K18 is a biotech-driven hair care brand that uses a patented biomimetic peptide to reverse damage at the molecular level. Unlike traditional bond builders that coat the outside of the hair, K18 reconnects broken keratin chains from within — in just 4 minutes. Clinically proven, vegan, cruelty-free, and color-safe. Recommended by our colorists at Reverie Salon after lightening services, color corrections, and chemical treatments. Professional salon products available for home use.