Methylchloroisothiazolinone
Avoid
Official INCI name
A strong sensitizer, usually paired with MIT. Allowed only in rinse-off products in the EU.
What it does
Preservative. Stops bacteria, yeast and mould growing in the product.
Worth knowing
Can cause contact allergy that, once developed, returns on every exposure.
Also written as
Scans recognise it under every one of these names.
Kathon CGMCIMethylchloroisothiazolinone/Methylisothiazolinone
“Methylchloroisothiazolinone” is its name in the EU glossary of common ingredient names (no. 16610), the names labels in the EU must use. © European Union, EUR-Lex.