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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.- 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 stars5 hours agoHeatBounce conditioning heat protectant
Leaves my hair shiney , healthy and super straight with using the flat iron. Love this product!
KK18Hair28 minutes 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!
- CourtneyVerified ReviewerReviewingFull-Size Leave-In Molecular Repair Hair Mask 50mLI recommend this productAge 35 - 44Hair Concern Heat damage, Fragile/brittle hair, DrynessHair Type Thick/Coarse, Straight/WavyMy Results Visible Difference, Stronger Hair, Less Breakage, Cleaner, fresher hair, Soft Touchable HairRated 5 out of 5 stars5 days agoHair Transformation
I started using this product over a year ago. My hair was brittle and breaking off like dog hair every day. My hair has transformed and the healthiest it’s ever been in my adult life. Follow the directions and don’t over is the product. I also use the heat protection from this line too when I chose to put heat to my hair and it’s made a difference too.
KK18Hair2 days agoThank you so much, Courtney! We're absolutely thrilled to hear about your incredible hair transformation over the past year! It's amazing that your hair has gone from brittle and breaking to the healthiest it's ever been in your adult life - that's exactly what we love to hear! We're also so happy the heat protection from our line is working well for you too. Your advice about following directions and not overusing the product is spot on! Thanks for your wonderful 5-star review and for sharing your experience!
- Brianna E.Verified BuyerReviewingFull-Size Leave-In Molecular Repair Hair Mask 50mLI recommend this productAge 35 - 44Hair Concern Chemical damage, Heat damage, Dryness, Split-Ends, FrizzHair Type Fine/Thin, Straight/WavyMy Results Less Frizz, Stronger Hair, Shinier Hair, Smoother Hair, Soft Touchable HairRated 5 out of 5 stars1 week agoThis has transformed my hair
I get bleach highlights every 6 weeks. I take really good care of my hair but there's only so much you can do when you bleach your hair. Ive been using this only 2 weeks and I got my hair done yesterday. My stylist was SO impressed with how healthy my hair is. She asked what I've been using and I told her! She told me she loves k18 as well!!
KK18Hair3 days agoThank you so much for this incredible review, Brianna! We're absolutely thrilled to hear that the Leave-In Molecular Repair Hair Mask has transformed your hair in just 2 weeks! It's amazing that your stylist was so impressed with how healthy your hair looked, especially with regular bleaching every 6 weeks - that's exactly what we hoped to achieve with our molecular repair technology! We love that she's a K18 fan too and that you're experiencing such fantastic results even with frequent chemical processing. Your feedback about how it's helping maintain your hair's health despite the bleaching truly means the world to us, and we're so grateful to have you as part of our K18 community!
- Jessica M.Verified BuyerReviewingHeatBounce conditioning heat protectant 4ozI recommend this productAge 35 - 44Hair Concern Chemical damage, Heat damage, Color-care, Fragile/brittle hair, Split-EndsHair Type Fine/ThinMy Results Less Frizz, Less Breakage, Stronger Hair, Defined Curl/Wave Pattern, Soft Touchable HairRated 5 out of 5 stars1 week agoThat smell!!
Wow this stuff smells soooooookoo good wow!!!
KK18Hair4 days agoThank you so much for this amazing review, Jessica! We're absolutely thrilled to hear that you love the scent of our HeatBounce conditioning heat protectant! Your excitement about the fragrance truly makes our day and means the world to us - we're so grateful to have you as part of our K18 community! 💛
- Christine C.Verified BuyerReviewingPEPTIDE PREP™ detox shampoo 8.5ozI recommend this productAge 55 - 64Hair Concern Dryness, Split-Ends, Chemical damage, Color-care, Heat damageHair Type Fine/ThinMy Results Visible Difference, Bouncy Hair, Stronger Hair, Less Breakage, Soft Touchable HairRated 4 out of 5 stars2 weeks agoPeptide Prep
The K18 Peptide Prep line is designed to deeply cleanse without stripping, and it genuinely delivers on that promise. Both formulas leave the hair feeling clean, light, and balanced — the kind of “reset” that makes styling easier and helps other products work better.
KK18Hair2 weeks agoThank you so much for this fantastic review, Christine! We're absolutely thrilled to hear that PEPTIDE PREP™ detox shampoo is delivering exactly what we designed it for - that perfect deep cleanse without stripping your hair! It's wonderful that you're experiencing that balanced, lightweight feeling and getting that amazing "reset" effect that makes styling so much easier. We're especially happy to hear how it's helping your other products work better too - that's exactly what we hoped to achieve with this chelating formula! Your feedback about how both formulas in the line are performing truly means the world to us, and we're so grateful to have you as part of our K18 community!
