Revitalize dry, damaged hair with the OGX Bond Protein Repair Sealing Serum. This strengthening hair serum is paraben-free, fights frizz & delivers healthy-looking hair that is softer, smoother, & stronger.** The strengthening hair serum delivers 2x smoother & up to 5x stronger hair after five washes* for beautiful, healthy-looking hair. Before bed, apply a small amount of the hair serum to your hands, rub together, & apply evenly to damp or dry hair working from the ends upward. You can leave the serum in overnight, there is no need to rinse it out. Use it with the entire OGX Bond Protein Repair line to cleanse, condition, treat, protect & style.