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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

4.5

1,142 Reviews

5

4

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2

1

886

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70

Recent Reviews

Maddiepelle

1

3/6/2026

Waste of money. Marketing gimmick.

Probably one of the worst hair oils I have ever used. It left my thin damaged hair extremely oily and made my breakage very visible. Terribly over priced to what seems to be comparable to coconut oil from Wallgreens. Deeply disappointed.

Originally posted on sephora.com

lkarch

Verified Buyer

5

2/22/2026

Best Hair Oil I’ve Ever Used — and I’ve Tried Ever

I have naturally curly hair that’s been seriously damaged from years of color and heat styling, so I’ve tried everything — luxury oils, drugstore oils, masks, serums… you name it. This is hands down the BEST hair oil I’ve ever used. It instantly smooths frizz without weighing my hair down, adds real shine (not greasy shine), and somehow makes my ends look healthier after just one use. My hair feels softer, looks smoother, and actually behaves — even when I air dry. The biggest difference for me? It makes damaged, over-processed hair look polished instead of fried. If you have color-treated, heat-damaged, or naturally curly hair — you need this.

Recommended

Originally posted on sephora.com

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