Shield your hair from daily damage with the Olaplex Nº.9 Bond Protector Nourishing Hair Serum. Infused with OLAPLEX’s patented Bond Building Technology™, this lightweight, antioxidant-rich leave-in serum defends against pollution and heat styling up to 232°C. It helps smooth, detangle, and reduce static while boosting shine and manageability. Suitable for all hair types, it leaves hair soft, resilient, and visibly healthier after every use.