K18 Biomimetic Hairscience Leave-in Molecular Repair Hair Mask 15ml
You'll earn 30 Status Points with this product
£30.00
Or 4 interest free payments of £7.50 with
In stock | Usually dispatched within 24 hours
Where science meets hair care, K18 believe that to truly care for our tresses, we must understand the biology behind it. Swapping out the lab coat and test tubes for a salon chair and hair tools, this brand is here to help you transform your locks from the comfort of your bathroom! Packed with a plethora of beneficial ingredients, namely their uniquely patented K18Peptide™, their hero product is a game-changer - or should we say mane-changer - that promotes healthier-looking hair. Can't think of a way to restore your hair's elasticity and bounce? Cue: the Leave-In Molecular Repair Hair Mask...
Does your hair need some TLC and a little... shaping? To the salon! Treat your locks to this at-home, leave-in formula that's infused with their unique patented K18Peptide that works on molecular level to repair even the most extreme damage! Let's pop on our lab coats for a quick second and give you the science-y low-down on this Leave-In Molecular Repair Mask. The patented peptide boasts a unique sequence of amino acids through the struggling strands to reconnect. The result? Stronger, softer, smoother and bouncier hair that's full of life. Boasting salon-like results in just 4 minutes, this concentrated formula is brimming with moisture magnets and protectors to leave your hair feeling prepped, primed and voluminous. Did someone say luscious locks alert?
Water (Aqua) (Eau), Alcohol Denat., Propylene Glycol, Cetearyl Alcohol, Dicaprylyl Ether, Cetyl Esters, Behentrimonium Chloride, Polysorbate 20, sh-Oligopeptide-78, Hydrolyzed Wheat Protein, Hydrolyzed Wheat Starch, Isopropyl Alcohol, Tocopherol, Phenoxyethanol, Potassium Sorbate, Citric Acid, Fragrance (Parfum), Geraniol, Linalool, Hexyl Cinnamal, Benzyl Alcohol.
For the latest information, it is recommended to review the ingredient list printed on the packaging of the product prior to usage or consumption.
Shampoo and rinse. Do not use conditioner, towel dry hair thoroughly, apply Leave-In Molecular Repair Mask and wait 4 minutes. Do not rinse out. After 4 minutes, apply styling products if desired and dry/style as usual.
Frequently Bought Together

This item
K18 Biomimetic Hairscience Leave-in Molecular Repair Hair Mask 15ml
£30.00
Customer Reviews
5 stars rating 948 reviews
4 stars rating 246 reviews
3 stars rating 85 reviews
2 stars rating 25 reviews
1 stars rating 22 reviews
Top Customer Reviews
Thanks for sharing your thoughts! Please remember that results will vary from person to person. We're proud to say that all customer reviews are independent, authentic and do not represent the views of Cult Beauty or The Hut Group.
Hate to say it but…
Totally didn’t think I’d love this product but sadly I do. (Sadly, purely just down to the price!) I have long, naturally curly, frizz prone hair so I need more of this than the recommended x2 pumps. My hair didn’t feel a whole lot different once blow dried but after straightening I was blown away by how nourished my hair felt having not used conditioner. Three days in and my hair still feels AMAZING. Total convert!
by Jo Verified Purchase
Was this helpful?
Easy to use
I am a fan of olaplex but thought I would give this a try as it seemed easier to use. My hair is quite fine and it certainly was more manageable but if I use it again I will only use on the ends.
by Gwenda Verified Purchase
Was this helpful?
Top notch!
This stuff is brilliant. I’ve tried so many serums and intensive conditioners that work ok but not brilliantly - this really does the job it says it does. You don’t need that much of it, which is good because it is ridiculously expensive for the amount you get, but honestly my hair is so swishy and silky afterwards. I love it.
by Rosamund Verified Purchase
Was this helpful?
Magic
This is hands down the most impressive hair product I have ever used. If I could give it a million stars, I would. I feel like I’ve been to a super expensive salon. The only downside is you will spend your day/night running your fingers through your hair and checking out the shine, every time you pass a mirror. It is worth every penny.
by JoJo Verified Purchase
Was this helpful?
Best hair product for a busy person
It seems expensive for the amount at first, but if you compare it to how much u need to spend on Olaplex products, then you'll see it's worth it. Also, I save so much time on not having to rinse off the conditioner/mask in the shower, plus then other treatments/products to achieve what this one mask achieves. It s just peeeeeerfect for my busy life. To get the same effect with Olaplex I had to use no 0+no 3+no 7. Who has time and money to go through that all the time? K18 mask is awesome for a busy professional (or a mom) who wants salon quality treatment and has little time. I don't even have to use any hair oils anymore, and works well no matter what shampoo I have used.
by Kate Verified Purchase
Was this helpful?
Nothing spectacular
I was told about this product by a friend who uses it and loves it. Not by a hairdresser or magazine review but someone I know who swears by it. It works for her slightly frizzy hair. To be honest I didn’t see any huge wow factor difference. Hair feels softer but I was hoping for a miracle as my hair is just so frizzy. Too many years of bleach. I’ll finish the bottle and see if it helps longer term but sadly not so impressed that I plan on re purchasing. I prefer Wonder Water in the shower for quick easy frizz free hair, or Hola Coco but that’s more of a faff.
by Joanne Verified Purchase
Was this helpful?
Nice but illogical
If this mask repaired my hair, why would I need to repurchase it? It does a lot of good things, and it makes my hair look and feel a lot better, but if my hair is still damaged when I stop using it I don't think it can claim to "repair" it. I'm on my second purchase. It does a decent job, and I use it in conjunction with my previous bond repairer (Olaplex 3) but I'm under no illusions that there is anything miraculous about it.
by Bellis Verified Purchase
Was this helpful?
Amazing
I have thick, wild out of control hair and this has really helped. It seems expensive but you do only need a very small amount. Highly recommend
by Lucy Verified Purchase
Was this helpful?
OMG
I’ve got thin coloured hair but after using this beauty it has a little more volume no dry ends no flyaways and feels like I’ve had a proper blow dry. Cannot live without.
by Lianne Verified Purchase
Was this helpful?
Magic in a bottle
Ok so I was introduced to this product by my hairdresser. Firstly when my hairdresser said hes using no conditioner on my hair just shampoo I nearly died. My hair is so awful without conditioner. He washed and towel dried my hair and used 2 pumps of K18 and omg I was blown away. I bought this as soon as I got home and its the best thing I've ever bought for my hair. I would highly recommend this product.
by Farhat Verified Purchase
Was this helpful?