What is


Methylisothiazolinone / Methylchloroisothiazolinone

A mixture of two chemically similar preservatives found in many personal care products. Is is used to control microbial growth in water-containing solutions to avoid discoloration, unpleasant odors or product breakdown.


It is a chemically synthesized ingredient.

Consumer concerns and what we know

MIT and MCI have been associated with allergic reactions and eczema. The risk of allergy of MIT was confirmed in leave-on products, and as such, the European Commission prohibited the use of MIT in leave-on products in February 2017.
Permitted concentration of MCI is considered safe.

Our stance

We prohibited the inclusion of MIT/MCI in any product according to our safety criteria.