Olaplex Lash Bond Building Serum is a revolutionary lash treatment that combines OLAPLEX Peptide Complex Technology with Bond Building Technology. This lightweight serum promotes natural lash growth and retention, delivering visible results in as little as 4 weeks. Key features: • Promotes longer and more lifted lashes • Creates thicker and denser-looking lashes • Conditions and hydrates lashes • Shows results in as little as 4 weeks • Contains OLAPLEX Bond Building Technology • Features Peptide Complex Technology • Includes nourishing Hyaluronic Acid and Biotin The clear, lightweight formula should be applied along the upper lash line after dipping the brush once. Allow the product to air dry for at least 90 seconds before applying any eye makeup. Application to the lower lash line is not required. The serum contains key ingredients like Hyaluronic Acid for moisture retention and Biotin for lash health. Results are based on a consumer perception clinical study of 33 subjects over 4 weeks.