Obagi's Nu-Cil Eyebrow Boosting Serum enhances the appearance of thinning, patchy, and over-plucked brows. Powered by NouriPlex Technology, this clinically-proven formula addresses the look of sparse brows, improving their fullness, thickness, and darkness. In a 12-week blinded study, 100% of participants reported noticeable brow fill improvement, and 96% saw enhancements in brow density and volume. * *Results based on a 2022 study. Data on file at Obagi Cosmeceuticals LLC.