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Quick answer: Hydroquinone carries the heavier risk profile. Calcium Disodium EDTA is — in the EU and — in the US; Hydroquinone is banned in the EU and allowed in the US.
| Property | Calcium Disodium EDTA | Hydroquinone |
|---|---|---|
| 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 | additive | cmr |
| Where it hides | — | skin-lightening cream, dark-spot corrector |
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.
Hydroquinone is a skin-lightening agent that inhibits melanin production.
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.
Hydroquinone: Linked to ochronosis and possible carcinogenicity. Banned in EU cosmetics; sold over-the-counter in the US up to 2%.
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