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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; Calcium Disodium EDTA is — in the EU and — in the US.
| Property | Mercury compounds | Calcium Disodium EDTA |
|---|---|---|
| EU status | Banned | — |
| US status | Allowed | — |
| Risk level | high | — |
| Banned in | European Union | — |
| Restricted in | — | European Union (restricted to specific food categories; not approved for many applications permitted in US) |
| Category | heavy metal | additive |
| Where it hides | skin-lightening cream, mascara | — |
Mercury compounds is mercury and mercury salts used as preservatives and skin lighteners.
Calcium disodium EDTA (ethylenediaminetetraacetate) is a chelating agent used as a food preservative. It binds metal ions (particularly iron and copper) that would otherwise catalyze oxidative and color-degradation reactions in foods. It prevents color loss, flavor changes, and bacterial growth in certain foods.
Mercury compounds: Mercury is a potent neurotoxin. Banned in EU cosmetics; the US limits it to trace levels but enforcement gaps allow contaminated imports.
Calcium Disodium EDTA: EDTA chelates essential minerals including zinc, iron, calcium, and magnesium in the gut, potentially reducing absorption of these nutrients with regular consumption. Animal studies at high doses show reproductive toxicity and zinc deficiency effects. EFSA's safety assessment noted that EDTA could reduce zinc bioavailability at consumption levels that could be reached by high consumers of EDTA-containing foods. The ADI is 1.9 mg/kg body weight. EDTA's poor biodegradability also makes it an environmental concern — it accumulates in water supplies and can mobilize heavy metals in sediments.
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