K18 = Sephora

K18 Biomimetic Hairscience

Get hair like new* with K18's biology-first haircare, designed to make the impossible possible.

Shop Now

Reviews

4.3

4,887 Reviews

5

4

3

2

1

3266

737

263

184

437

Recent Reviews

mzgray

Verified Buyer

5

1/27/2026

I was a skeptic but now I am a believer!

I was extremely apprehensive about trying k18 leave in mask because to me it was “overhyped” in the same manner that Olaplex was, but I decided to give it and try and I am throughly impressed by how different my hair feels in such a short time. I started to give 4 stars because the price is insane, but it works so it deserves its 5 stars.

Recommended

Originally posted on sephora.com

feebee16

5

1/26/2026

must have

My holy grail! I used to be bleach blonde for 3 years, and this was the product that made my hair healthy again

Recommended

Originally posted on sephora.com

Home

Shop

Stores

Account