K18Peptide penetrates deeper into the inner hair layers than conventional repair products and has the perfect size and composition to fit into broken keratin chains and reconnect them. This renews the hair with strength, softness, smoothness, and bounce. You can feel and see the difference after the first application. For best results, use it for the first 4-6 consecutive washes, then every 3-4 washes as needed to maintain hair strength.