WHERE YOU CAN FIND THEM + WHY MADEWITH DOESN’T ALLOW THEM
Methylisothiazolinone + methylchloroisothiazolinone are known allergens. They are skin and membrane irritants and cause chemical burns. They can cause lesions and dermatitis, which may be further aggravated by sun exposure. These ingredients are generally found in cream + liquid beauty products and personal care products.
WHERE THEY’RE BANNED OR RESTRICTED
Methylisothiazolinone + methylchloroisothiazolinone are restricted in the EU and Canada to rinse-off products. They are banned from products that stay on the skin.
WHERE WE'RE GETTING OUR INFORMATION
 Government of Canada. “Hotlist” of ingredients banned or prohibited in cosmetics and personal care products. (2019). https://www.canada.ca/en/health-canada/services/consumer-product-safety/cosmetics/cosmetic-ingredient-hotlist-prohibited-restricted-ingredients/hotlist.html#t2m
 Chemical and Engineering News. Preservative in leave-on cosmetics banned in the EU. (2016). https://cen.acs.org/articles/94/i16/Preservative-leavecosmetics-banned-EU.html
 NIH. NCBI. Methylisothiazolinone contact allergy: a review. (2011). https://www.ncbi.nlm.nih.gov/pubmed/21777214
 NIH. NCBI. Methylisothiazolinone (MI) is the American Contact Dermatitis Society Contact Allergen of the Year for 2013. (2013). https://www.ncbi.nlm.nih.gov/pubmed/23340392
 The Dermatologist Journal. Methylisothiazolinone/Methylchloroisothiazolinone must be considered strong allergens. (2016). https://www.the-dermatologist.com/content/update-isothiazolinones