Is Methylchloroisothiazolinone safe during pregnancy?
Preservative usually paired with MI (Kathon CG) in rinse-off products. Main concern is skin allergy, not pregnancy.
PregnancyUse with care
BreastfeedingUse with care
EvidenceLimited
What the sources say
A review notes the MCI/MI blend is one of the most frequent causes of preservative contact allergy and that both are skin sensitizers. No pregnancy- or breastfeeding-specific concerns were identified in sources, but there are no pregnancy studies. Limit: rinse-off products are lower risk; stop if you develop a rash.
Common alternatives
Also listed as
5-chloro-2-methyl-4-isothiazolin-3-one, cmit/mit, kathon cg, mci, mci/mi, methylchloroisothiazolinone/methylisothiazolinone
Sources
Last reviewed . This is general information, not medical advice. Ask your doctor or midwife about your own situation.