New data submitted by trade group Cosmetics Europe failed to convince the European Commission's Scientific Committee on Consumer Safety that preservative methylisothiazolinone can be safely used in leave-on hair products or at higher levels in rinse-off cosmetics than previously recommended.
"MI has been used in up to 8.8 times higher concentrations than MCI for the past 10 years in cosmetic products, which has led to the current situation of high rates of contact allergy to MI in consumers," the committee states