L.
Verified Buyer
I recommend this product
Age
25 - 34
Hair Concern
  • Fragile/brittle hair
  • Split-Ends
  • Dryness
Hair Type
  • Fine/Thin
My Results
  • Less Breakage
  • Visible Difference
  • Smoother Hair
Rated 5 out of 5
Review posted

Love

I love this stuff, I feel like it has really helped my hair

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Reviewed by cherece r.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

love it!!

I switched from using the OLAPLEX #3 when I discovered K-18. It is so easy to use that I know my clients are much more likely to actually use it. My hair is feeling amazing!

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Reviewed by Rachel Rachel N.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

Truly, amazed

I did not think a four minute mask would work, but I was so wrong. My hair feels so healthy and soft. The first day I was impressed, but after the third wash, I was so amazed Iā€™m ready to buy the whole line now. This treatment is no joke.

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Reviewed by Lisa J.
Verified Buyer
I recommend this product
Age
55 - 64
Hair Concern
  • Chemical damage
  • Color-care
  • Frizz
  • Fragile/brittle hair
Hair Type
  • Fine/Thin
My Results
  • Less Frizz
  • Stronger Hair
  • Soft Touchable Hair
  • Smoother Hair
  • Shinier Hair
Rated 5 out of 5
Review posted

Love this stuff

Love how it makes my hair lookā€¦. Healthy and vibrant!

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Was this helpful?

K18Hair

Thank you for your review Lisa!

Reviewed by Mary M.
Verified Buyer
I recommend this product
Age
55 - 64
Hair Concern
  • Frizz
  • Chemical damage
Hair Type
  • Curly/Coily
My Results
  • Less Frizz
  • Visible Difference
  • Defined Curl/Wave Pattern
  • Soft Touchable Hair
  • Shinier Hair
Rated 5 out of 5
Review posted

Great hair repair product!

K18 has transformed my hair. My hair is healthier and less damaged looking after using K18 only four times.

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K18Hair

Thank you for your review Mary.

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