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Quick answer: Mercury compounds carries the heavier risk profile. Mercury compounds is banned in the EU and allowed in the US; Propyl Gallate is — in the EU and — in the US.
| Property | Mercury compounds | Propyl Gallate |
|---|---|---|
| EU status | Banned | — |
| US status | Allowed | — |
| Risk level | high | — |
| Banned in | European Union | Japan (banned for food use) |
| Restricted in | — | European Union (restricted to 200 mg/kg in specific fat/oil applications), United Kingdom, Australia |
| Category | heavy metal | additive |
| Where it hides | skin-lightening cream, mascara | — |
Mercury compounds is mercury and mercury salts used as preservatives and skin lighteners.
Propyl gallate is a synthetic antioxidant preservative derived from gallic acid and propanol. It prevents oxidation of fats and oils, extending shelf life of fat-containing foods. It is often used in combination with BHA and BHT for synergistic antioxidant effect. Chemical formula: C10H12O5.
Mercury compounds: Mercury is a potent neurotoxin. Banned in EU cosmetics; the US limits it to trace levels but enforcement gaps allow contaminated imports.
Propyl Gallate: Animal studies have shown propyl gallate may cause liver damage at high doses. Concerns about estrogenic activity have been raised — some studies suggest propyl gallate may weakly mimic estrogen. Contact dermatitis and allergic reactions are documented in both food and cosmetic applications. Japan banned propyl gallate for food use as part of its precautionary approach to synthetic food preservatives. NTP bioassays found dose-dependent liver effects. EFSA's re-evaluation set an ADI of 0.1 mg/kg body weight — one of the lowest ADIs for food additives, reflecting toxicological concern.
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