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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

4.9

114 Reviews

5

4

3

2

1

102

10

1

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1

Recent Reviews

CCMackie

1

8/10/2025

Not for my thin hair

Too much for my thin, fine hair. I sprayed it on, relatively minimal, before I took the blow dryer to it. As I was drying it and after it was dry it felt gummy and I couldn’t run my fingers through it.

Originally posted on sephora.com

rosiebeauty2023

5

8/10/2025

Extra hydrating

[This review was collected as part of a promotion.] Conditioning heat protectant by k18 is very smoothing, rich and hydrating. I used it on my dry hair before using a flat iron and this product even with a small amount made my hair appear damp and defined my curls. I noticed that it was harder to straighten my hair maybe because my hair got too moist, requiring several passes. this product feels very hydrating and healthy for hair. It is definitely a good as a leave-in conditioner.

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Originally posted on sephora.com

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