Olaplex No.9 Bond Protector Nourishing Hair Serum is a lightweight, 90ml treatment designed to strengthen and protect hair bonds while nourishing strands from root to tip. It helps to reduce breakage, shield hair from environmental damage, and enhance smoothness and shine, making it ideal for maintaining healthy, resilient hair. Suitable for all hair types, this serum supports repair and long-lasting strength without weighing hair down.