OLAPLEX No. 4 Bond Maintenance Shampoo harnesses a patented BADD complex to reconstruct damaged hair from within, restoring strength, elasticity, and luminosity. This expertly formulated shampoo delivers deep hydration while fortifying hair against environmental stressors, making it suitable for all hair types. Enriched with coconut, argan, green tea, and biotin, it preserves color vibrancy in treated hair and works synergistically with OLAPLEX No. 3 treatments. Massage into damp hair, rinse thoroughly, and repeat as needed for optimal results.