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
- Bridgette B.Verified BuyerReviewingJumbo Leave-In Molecular Repair Hair Mask 100mLI recommend this productAge 25 - 34Hair Concern Fragile/brittle hair, DrynessHair Type Fine/Thin, Straight/WavyMy Results Stronger Hair, Less Breakage, Soft Touchable HairRated 5 out of 5 stars1 hour agoMask review
I’ve only used it twice, and I do believe I can tell the difference, my hair seems a little bit healthier
KK18Hair13 minutes agoThank you so much for the love! 💙 We're thrilled to hear you're already noticing healthier-looking hair with the Jumbo Leave-In Molecular Repair Hair Mask! ✨
- jacqueline j.Verified ReviewerReviewingFull-Size Leave-In Molecular Repair Hair Mask 50mLI recommend this productAge 55 - 64Hair Concern Chemical damage, Frizz, Fragile/brittle hairHair Type Medium Density, Thick/Coarse, Straight/WavyMy Results Less Breakage, Less FrizzRated 4 out of 5 stars3 hours agoPretty good
I recently totally fired my hair and after cutting half of it off, my hair was in very poor condition. I read about this stuff and thought I would try it. The result, I am pleasantly surprised. My hair is much better than it was. I did notice though that if I leave my hair air dry, it still feels dry. When I style it, a small bit of flat ironing the wave (at a very low heat) and put a bit of oil on the ends, my hair feels almost the way it did before it was fried.
I am only giving 4 stars because it is extremely expensive for the amount you get (my budget is limited) and it is very hard to get the product out of the container. Every time I have used it, I have to pump several times for the product to come out and barely any comes out with each pump, it is just a small dot with each pump. I know you don’t need a lot but it is like a pin head size with each pump.
KK18Hair1 hour agoThank you so much for the love! 💙 We're thrilled the Molecular Repair Hair Mask is helping restore your hair. We appreciate your feedback about the dispenser! ✨
- Danielle H.Verified BuyerReviewingK18 x Future Society Limited Edition Scent MaskI recommend this productAge 35 - 44Hair Concern Fragile/brittle hair, Frizz, DrynessHair Type Fine/ThinMy Results Less BreakageRated 5 out of 5 stars4 hours agoFine blonde hair.
I have fine blonde hair and get quite a bit of breakage around my face. This stuff has saved my hair
KK18Hair2 hours agoThank you so much for the love! 💙 We're thrilled to hear the K18 x Future Society Limited Edition Scent Mask is helping protect your fine blonde hair. We're so happy it's become a favorite! ✨
- Alia A.Verified BuyerReviewingMini Leave-In Molecular Repair Hair Mask 15 mLI recommend this productAge 35 - 44Hair Concern Chemical damage, Heat damage, Color-care, DrynessHair Type Thick/CoarseMy Results Less Frizz, Shinier Hair, Visible DifferenceRated 5 out of 5 stars7 hours agoWorks great
I love the product . It makes your hair shiny and looking healthy. It is great
KK18Hair5 hours agoThank you so much for the love! 💙 We're thrilled to hear you're loving how the Mini Leave-In Molecular Repair Hair Mask leaves your hair shiny and healthy-looking! ✨
- Sarah M.Verified BuyerReviewingJumbo Leave-In Molecular Repair Hair Mask 100mLI recommend this productAge 25 - 34Hair Concern Fragile/brittle hair, Heat damageHair Type Fine/ThinMy Results Visible Difference, Stronger Hair, Less BreakageRated 5 out of 5 stars13 hours agoIt works!
My hairdresser unprompted noticed that my hair health had improved a couple months after I started using this product! 5 stars!
KK18Hair12 hours agoThank you so much for the love! 💙 We're thrilled to hear your hairdresser noticed the improvement in your hair health! That's the best compliment. ✨