Out of this world lashes & brows? Yes, please. Milani Highly Rated Lash + Brow Serum is a nightly serum designed to condition and strengthen hair for healthier-looking lashes and brows. When ed continuously to stain results, it helps improve the appearance of lash and brow thickness for longer, fuller-looking lashes and brows over time. The precise brush allows for targeted lash and brow application.