⛔ Avoid
Is Methylisothiazolinone safe for perioral dermatitis?
Also known as: mi, mit, methylchloroisothiazolinone, mci
Verdict: Avoid
A widely-used preservative and a top contact allergen. The EU banned it in leave-on cosmetics due to sensitization. A significant PD trigger.
Where it appears
Methylisothiazolinone is a common ingredient found in everyday skincare, haircare, and personal care products. If you have perioral dermatitis, actively check every product label for this ingredient and its aliases.
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