Why was methylisothiazolinone banned in leave-on products?

The EU banned methylisothiazolinone from leave-on cosmetics after a documented rise in contact allergy.

Preservatives responsible for a documented epidemic of contact allergy through the 2010s, which led the EU to ban methylisothiazolinone from leave-on cosmetics. Co-reaction between members of this group is common.

Information, not medical advice. A suspected contact allergy should be confirmed by a dermatologist through patch testing.