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full-size leave-in molecular repair hair mask
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.
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*Disclaimers
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
The Science Behind K18 Molecular Repair
See how our K18PEPTIDE™-powered mask reverses damage in 4 minutes for lasting + progressive hair health.
molecular repair for aging hair
Hair evolves with age. This is how to support your strands throughout the years.- Kiersten V.Verified BuyerReviewingFull-Size Leave-In Molecular Repair Hair Mask 50mLI recommend this productAge 25 - 34Hair Concern Heat damage, Dryness, Fragile/brittle hair, Chemical damageHair Type Fine/ThinMy Results Less Frizz, Stronger Hair, Less Breakage, Smoother Hair, Visible DifferenceRated 5 out of 5 stars20 hours agoHAIR FOOD
I was honestly at the point where I thought my hair was beyond saving—years of bleaching left it dry, brittle, and constantly breaking. Then I tried the K18 hair mask, and I can genuinely say it completely transformed my hair.
After just a few uses, my bleach-blonde hair went from feeling like straw to actually soft, smooth, and healthy again. It doesn’t just sit on top of your hair like a typical conditioner—it feels like it actually repairs it from the inside out. My ends look less fried, my hair feels stronger, and I’ve even noticed less breakage when brushing.
What really surprised me is how lightweight it is. My hair feels silky without being weighed down or greasy, which is rare for something this hydrating. It’s like my hair finally has life in it again.
If your hair is dry, damaged, or over-processed like mine was, this is absolutely worth it. It didn’t just improve my hair—it genuinely saved it.
KK18Hair8 minutes agoThank you so much for your incredible review, Kiersten! 💛 We're absolutely thrilled to hear about your amazing hair transformation - going from feeling like your hair was beyond saving to having it completely transformed is exactly what K18 is all about! ✨ It sounds like you've experienced the true power of molecular repair, and we're so excited that your bleach-blonde hair went from straw-like to soft, smooth, and healthy again. We love that you can feel the difference of how it actually repairs from the inside out rather than just sitting on top like typical conditioners! The fact that you're seeing less breakage, stronger hair, and healthier-looking ends while still maintaining that lightweight, silky feel without any greasiness is absolutely wonderful to hear. Your hair definitely has life in it again, and we couldn't be more excited for you! Thanks for your fantastic 5-star review! 🙌
- Theresa H.Verified BuyerReviewingHeatBounce conditioning heat protectant 4ozI recommend this productAge 55 - 64Hair Concern Chemical damage, Heat damage, Color-care, Frizz, DrynessHair Type Fine/Thin, Thick/Coarse, Straight/Wavy, Grey HairMy Results Less Frizz, Bouncy Hair, Visible Difference, Stronger Hair, Soft Touchable HairRated 5 out of 5 stars3 days agoLOVE HEATBOUNCE !!
I absolutely LOVE this product and use it everyday! A little goes a long way. It's a great way to refresh hair between shampoos. Prefer using HeatBounce over using the K18.. Compliments K18 Dry Shampoo
KK18HairYesterdayThank you so much for your incredible review, Theresa! 💛 We're absolutely thrilled to hear that you LOVE HeatBounce and use it every day! It's amazing that you've discovered how a little goes a long way - that's one of the things that makes this product so special. We love that you're using it to refresh your hair between shampoos and that it's become your go-to over other products! It's also fantastic to hear how perfectly it compliments the K18 Dry Shampoo - what a dream team! ✨ Thanks for your wonderful 5-star review! 🙌
- Marlene T.Verified BuyerReviewingFull-Size Leave-In Molecular Repair Hair Mask 50mLI recommend this productAge 35 - 44Hair Concern Color-care, Split-EndsHair Type Fine/ThinMy Results Less Breakage, Smoother HairRated 5 out of 5 stars1 week agoNice product
Used right after I bleached my hair. Seemed to help keep it healthy!
KK18HairYesterdayThank you so much, Marlene! 💛 We're absolutely thrilled to hear that our Full-Size Leave-In Molecular Repair Hair Mask helped keep your hair healthy after bleaching! Using K18 right after such an intense chemical process is exactly when your hair needs that molecular repair the most. It's amazing that you could feel the difference it made in maintaining your hair's health! Thanks for your wonderful 5-star review! ✨
- Elena R.Verified BuyerReviewingPEPTIDE PREP™ detox shampoo 8.5ozI recommend this productAge 55 - 64Hair Concern Frizz, Fragile/brittle hair, Split-Ends, Dryness, Color-careHair Type Fine/ThinMy Results Bouncy Hair, Visible Difference, Soft Touchable Hair, Less FrizzRated 5 out of 5 stars1 week agoCreates Full Hair
I save this shampoo for Saturday morning so I have a wonderful Saturday hair day. My hair is always full, fluffy, and looks like I just got a blowout, after I use this detox shampoo.
KK18HairYesterdayThank you so much, Elena! 💛 We're absolutely thrilled to hear that PEPTIDE PREP™ detox shampoo has become your Saturday secret weapon! There's nothing better than that fresh-from-the-salon blowout feeling, and we love that our detox shampoo is giving you that full, fluffy hair you're looking for. It sounds like you've found the perfect way to treat yourself to amazing hair days! Your wonderful 5-star review means the world to us - thanks for sharing your fantastic experience! ✨
- Jane G.Verified BuyerReviewingHeatBounce conditioning heat protectant 4ozI recommend this productAge 45 - 54Hair Concern Split-Ends, DrynessHair Type Fine/ThinMy Results Visible Difference, Smoother Hair, Shinier HairRated 5 out of 5 stars2 weeks agoHeatBounce conditioning heat protectant
Leaves my hair shiney , healthy and super straight with using the flat iron. Love this product!
KK18Hair1 week agoThank you so much for your fantastic review, Jane! 💖 We're absolutely thrilled to hear that HeatBounce is giving you such amazing results - shiny, healthy, and super straight hair sounds perfect! It's wonderful to know our conditioning heat protectant is delivering exactly what you're looking for with your flat iron routine. Your 5-star review means the world to us!
