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K18

4.6 • 37 Reviews

K18 sells peptide hair care products to reverse hair damage.

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K18 Reviews

4.6

K18 earns strong reviews for visibly repairing damage—especially on bleached or heat-stressed hair—delivering soft, shiny, frizz-tamed results with its Leave-In Molecular Repair Hair Mask and supportive shampoos, oils, and the AirWash dry shampoo. Reviews also flag drawbacks: inconsistent results for healthy or fine hair, occasional heaviness or clumping if overused, starchy or scalp-icky residue from AirWash, and shampoos that can feel harsh or drying.

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Reviews and Posts

View all 37

  • 10mo ago

    I loooveee k18!! I hate how much it is and how much my hair loves it. The hair oil has become a holy grail for my fine hair, it detangles and protects my hair so well. The repair mask is really nice as well.

  • 8mo ago

    The K18 Leave-In Molecular Repair Hair Mask is a standout in the “hair repair” category. It leverages a genuinely different technology (peptide-based, inside-the-strand repair) rather than just smoothing or coating hair. For the right hair conditions (damage, breakage, chemical/heat stress), it delivers visible and lasting improvement. If your hair is healthy and you just want a nice mask, you might prefer to spend elsewhere. But if you’ve been lamenting damaged ends, limp texture or persistent frizz, this product is absolutely worth the investment. Make sure you activate the product by rubbing it between your hands until it becomes opaque!

  • 8mo ago

    As someone with fine but thick oily (oily as heck!!) hair, this product is a GODSEND!! I’ve primarily used aerosol based dry shampoos and they’ve worked well, but this dry shampoo absolutely takes the cake! It doesn’t leave any white residue and it lasts forever. I sprayed just a few sprays into my hair, waited 2 minutes, and brushed and OMG it worked so well! It seriously felt like I had washed my hair!!

  • 1y ago

    Everything I've tried from K18 has been really excellent for my hair, especially the new Airlift volumizing product. It's really unique in the marketplace and I find it gives me lift without any stickiness, buildup or heaviness, which is hard to find for fine hair. The dry shampoo is also very unique compared to other brands — no aerosol and it feels almost wet going on but really makes a difference in extending my hair between washes. These products are pricy, so it's a good brand to try mini/travel sizes first to see if they work for you.

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What is K18?

K18 sells peptide hair care products to reverse hair damage.