Thiabendazole
Not authorised in EU, but permitted in AU-NZ and US. No evidence of harm at dietary intake.
- Category
- Preservatives
- Vegan
- Yes
- Vegetarian
- Yes
What it is
Thiabendazole is a fungicide used on citrus and bananas after harvest — and, at higher doses, a deworming medicine.
How it is used in food
Prevents the moulds that would otherwise spoil citrus and bananas in shipping and storage.
Commonly found in- Post-harvest treatment of citrus and bananas
Health and safety
No known risks at typical dietary levels.
Removed from the EU list of permitted food additives; it is assessed as a plant protection product, with residue limits set for treated fruit.
Regulatory status
| Region | Status | Notes |
|---|---|---|
| Australia & New Zealand FSANZ |
Permitted | Permitted under the FSANZ Food Standards Code. |
| European Union EFSA / European Commission |
Not approved | Not on the EU authorised list of food additives (Annex II). |
| United States FDA (Food and Drug Administration) |
Permitted | Authorised for food use by the FDA (often GRAS for standard additives). |
Identification on labels
- E-number
- E233
Worth knowing
The same molecule is a veterinary and human anthelmintic — it has been used for decades to treat worm infections in livestock and people.
Conclusion
A fungicide; avoid eating treated fruit peels.
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Open the appEntry last reviewed 2026-08-05.
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