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Quick answer: Mercury compounds carries the heavier risk profile. Zinc pyrithione is banned in the EU and allowed in the US; Mercury compounds is banned in the EU and allowed in the US.
| Property | Zinc pyrithione | Mercury compounds |
|---|---|---|
| EU status | Banned | Banned |
| US status | Allowed | Allowed |
| Risk level | medium | high |
| Banned in | European Union | European Union |
| Restricted in | — | — |
| Category | cmr | heavy metal |
| Where it hides | anti-dandruff shampoo, anti-acne products | skin-lightening cream, mascara |
Zinc pyrithione is an antifungal and antibacterial active in dandruff shampoos.
Mercury compounds is mercury and mercury salts used as preservatives and skin lighteners.
Zinc pyrithione: Reclassified as a reproductive toxicant in the EU and banned as a cosmetic preservative in 2022; still a key US OTC dandruff active.
Mercury compounds: Mercury is a potent neurotoxin. Banned in EU cosmetics; the US limits it to trace levels but enforcement gaps allow contaminated imports.
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