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

lindalemon

2

4/13/2026

There's better bond repair out there

I really tried to like K18. It kept getting recommended to me for my damaged hair, so I kept repurchasing it - but I have finally given up - here's why: 1. The price - the cost per fl oz is much more expensive than competitors (like Olaplex, Epres) 2. The science - it's just not there. In a head to head, Olaplex performed much better on actually healing hair damage. I feel like K18 uses a lot of science washing in their marketing without actually having the scientific support. 3. It's drying - my hair feels awful after using this. I've used it with different shampoos, conditioners, masks, leave ins, I just cannot get it to work for me. I have a very dry scalp and dry hair and it just isn't for me. I tried applying as Abbey Yung suggets (wait 4 min, conditioner after) and still that did not work for me. 4. The application - I find this SO difficult to apply evenly to my hair (again, compared to alternatives from Olaplex and Epres) - and it is annoying to wait 4 min post shampoo. 5. Maybe it's just not for dry hair types, but I noticed my hair was not improved from long term use (over 1.5 years of consistent use on recommended schedule). My hair never felt better or less damaged - so I officially give up

Originally posted on sephora.com

ajbeauty7

4

4/11/2026

4.5 stars

Giving it 5 stars for my relaxed hair and when I was transitioning to natural. Hair feels soft and manageable. 4 stars on my natural 4b hair. It's nice when I'm doing a blow dry or silk press

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Originally posted on sephora.com

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