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A reader with intrepid sleuthing skills sent me the ingredients list for Lilash Eyelash Stimulator. I've been trying to find out what is in Lilash all year and the manufacturer, based in Scotsdale, is not very forthcoming. It turns out that the active ingredient is a prostaglandin analogue. Prostaglandin is the drug used to treat glaucoma that - because it may change the color of your eyes or even impact sight - has made eyelash growth products controversial to say the least.
Lilash also contains (in addition to five parabens and phenoxyethanol) a rather unpleasant preservative called methylchloroisothiazalinone. In high concentrations it can cause chemical burns and it is a skin and membrane irritant and so it was largely removed from most cosmetic products except for those with only short duration skin contact such as rinse-offs. There are some newer formulations that make it more acceptable to sensitive users, so it is now found in cosmetics more frequently. In the US accepted concentrations are 15 ppm in rinse-offs and 8 ppm in other cosmetic.
Water, Glycerin, Hydroxyethylcellulose, Panthenol, Lupinus Albus Seed Extract, Prunus Amygdalus Seed Extract, Silica, Methylchloroisothiazolinone, Phenoxyethanol, Methylparaben, Butylparaben, Ethylparaben, Propylparaben, Isobutylparaben, 9 alpha, 11 alpha, 15S-trihydroxy-17-Phenyl 18, 19, 20-Trinor-prosta-5Z, 13E-Diene-1-oic acid, Isopropyl Ester.