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Copper itself is a comparatively weak skin sensitizer a 2014 review (PMID 25098945) reported positive copper patch-test reactions in roughly 3.8% of tested subjects so contact allergy is possible but uncommon

Clarkson, A.N., B.A

Anyone interested in the regulatory outcome should monitor the FDA's formal rulemaking process, which must follow the advisory committee recommendation before any change takes legal effect

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