K18 = Sephora

K18 Biomimetic Hairscience

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

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Reviews

4.4

3,801 Reviews

5

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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

fantasticmrfox

5

1/23/2026

My hair cannot live without this stuff. Does your hair stick straight out when you hold the tips? It won’t after this! Your hair will cascade down like a waterfall. I recently ran out and notice a huge difference. So expensive but worth every cent.

Recommended

Originally posted on sephora.com

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