The Cosmetic Ingredient Review Expert Panel has identified a safe limit for cosmetic preservative methylisothiazolinone (MI) in leave-on cosmetic products that it hopes will send a signal to European regulators that the ingredient can be safely combined with methylchloroisothiazolinone (MCI) for effective preservative action.
During a June 9-10 meeting in Washington, D.C., the panel issued a Tentative Amended Final report for the use of MI in leave-on products, determining it safe if limited to 4 parts per million “and potentially at levels higher