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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

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4,941 Reviews

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Recent Reviews

MariaHN92

Verified Buyer

4

3/20/2026

My first impression with details

This is my first time trying out this product. Here is a little bit of background on my hair: - It is not dyed, very long, thick with tight and strong waves (I use Dyson Airstrait or Airwrap because I don't like my natural hair), so of course I have naturally dry and rough hair with a lot of frizz. I do have some heat damage but not very bad since the ends of my hair are still thick. I regularly use the Dyson Omega product line with heat protectant in it, but of course it is still not magic, although I think it helps and I have less breakage than before. On my washdays, I use Head & Shoulders shampoo (this is the only brand my scalp is happy with and healthy), Curlsmith pre-wash primer, Curlsmith conditioner or their deep conditioner mask (everything is without protein). I purchased the mini mask, and it was advised that I should use the maximum of 6 pumps (which is 2 pumps with the big size) for my hair. I sectioned my hair in half and used 3 pumps per section, so I used a total of 6 pumps (I did everything the same way as the brand suggested). I didn't use my pre-wash primer or any conditioner after shampoo, just my regular products for styling after the mask (I waited 4-5 minutes and didn't wash it out). My hair was soft and reacted well to the mask, although I felt that my hair did not like to skip the conditioner at all. :D It is still soft but very fluffy, but I will keep using it that way. As you can see, my hair is not in very bad shape, so I won't use it for 6 washes in a row, it would definitely damage my hair since the mask is recommended more for chemical damage, etc. Everyone has a different hair type and level of damage, so you need to figure out what works best for your hair (it is a highly concentrated bond builder, so be careful). I will use it once or twice per month max and I will just skip to the maintenance part.

Recommended

Originally posted on sephora.com

lxscott

Verified Buyer

5

3/17/2026

A now must-have in my hair routine!

I tried the K18 Leave-In Molecular Repair Hair Mask after coloring my hair and used it for my first four washes as recommended. It was super easy to use, just applied it after shampooing and skipped the conditioner. After a few uses, my hair felt noticeably softer, smoother, and less damaged. By the fourth wash, it looked healthier overall without feeling weighed down. Definitely worth it if you want a simple, effective repair treatment!

Recommended

Originally posted on sephora.com

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