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

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Recent Reviews

pvrevu

3

1/10/2026

K18 should make impenetrable safes instead robbing

K18 works but I see why this is the only product I've ever used that is made in a container you have to use your dad's tools to break it open to see the product inside. I feel very robbed!!!!

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Originally posted on sephora.com

MeAndMyShep

5

1/9/2026

Must Have if you color your hair!!

I love this stuff - I absolutely fried my hair last summer with too much bleaching while having some fun with coloring my hair. my hair literally broke off on one side. I had to get it cut but didn't have all of the damage cut as that would have been too short. I bought this stuff in early October (which is right after my hair broke) and given it is expensive - I use as k18 recommends - the first 6 shampoos following color treatment. by thanksgiving I was getting a lot compliments on how healthy my hair looked. it's January and I'm still using the same bottle - 1st 6 shampoos post coloring so it's working fantastic but I'm also able to stretch it out so I'm not having to repurchase all the time. Smell isn't great, but I put my leave in and styling products in after letting the product sit for 4 minutes and after that you can't smell it anymore so it doesn't bother me. Despite what I've seen on other reviews - you can't get results like this from another product (even Olaplex isn't this great) hopefully someday, the brand has more competition and prices come down, but in the meantime - it's absolutely worth every penny.

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Originally posted on sephora.com

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