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Quick answer: Coal tar carries the heavier risk profile. Calcium Disodium EDTA is — in the EU and — in the US; Coal tar is banned in the EU and allowed in the US.
| Property | Calcium Disodium EDTA | Coal tar |
|---|---|---|
| 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 | — | anti-dandruff shampoo, hair dye, psoriasis products |
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.
Coal tar is a complex byproduct of coal processing used in dandruff and psoriasis products and dyes.
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.
Coal tar: A known human carcinogen. Restricted in the EU (banned in hair dye); permitted in US OTC products.
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