Our powerful formula is designed to give you visibly longer, thicker and fuller lashes and brows by targeting their underlying nourishment and conditioning needs. It’ s the ultimate, clinically proven serum for all your lash and brow needs. That means lashes and brows that look longer, thicker, bolder and shinier—all in one. Results are clear within as little as four weeks and continue through 12 weeks. Plus, Lash + Brow Serum is ophthalmologist-tested, formulated free of prostaglandin, and safe to use even if you wear contacts.