Each application of this sheer, lightweight eyelash serum delivers highly effective concentrations of new Olaplex Peptide Complex Technology™, Olaplex Bond Building Technology™, hydrating hyaluronic acid and biotin to the lash line to support and sustain the natural growth cycle and eyelash retention. Benefits: With Olaplex Lashbond Building Serum, your eyelashes will look longer and lifted Olaplex Lashbuild Building Serum will give you thicker and denser lashes Your lashes will look healthy and hydrated when using Olaplex Lashbond Building Serum. How to use: Dip the brush once and apply to the skin along the upper lash line on both eyes. Do not wash. Allow to dry for at least 90 seconds before applying other eye products. It is not necessary to apply it to the lower lash line. Use 2 times a day, in the morning and afternoon, on clean, dry skin.