Lash & Brow Enhancing Serum - New and unopened BENEFITS Lash & Brow Enhancing Serum is a high-performance product formulated with clinically proven ingredients such as Capixyl™, which helps increase the strength and condition of brows and lashes. It also contains Fision KeraVeg18, a vegetable-based alternative to animal keratin which helps strengthen and improve the luster of lashes and brows.