Enhance your natural lashes and brows with Covergirl Lash Blast Lash & Brow Serum. This eyelash serum is clinically proven to help lashes appear up to 24% longer in just 30 days. The brow growth and lash volume serum is infused with bamboo extract, biotin, peptides, and castor oil for thicker, fuller, and stronger lashes and brows.