Is Methylchloroisothiazolinone banned?
Methylchloroisothiazolinone is permitted by the US FDA. Several countries restrict, warning-label, or have reviewed it for safety concerns. The US has more lenient additive rules than the EU, UK, Canada, and Japan, which is why this ingredient remains widely used here.
Why Methylchloroisothiazolinone is flagged
A strong skin sensitizer; the EU bans it in leave-on products and tightly limits rinse-off use. The US is less restrictive.
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