A synthetic ingredient developed by the company that markets the lash- and brow-growth product RapidLash. According to the Personal Care Product Council's On-Line Infobase of ingredients, isopropyl cloprostenate is similar in form and function to bimatoprost, the prescription-only medication for glaucoma that was approved by the FDA to grow eyelashes and goes by the name Latisse. Although bimatoprost is a drug, isopropyl cloprostenate is classified as a cosmetic ingredient derived from fatty acids whose funtion is described as a hair conditioning agent. Yet given its chemical similarity to bimatoprost, it is theoretically possible that it will have the same effect on eyelashes (and eyebrow hair). Despite this theoretical association, there is no research proving that isopropyl cloprostenate has any effect on hair growth for eyelashes or eyebrows or whether or not the same serious side effects for bimatoprost would be true for isopropyl cloprostenate as well.