repair + protect set
Limited-edition mini set repairs + heat protects for less breakage, more bounce
Reverse hair damage in 4 minutes* + prevent heat damage with patented tech that works deep within hair's innermost layers for soft, strong, bouncy results. Featuring molecular designs by Artist Jen Stark.
still have questions? visit our help center
what is the K18PEPTIDE™?
Patented biomimetic peptide uniquely matches and clicks into hair's keratin structure, reconnecting damage sites at the molecular level. K18PEPTIDE™ repairs multiple types of bonds and polypeptide chains for strong, soft, smooth, bouncy hair for all.
why do I need to skip conditioner before using the K18 mask?
Conditioner leaves a film that blocks K18PEPTIDE™ 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.
is HeatBounce activated by heat?
No, HeatBounce does not need to be activated to protect from heat.
Do I have to wait to use heat after applying HeatBounce?
No, you can blow dry or use hot tools immediately after applying HeatBounce.
how is HeatBounce different from traditional heat protectants?
HeatBounce is powered by resilicore™ heat-shielding technology, an innovation inspired by resilin—a natural protein that can withstand extreme temperatures. Unlike traditional heat protectants that only coat the outside cuticle layer of hair, the size + molecular makeup of resilicore™ allows it to penetrate deeper than ever before*, into the cortex where heat damage can occur, forming a protective shield that fortifies from within.
*Heat protection observed on hair in clinical testing after application of HeatBounce and use of 450℉ (232℃) flat iron on dry hair
Repair damage for hair like new* in 4 minutes.
See how K18 unlocks our community's expression
- Hair Texture
- Hair Repair
- Frizz Control
- Shine
- Manageability
- JulieVerified ReviewerReviewingFull-Size Leave-In Molecular Repair Hair Mask 50mLI recommend this productAge 55 - 64Hair Concern Chemical damage, Frizz, Dryness, Extending time between washesHair Type Fine/Thin, Curly/CoilyMy Results Less Frizz, Bouncy Hair, Shinier Hair, Stronger Hair, Visible DifferenceRated 5 out of 5 stars1 year agoLook no further
My hair stylist turned me onto this product. I have naturally curly hair which tends on the dry side and I color my hair. I have searched for a product for years that does what this product does for me. It is amazing the transformation in just one application sis for my hair. I find I actually need less styling product also, my hair now has a healthy moisture content and my curls have never looked better.
All the products I have tried to nourish and hydrate my curls have only done the opposite.
This product helps with my frizz and I find I can extend time between washes.
Call my 100% happy with K18 Leave In.
Highly recommend
KK18Hair1 year agoWe love this for you Julie! Thank you for this amazing review!
- Deborah L.Verified BuyerReviewingFull-Size Leave-In Molecular Repair Hair Mask 50mLI recommend this productAge 65+Hair Concern Fragile/brittle hair, Extending time between washes, DrynessHair Type Fine/ThinMy Results Visible Difference, Less Breakage, Smoother Hair, Shinier Hair, Stronger HairRated 5 out of 5 stars1 year agoWonderful product
My hairdresser started using this on me as my hair had started breaking off and drying out after a recent weight loss. The changes in my hair with this product along with the peptide prep shampoo are unbelievable! I now only wash my hair every 2-3, sometimes to the 4th day and my hair is so much healthier and fuller. Love your products!
KK18Hair1 year agoWe love your review! Thank you Deborah!
- Liz B.Verified BuyerReviewingFull-Size Leave-In Molecular Repair Hair Mask 50mLI recommend this productAge 25 - 34Hair Concern Chemical damage, Fragile/brittle hairHair Type Medium DensityMy Results Less BreakageRated 5 out of 5 stars1 year agoLess breakage!
My hair has been breaking so much less since starting K18 - the baby hairs around my crown are actually growing long for the first time! A life saver for my color treated hair
KK18Hair1 year agoHealthy and growing! Thank you Liz!
- Stacy D.Verified BuyerReviewingFull-Size Leave-In Molecular Repair Hair Mask 50mLI recommend this productAge 45 - 54Hair Type Straight/WavyMy Results Less Frizz, Bouncy Hair, Visible Difference, Less Breakage, Stronger HairRated 5 out of 5 stars1 year agoK18 unbelievably amazing!
I’ve been using this product along with a K 18 molecule repair oil for about three months and they have changed my hair. Before using them, my hair seem to be a little dry not shiny sort of blah but now after using them, my hair shines. It’s beautiful. I just love it..
KK18Hair1 year agoEnjoy your beautiful and healthy hair! We appreciate you Stacy!
- johanna f.Verified BuyerReviewingMini Leave-In Molecular Repair Hair Mask 15 mLI recommend this productAge 45 - 54Hair Concern Color-care, Heat damage, Chemical damageMy Results Bouncy Hair, Stronger Hair, Shinier Hair, Visible Difference, Defined Curl/Wave PatternRated 5 out of 5 stars1 year agoLove it 😍
This product had changed my hair in an amazing way. I cut off my hair. And started using this product It’s a life changing ♥️♥️♥️
KK18Hair1 year agoWe appreciate your review! Thank you Johanna!