K18 is a leave-in molecular repair hair mask that utilises a patented bioactive peptide (K18Peptide™) to repair damaged hair from the inside out. This treatment works by reconnecting broken keratin chains, which are essential for hair strength and elasticity, and reverses damage caused by chemical services, heat, and other stressors. K18 is a vegan, colour-safe, and cruelty-free product that can be used on all hair types.