Get Long, Curled Lashes with fLASH Eyelash Serum. Our serum is sold worldwide with happy customers around the globe thrilled with their lash results. Say goodbye to short, thin, sparse lashes and hello to gorgeous, flirty lashes. Don’t waste money on eyelash serums that aren’t effective. fLASH Eyelash Serum was developed by a physician to give you the lashes you’ve always wanted - no lash extensions needed! To ensure no irritation occurs, please follow application directions. Only apply 1 time per day. For those with sensitive skin/eyes we recommend applying the serum every other day for the first 10 days to ensure no irritation occurs.