Per Wesite:This breakthrough, ophthalmologist-formulated lash conditioner enhances the health and beauty of lashes using encapsulated time-release technology that's designed to be gentle on sensitive eyes. Powerful peptides and botanicals protect against breakage and brittleness while improving flexibility and shine for bold, beautiful, lush lashes.In an independent 8-week consumer study of 161 participants, where nearly 20% had experienced sensitivity/irritation to other lash serums they'd used in the past:98% experienced healthier lashes96% experienced stronger, more nourished lashes97% did not experience redness93% did not experience irritation