Methylisothiazolinone (MI): L'Oréal no longer uses MI in its leave-on products

Methylisothiazolinone (MI): L'Oréal no longer uses MI in its leave-on products

Consumer safety is our first priority and we ensure that our products and their ingredients are safe and effective. In 2013, as methylisothiazolinone (MI), a commonly used preservative, was reportedly linked to skin sensitization for some consumers, L’Oréal took the decision to no longer use it in any of its leave-on products. We are also reducing MI levels globally for rinse-off products, even though they do not stay in contact with the skin. 

No new leave-on products are formulated with MI and this preservative is also being removed from existing products. In case of a brand acquisition, we make sure that this policy also applies. In Europe, the reformulation process is now completed in line with the new EU regulation requirements. It’s worth stating that MI has never been used in hypoallergenic products, nor in products destined for babies and children.

MI is a preservative that has been used for many years in many household and personal care products including cosmetics and even more recently as an alternative to parabens. However, a higher use has led to higher risk of allergic reactions. Preservation is absolutely key in ensuring a safe and effective use of cosmetics products without microbiological contamination. L’Oréal remains always attentive to new scientific developments, taking them into account when carefully selecting the right preservative system for each of its product. We encourage our consumers with questions on a product’s composition, to check the list of ingredients on the packaging.

To learn more about our preservation strategy, click here