Ingredient · dataset v56
Methylchloroisothiazolinone and fungal acne
No known trigger
Why it's not a known trigger
The chlorinated partner of MI in MCI/MI blends; same small-ring chemistry, no fatty substrate.
Almost always used paired with methylisothiazolinone.
Evidence strength
Judged neutral — no trigger evidence
Function
Preservative
Also listed as
MCI, CMIT
Related preservative
- Anisic Acid — No known trigger
- Benzisothiazolinone — No known trigger
- Benzyl Alcohol — No known trigger
- Butylated Hydroxytoluene — No known trigger
- Butylene Glycol Dicaprylate — No known trigger
- Butylparaben — No known trigger
- Caprylhydroxamic Acid — No known trigger
- Chlorhexidine Digluconate — No known trigger
Sources
EU CosIng database — search the INCI name
Last reviewed: 2026-10-13 (dataset v56).
Questions
Does Methylchloroisothiazolinone trigger fungal acne?
No known trigger: The chlorinated partner of MI in MCI/MI blends; same small-ring chemistry, no fatty substrate.
Does Methylchloroisothiazolinone feed Malassezia?
No known link: Methylchloroisothiazolinone is judged with no known trigger. One screened ingredient is not a product verdict — when in doubt, ask a dermatologist.
Is this medical advice?
No. We screen ingredient lists; we never diagnose, treat, or certify products. When in doubt, ask a dermatologist.
Check a full list containing Methylchloroisothiazolinone →
Not medical advice: we screen ingredient lists for potential triggers — we never diagnose, treat, or certify products. Dataset v56.