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Is methylchloroisothiazolinone safe during pregnancy?

Reviewed by · Last reviewed

Pregnancy-Safe Ingredients Database — 28,000+ Ingredients Rated
methylchloroisothiazolinone
NO KNOWN RISKS
93
/100
0

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Authoritative references used to score this ingredient.

Frequently asked questions

Is methylchloroisothiazolinone safe during pregnancy?
No harmonised reproductive classification (no H360/H361) for methylchloroisothiazolinone; regulatory assessments and reviews focus on skin sensitisation and local toxicity rather than reproductive or developmental effects (ECHA Annex VI, CIR, SCCS reviews). Dermal cosmetic use can give low but measurable systemic exposure, so exposure is scored low (e=1) for pregnant users (CosIng, PubChem, ECHA dossiers).
Is methylchloroisothiazolinone safe while breastfeeding?
No evidence in authoritative sources of reproductive or lactation-specific toxicity or classification for developmental toxicity; primary hazard is skin sensitisation. Systemic exposure from topical cosmetic use is low but measurable, so exposure is rated low (e=1) for nursing parents (ECHA Annex VI, CIR, PubChem, CosIng).
Is methylchloroisothiazolinone safe for baby skin?
No specific data indicating reproductive/developmental toxicity in infants; primary well-documented risk is contact allergy/sensitisation rather than systemic reproductive hazard (ECHA Annex VI, CIR, SCCS). Because infant skin has higher permeability/SA:wt and MCI has measurable dermal absorption in adults, exposure for babies is increased by one category (adult e=1 → infant e=2), raising concern mainly for local sensitisation rather than systemic reproductive effects (CosIng, ECHA dossiers, EWG).
How does VeriMom score methylchloroisothiazolinone?
VeriMom scores methylchloroisothiazolinone at 93/100 (no known risks) based on EU CosIng status, ECHA hazard classifications, and peer-reviewed PubMed studies. Our scoring pipeline is fully transparent.
What are pregnancy-safe alternatives to methylchloroisothiazolinone?
See our curated list of pregnancy-safe alternatives to methylchloroisothiazolinone based on similar function and a no-known-risks safety band.

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Medical Disclaimer

This information is for educational purposes only and does not constitute medical advice. Safety scores are based on publicly available data and may not reflect all risks. Always consult your healthcare provider before using any product during pregnancy or breastfeeding.

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