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

350 Reviews

5

4

3

2

1

208

90

28

9

15

Recent Reviews

raeraes

Verified Buyer

5

10/14/2026

Great product!

Ok, so I didn’t want this to work because it’s pricey….but unfortunately it works really well! I have been going through a ton of health issues and changes. Between that my new medication my fine hair was looking even thinner. I have been using this for a month and my hair is already starting to look fuller, the thin spots are filling in, and overall healthier. K18 is run by wizards apparently.

Recommended

Originally posted on sephora.com

eemilyannee

Verified Buyer

5

10/12/2026

Game changer.

This has changed the game for me. I think people forget that with any hair serum you have to go through an adjustment phase. You lose a bit of hair first, that’s the cycle before you gain hair. Old has to make way for new.

Recommended

Originally posted on sephora.com

Home

Shop

Stores

Account