Free UK shipping over £25 15% off your app order Sign up for email exclusives Earn Cult Status Points
Enjoy £10 OFF when you spend £50, £20 OFF £100 and £30 OFF £120
K18 Biomimetic Hairscience

K18 Biomimetic Hairscience Leave-in Molecular Repair Hair Mask 15ml

You'll earn 30 Status Points with this product

Discover Cult Status

£30.00

Or 4 interest free payments of £7.50 with


In stock | Usually dispatched within 24 hours

Frequently Bought Together

K18 Biomimetic Hairscience Leave-in Molecular Repair Hair Mask 15ml

This item

K18 Biomimetic Hairscience Leave-in Molecular Repair Hair Mask 15ml

£30.00

Total Price:

£57.00

Other Customers Bought

Customer Reviews

4.56 stars out of a maximum of 5

5 stars rating 944 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.

Help for dry, damaged hair

5 stars out of a maximum of 5

Makes my hair feel smooth and soft.

by Kay Verified Purchase

Was this helpful?

This is the best hair mask

5 stars out of a maximum of 5

This is the best hair mask I've ever used. I have bright red hair which is bleached and then dyed, so it's always in pretty poor condition. This hair mask has saved my hair, it makes it feel so soft and is in much better condition than if I didn't use the mask. This is my third purchase - an absolute must for me.

by christmasjones Verified Purchase

Was this helpful?

Works on split ends

5 stars out of a maximum of 5

I’m very impressed with this leave in treatment, it’s probably the only product I’ve used that has actually corrected and repaired/re-bonded the split ends on my bleached hair so they’re no longer like candyfloss and that’s after only 2 applications! The improvement is dramatic and long lasting. The bottle is tiny but 3 pumps is enough for my long hair. Only negative is you can’t use conditioner prior to applying as this only works on pre shampooed hair as conditioner would stop it from absorbing and because I’m only applying to my split ends it means the rest of my hair is a bit dry from not using conditioner.

by Emma Verified Purchase

Was this helpful?

Results in one use

5 stars out of a maximum of 5

Impressed so far. Hair was smoother and looked less damaged after one use

by L Verified Purchase

Was this helpful?

Second bottle

5 stars out of a maximum of 5

Yes this is expensive but leaves my hair feeling wonderful. I’ve tried other products but they either leave my hair feeling mat or dirty like it need a wash the next day. This is great, I was sceptical about not using a conditioner but went with it the first time & loved the result. Will continue to buy although it is expensive!

by Maz Verified Purchase

Was this helpful?

This gives you goddess hair

5 stars out of a maximum of 5

My hair is overly processed the ends are bleached and I am currently growing out the blonde and this has turned my straw like hair into skin silk. No exaggeration this is magic. Make sure you apply this on hair after shampoo no conditioner wait the allocated time then apply your usual conditioner or leave in conditioner. It’s just wonderful. I have it in a mini size as well as the largest size so I have it when I travel.

by Sarahec Verified Purchase

Was this helpful?

Easy to use

5 stars out of a maximum of 5

Hoping this helps with my hair growth journey...it's pricey!!

by Faye Verified Purchase

Was this helpful?

K18

4 stars out of a maximum of 5

This works for me. I use it every time I wash my hair for 2 weeks after it's bleached, then 1-2 times a month afterwards. It does help my hair get back to a manageable and healthy state after bleach. It isn't like a normal hair mask though, it's meant to repair inside the hair. It's not conditioning at all. You can actually use conditioner with it, you just need to wait at least the 4mins before applying anything. I leave it longer. Also rub it between your hands so it goes white to make it easier to apply.

by Sara Verified Purchase

Was this helpful?

Repairing my hair

5 stars out of a maximum of 5

I’ve been trying a lot of products to help repair my damaged and broken hair. This product is amazing at helping with all the split ends and keeps it feeling smooth and shiny but overall a lot healthier. It does take a little while to get the full effect. But it’s worth it!

by Amy Verified Purchase

Was this helpful?

Immediate results

5 stars out of a maximum of 5

I know this product repairs over time but I have noticed a difference in my hair immediately. It’s so much more manageable. Will be buying again

by Gigi Verified Purchase

Was this helpful?