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 937 reviews
4 stars rating 246 reviews
3 stars rating 84 reviews
2 stars rating 25 reviews
1 stars rating 21 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.
Small Amount Packs a Punch
Used this mask a few times, and a little goes a long way. Happy with the results so far, and my hair has a nice shine to it again
by Jonathan Verified Purchase
Was this helpful?
Great!
I have seen this product be reviews online for A long time and I finally bought it to try it out. I’m not dissapointed - it really turns my frizzy and dry hair smooth and silky.
by Yasmine Verified Purchase
Was this helpful?
Perfect!
Heaven in a bottle, never loved a scent as much as this one.. wish it lasted longer but it does seem to last longer than the other fragrances!
by Amy Verified Purchase
Was this helpful?
Where have you been all my life?!
I ummed and ahh'd about this for months as I couldn't quite believe it would be worth the money - it is. I have highlighted, processed hair that has started thinning thanks to the perimenopause, and breakage has started to become a real thing. After a single use of K18 my straw-like hair was butter soft and stayed that way through three shampoos. I can't comment on whether it's improved breakage as it's too soon but I suspect that if I continue to use this alongside my regular Olaplex treatments my hair will be transformed. Worth every single penny.
by Sarah Verified Purchase
Was this helpful?
Magic!
This mask is so so lovely!! I get very greasy hair so the thought of leaving a cream mask in my hair after shampooing was horrifying! But this mask literally disappears and leaves my hair so soft and silky! It almost feels like I’ve had a haircut when I use this for how much healthier my hair feels!
by Phoebe Verified Purchase
Was this helpful?
Amazing hair mask
You can see an immediate change in the hair, giving shine and a healthy look, convenient to use.
by Opal Verified Purchase
Was this helpful?
HG Product
This product has saved me for so many reasons! I love all things beauty, skincare and haircare but what I want most from a product is ease of use and results and K18 have nailed it with tis product! I love that I just shampoo and go leave it in for 4 mins whilst I'm doing my skincare routine and then its all good to style or go! A little goes a long way so although its on the more expensive side it does last forever!
by Clairelbear Verified Purchase
Was this helpful?
I can’t be sure on this product personally
I can’t be sure on this product personally as I didn’t specifically notice a difference from using no3 olaplex. They say a little goes a long way but even so this product ran out super fast which I was disappointed about and is unusual for me as most of my hair care lasts a long while. I also had to apply conditioner after the 3 minutes as my hair was like straw without the first time. I will probably purchase again in the future as this repairs the hair from the inside out unlike olaplex which I desperately need and it does have great reviews.
by ellie Verified Purchase
Was this helpful?
It works!
I hate to say it, but it actually works! The price is so high I wish it didn't work because now I will have to keep re-purchasing it. I have tried it all including Olaplex and this is the only product that makes a difference to my hair. Hair is smoother and shinier. I only use it every 3 washes now and my hair stays silky and smooth.
by Tereza Verified Purchase
Was this helpful?
A genie in a bottle
I was sceptical at first but this is a miracle worker. I use it now every 3-4 washes and when I do it instantly hydrated and revitalises my hair. I’ve tried so many other so called miracle products but I’ve now ditched them all in favour of this. I’m on my 3rd bottle and won’t ever look back.
by Lucy L Verified Purchase
Was this helpful?