K18 sells peptide hair care products to reverse hair damage.

K18 earns largely positive reviews as a reparative haircare brand that noticeably reduces frizz, boosts shine, and strengthens damaged, color‑treated, and fine hair, though results vary and some users see minimal improvement. Reviewers praise the Leave‑In Molecular Repair Hair Mask, lightweight Hair Oil, and innovative AirWash dry shampoo, while noting occasional heaviness or clumping if overapplied, harshness from shampoos on sensitive scalps, starchy/gritty AirWash residue with limited longevity, and inconsistency between sample and full-size performance.

About K18