full-size leave-in molecular repair hair mask
4-minute leave-in treatment to reverse hair damage
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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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™?
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
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?
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?
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.
Repair damage for hair like new* in 4 minutes.
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
See how K18 unlocks our community's expression
- Effectiveness
- Texture
- Repair
- Appearance
- Value
- Debora R.Verified BuyerReviewingK18 x Future Society Limited Edition Scent MaskI recommend this productAge 55 - 64Hair Concern Color-care, Fragile/brittle hair, Dryness, FrizzHair Type Curly/CoilyMy Results Soft Touchable Hair, Defined Curl/Wave Pattern, Less FrizzRated 5 out of 5 stars1 hour agoIf you want your hair to smell divine…
You will love this…I already love K18 (won’t go without it for my dry curls), now I’m addicted to the “Future Society” scent! Highly recommend! Please don’t stop making it!🙏🏻
- Rachel A.Verified BuyerReviewingJumbo Leave-In Molecular Repair Hair Mask 100mLI recommend this productAge 45 - 54Hair Concern Heat damage, Fragile/brittle hair, Color-careHair Type Fine/Thin, Curly/CoilyMy Results Less Frizz, Bouncy Hair, Visible Difference, Smoother Hair, Soft Touchable HairRated 5 out of 5 stars1 hour agoA miracle in a bottle
Absolutely LOVE LOVE LOVE this mask! The summer sun always does its worst to my hair this gem fixes that and then some. Winter cold. Styling heat. Color fixes. K18 beats it every time. Must have for anyone with hair!
KK18Hair9 minutes agoThank you so much for the love, Rachel! 💙 We're thrilled to hear the Jumbo Leave-In Molecular Repair Hair Mask is your miracle worker! ✨ We truly appreciate your support!
- Julie N.Verified BuyerReviewingJumbo Leave-In Molecular Repair Hair Mask 100mLI recommend this productAge 45 - 54Hair Concern Chemical damage, Heat damage, Fragile/brittle hair, Split-Ends, DrynessHair Type Straight/WavyMy Results Visible Difference, Less Breakage, Stronger HairRated 5 out of 5 stars7 hours agoAn absolute must!
This molecule repair is amazing! My hair was chemically fried and this has made a huge difference in my hair.
KK18Hair6 hours agoThank you so much for the love! 💙 We're thrilled to hear the Jumbo Leave-In Molecular Repair Hair Mask has made such a huge difference for your hair! ✨
- Ehrrin K.Verified BuyerReviewingFull-Size Leave-In Molecular Repair Hair Mask 50mLI recommend this productAge 45 - 54Hair Concern Frizz, DrynessHair Type Thick/Coarse, Grey Hair, Straight/WavyMy Results Less Frizz, Visible Difference, Stronger Hair, Less Breakage, Defined Curl/Wave PatternRated 5 out of 5 stars8 hours agochanged my grey hair
My grey hair has been frizzy and feeling "hard." K18 made it soft again and transformed the frizz into waves. I'm a fan for life!
KK18Hair7 hours agoThank you so much for the 5-star review! We're thrilled to hear the Full-Size Leave-In Molecular Repair Hair Mask transformed your grey hair. We're so glad you're a fan for life! 💕✨
- Zsofia T.Verified BuyerReviewingFull-Size Leave-In Molecular Repair Hair Mask 50mLI recommend this productAge 35 - 44Hair Concern Chemical damage, Fragile/brittle hair, Split-EndsHair Type Fine/ThinMy Results Visible Difference, Less Breakage, Smoother Hair, Soft Touchable HairRated 5 out of 5 stars10 hours agoGreat mask for bleached hair
I was skeptical to wash my hair and skip the conditioner to apply this mask the correct way...but it works! I don't brush my hair wet, apply the mask, wait 4+ min then add some leave in conditioner and voila, my hair is as soft as ever! Started with the small version but ordered the big size since :-)
KK18Hair9 hours agoThank you so much for the 5-star review! We're thrilled you gave it a try and discovered the results! So happy you loved it enough to upgrade to the full-size. 💕✨