NYT > World News Why the E.U. Is Banning Some Gel Nail Polish Par :Christine Hauser and Simar Bajaj 3 septembre 2025 à 18:08 Starting this week, gel polishes that contain a key chemical ingredient can no longer be used in the bloc’s 27 member countries. © Lanna Apisukh for The New York TimesStarting this month, gel nail polish containing the ingredient trimethylbenzoyl diphenylphosphine oxide is banned in the European Union’s 27 member countries.