Olaplex No. 9 Bond Protector Nourishing Hair Serum, in the 90ml size, is a nourishing leave-in treatment designed to protect and enhance the health of all hair types. This serum features Olaplex’s patented Bond Building technology to strengthen and repair hair bonds while providing a protective barrier against environmental stressors like UV rays and pollution. Infused with antioxidants and hydrating ingredients, it helps to reduce frizz, enhance shine, and improve overall manageability. Ideal for daily use, Olaplex No. 9 leaves hair feeling smooth, resilient, and revitalized.