Getting fuller, stronger lashes just got easier with LILYEVE GROW:TURN EXOSOME DUAL LASH SERUM this dual-ended lash serum packed with biotin, tocopherol and hyaluronic acid that works around the clock. During the day, use the black lash serum (with the curved spoolie) on one end for a mascara-like finish, and then at night switch to the transparent serum (with the rounded-tip spoolie) to nourish lashes while you sleep. The hypoallergenic formula helps condition lashes and support lash health.