Obagi Nu-Cil™ Eyelash Enhancing Serum is powered by Nouri-Plex® Technology, a clinically-proven blend of ingredients designed to address the appearance of thinning, sparse lashes. 89% of participants reported improvement in the appearance of the density of their lashes* 89% of participants reported an improvement in the appearance of the thickness of their eyelashes* *Results based on a 2021 16-week blinded study. Data on file at Obagi Cosmeceuticals LLC. Please note that the Obagi Nu-Cil™ Eyelash Enhancing Serum has been updated from silver to purple packaging. The quality and formula of the Obagi Nu-Cil™ Eyelash Enhancing Serum remains the same.