Something Rare Is Coming

The countdown has begun. Get ready for a fragrance worth the wait.

21

Hrs

59

Min

58

Sec

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

4.3

5,099 Reviews

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Recent Reviews

Lauren

4

8/5/2026

Bottle only lasts a few uses

I do love this and see a difference when I use it but I got through this soooo quickly I was shcoked. It says use 3 pumps but I have a lot of long, fine hair and I needed about 6 pumps to feel like it made a difference. Very disappointing it is so expensive for such little product

Originally posted on Sephora-uk

304ashley

Verified Buyer

1

8/4/2026

Fine and Low Porosity Beware

Got this after getting some bleaching done hoping to counteract some damage, instead this damaged my hair more. I was convinced that I fried my hair with bleach but it was this product instead. My hair was really dry and brittle after using, and it caused me a lot of breakage. I returned this and got a moisturizing hair mask instead, and my hair was back to normal. I followed the directions and all. I do not recommend for fine, low porosity, and/or protein sensitive hair.

Originally posted on sephora.com

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