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Olaplex No.9 Bond Protector Nourishing Hair Serum is a concentrated treatment designed to repair and protect stressed hair. This 20ml serum strengthens hair fibers by reinforcing bonds, reducing breakage and split ends. Its lightweight formula nourishes deeply without buildup, leaving hair smoother, shinier, and more resilient. Ideal for all hair types, it enhances manageability and extends the life of your color and style with expert care.