Is Methylisothiazolinone banned?
Methylisothiazolinone 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 Methylisothiazolinone is flagged
A potent contact allergen behind an epidemic of skin allergies. The EU banned it in leave-on products and limits rinse-off use; US use is far less restricted.
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