mini 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
- Frizz
- Value
- Anna S.ReviewingJumbo Leave-In Molecular Repair Hair Mask 100mLI recommend this productRated 5 out of 5 starsYesterdayIt saved 27 years of hair growth.
What can I say i havent had a hair cut since I was 12 . . . Ive had dreadlocks the last 6 years and also, yes, they are bleached. They are very well taken care of, olaplex, the works. But I started getting breakage after too much sun and one even snapped off. I. Was. Terrified. Quick google search threw me this stuff and my first thought is if its that expensive it will work. I emailed customer support to see if its suitable for dreads and they quickly responded. Used 3 x now alongside the chelating shampoo and the difference is insane. No longer breaking, they are so SOFT. The hair is also so much brighter. It works. I would have been fluffing devastated otherwise. Yes you actually can bleach hair and grow it and keep the Length. Bought the jumbo size worried as I have alot of hair (past my butt) enough for x3 goes and ill probly get another 6 out of it but bear in mind tho that this is 27 years worth of growth, so a little does really go a long way. A normal haired person could probs use for a year 😹 Id also add that the chelating shampoo is the best ive used. I use specialist shampoos for dreads but that one actually was better. Hair went from yellow toned to a bright blonde, i dont use toners FYI, wasnt expecting that as i bought it for the mask. You've a customer for life, thank you, and its well worth it. 🩷
KUK18Hair UKYesterdayThank you so much for this incredible review, Anna! We're absolutely thrilled that the Jumbo Leave-In Molecular Repair Hair Mask helped save your 27 years of beautiful hair growth and stopped the breakage you were experiencing. Your dedication to growing and maintaining your bleached dreads is truly amazing, and we're so honored to be part of your hair care routine now.
We're delighted to hear that both the mask and chelating shampoo exceeded your expectations - from the softness and brightness to the unexpected toning benefits! It sounds like you've found the perfect routine to keep your incredible length healthy and strong.
Thank you for being such a wonderful addition to the K18 community! 🩷
- Sara A.Verified BuyerReviewingMini Leave-In Molecular Repair Hair Mask 15 mLI recommend this productAge 25 - 34Hair Concern Chemical damage, Heat damage, Color-care, Frizz, Fragile/brittle hairHair Type Thick/Coarse, Straight/WavyMy Results Less Frizz, Stronger Hair, Less Breakage, Cleaner, fresher hair, Soft Touchable HairRated 5 out of 5 stars3 days agosaved my hair
I get my hair bleached and toned every 3 weeks as a natural dark haired girl and it keeps it from not only being stringy, damaged and frizzy but it helped with the thinning too and I get complimented on how healthy it is every time I go to get it done
KUK18Hair UK2 days agoThank you Sara! We're thrilled the Mini Leave-In Molecular Repair Hair Mask is keeping your bleached hair healthy and strong. We appreciate your amazing review! ✨
- Emma B.Verified BuyerReviewingJumbo Leave-In Molecular Repair Hair Mask 100mLI recommend this productAge 18 - 24Hair Concern Heat damage, Dryness, Color-care, Fragile/brittle hair, Chemical damageHair Type Medium DensityMy Results Stronger Hair, Less Breakage, Smoother HairRated 5 out of 5 stars4 days agoChanged my hair
I’ve tried so many products and this is the one that actually altered my hair for the better. This product isn’t just fluff.
KUK18Hair UK4 days agoThank you Emma! We're thrilled the Jumbo Leave-In Molecular Repair Hair Mask has truly transformed your hair. We appreciate you sharing your amazing experience! ✨
- Natalie H.Verified BuyerReviewingFull-Size Leave-In Molecular Repair Hair Mask 50mLI recommend this productRated 5 out of 5 stars1 week agoExpensive but worth it
If you dye your hair, this hair mask is an absolute must.
Is the only product that restores what feels like natural hair? And unlike other hair masks that I have used on dyed hair, this prevents my hair from going horribly frizzy in the rain or wet weather. I buy the 50 mL bottle which is £70 and I bought my last one a whole year ago so it does last lot. I have social link there so I use one pump each time. I contacted K 18 to ask how many pumps were in a bottle and in each millilitre there is one pump so 50 pumps for 50 mls.
The way to use it is once you’ve washed your hair with shampoo and no conditioner and you wrapped it in a towel when it is damp, I pump one pump onto my hand and I spread it out over my palms and fingers and I use both hand to massage it through the ends of my hair where it’s coloured avoiding the root and paying more attention to the front and the end of the hair. Then I blow dry my hair using a ceramic brown brush and a very hot hairdryer and I always get a really lovely shiny result which I would not be able to achieve without this hair mask.
Just a note about authenticity I between purchases I bought one on vintage thinking it was someone selling an unused unopened bottle but when it arrived it was clearly fake. I could tell that it was not genuine by The comparing the two bottles of the one from Vinted and the previous one I had from K 18. Do not be tempted to buy this product anywhere other than from the supplier. If it’s cheaper, it’s…
KUK18Hair UK1 week agoThank you so much for your incredible review, Natalie! We're absolutely thrilled to hear that the Full-Size Leave-In Molecular Repair Hair Mask has become such an essential part of your hair care routine. It's amazing that you've experienced that natural hair feeling restoration and that it's helping prevent frizz in wet weather - that's exactly what we love to hear from our community!
We're so happy the 50mL bottle has lasted you a whole year with one pump per use, and thank you for sharing those helpful application tips with other customers. Your detailed routine really shows how effective K18 can be when used properly, and we love that you're achieving those gorgeous, shiny results every time.
We also really appreciate you highlighting the importance of purchasing from authentic suppliers. It's so important that our customers get the genuine K18 experience and results they deserve.
Thank you for trusting K18 with your coloured hair and for taking the time to share such a thorough and helpful review. Your support means the world to us! ✨
- Lavanya V.Verified BuyerReviewingLeave-In Molecular Repair Hair Mask SampleI do not recommend this productRated 1 out of 5 stars1 week agoMolecular Repair Mask - Broken
Very bad packaging - arrived completely broken and product leaking. I could not even try & had to throw it away as the bottle was totally broken.
This is unacceptable for a product highly priced. I would actually give zero star.
I need a refund!!
KUK18Hair UK1 week agoHi Lavanya, we're so sorry to hear that your Leave-In Molecular Repair Hair Mask Sample arrived completely broken with the product leaking everywhere. We completely understand your frustration - receiving a broken product that you have to throw away without even being able to try it is incredibly disappointing. This definitely isn't the experience we want our customers to have with K18.
Please reach out to our team at customercare@k18hair.co.uk with your order details so we can process a refund for you and look into what went wrong with the packaging during shipping.