full-size leave-in molecular repair hair mask
full-size leave-in molecular repair hair mask
A retail-sized version of the K18 mask helps to maintain your client's hair strength and elasticity in-between salon appointments. This leave-in treatment mask for all hair types that reverses damage in 4 minutes. Patented peptide technology works to repair damage from bleach + color, chemical services, and heat* — restoring strength, softness, smoothness, and bounce to hair.
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full-size leave-in molecular repair hair mask
Repairs Damage Caused By
Bleach + Color
Heat
Chemical Services
more to know
more to know
Takes damage repair further – biomimetic peptide seamlessly fits in and reconnects 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 repair
Restores hair from even extreme damage - by working at the innermost layer of the hair, core strength and elasticity are renewed for strong, smooth, bouncy hair
Delivers immediate and lasting results – hair is repaired from the first use and lasts past your next wash, for ongoing reparative benefits
Simplified repair - convenient, leave-in formula works in just 4 minutes, with no extra rinse required
Works on all hair types – because K18PEPTIDE™ works on a molecular level (where all hair is the same), this product is effective on all hair types and with every service
key benefits
key benefits
- K18PEPTIDE™ is a biotech-developed peptide that mimics hair's structure to reverse damage by reconnecting polypeptide chains and disulfide bonds broken during bleaching, color and chemical services, and heat*.
- pH-optimized (5.0-6.0) to help minimize cuticle swelling + put hair proteins in their most resilient state after salon service or shampoo
- Cream format enables easy, lightweight application across all hair types, with detangling and softening benefits.
- Vegan, color-safe, cruelty-free
how to use
how to use
- Shampoo, do not condition. Towel-dry thoroughly
- Apply 1-3 pumps of K18 leave-in molecular repair hair mask based on your length and density, starting at the ends and working up towards the roots
- Let sit for 4 minutes. Do not rinse out
- Comb, add product + style as usual. Use for 4-6 washes post-salon service, then as needed
ingredients
ingredients
- 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.
got questions?
how does the k18 mask work?
how does the k18 mask work?
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.
what is the K18PEPTIDE™ ?
what is the K18PEPTIDE™ ?
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*
why skip conditioner?
why skip conditioner?
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.
i noticed there's alcohol in the formula, isn't that bad for you?
i noticed there's alcohol in the formula, isn't that bad for you?
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).
when should i expect to see 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 it may vary depending on your hair type and level of damage.
soft, strong, bouncy hair for everyone
Repair damage for hair like new* in 4 minutes.
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"I absolutely love this product!!You have to see it to believe it!"
- Christina Marie P.
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"...I had my hair chopped (itwas begging for it) along withsome highlights and coloringof the roots. My hair stylistused this on my hair and Iabsolutely loved how it mademy hair feel ... I love this maskso much!"
- Ashley P.
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"Amazing the way it feels andthe shine provides to the hairinstantly."
- Sandra M.
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"l've been using this mask forabout four washes so far. I feelthat my hair is gettinghealthier."
- Olga S.
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"It makes my hair so soft andweightless, I absolutely loveit... Makes my hair feel soluxurious, it's like l just left thesalon. Can't recommend thisproduct more!"
- Anastasiia T.
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"My hair has been a mess foryears... My new hair stylistrecommended K18! ... My hairlooks and feels amazing withlasting results!!"
- Arnell M
how to use molecular repair mask
1. Shampoo, do not condition. Towel-dry thoroughly.
2. Apply 1-3 pumps based on your length and density, starting at the ends and working up towards the roots.
3. Let sit for 4 minutes. Do not rinse out.
4. Comb, add styling product + style as usual. Use for 4-6 washes, then as needed.
*k18hair.com/disclaimers
learn more on our blog
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October 24, 2024/PRODUCTS
how much leave-in mask do you *really* need?
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March 23,2023 / HAIR SCIENCE
the science behind k18 molecular repair
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December 08, 2024 / PRODUCTS
the top k18 mask fags
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February 25, 2025 / PRODUCTS
molecular repair for curly + coily hair
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February 10, 2026/PRODUCTS
how to use the k18 mask correctly.step-by-step
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February 10, 2026 / PRODUCTS
how to explain the k18 mask to clientsso they actually get it
