Eyebrow enhancing serum by RapidBrow, Designed for visibly fuller-looking brows, Opthalmologist and Dermatologist tested, Apply to clean and dry brows, Use the applicator to fully cover brows, For best results use twice daily. Your beauty bags new BFF, RapidBrow channels some serious science know-how into its award-winning eyebrow-enhancing serum. Designed to help condition, restore and repair sparse-looking brows, its innovative formula aims to deliver results in as little as 30 days.