K18

K18 is a biotech-driven haircare brand best known for its Leave-In Molecular Repair Hair Mask, which uses the brand's patented K18Peptide™ to reconnect broken keratin chains inside the hair shaft rather than simply coating the surface. The approach targets damage from bleach, color, chemical services, and heat. K18 suits anyone dealing with brittle, over-processed, or elasticity-depleted hair who wants a science-backed, stylist-recommended repair option.