Preservativehigh risk Common irritant
Methylisothiazolinone
INCI · Methylisothiazolinone
A powerful preservative that has become a leading cause of allergic contact dermatitis.
Why dermatologists flag it
High sensitization rate - restricted in EU leave-on products since 2016
Names to look for on labels
Methylisothiazolinone appears under any of these names — manufacturers choose between INCI, common, and local-language terms freely.
MethylisothiazolinoneMITMI2-Methyl-4-isothiazolin-3-oneमिथाइलआइसोथियाज़ोलिनोन
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