Calcium bromate
A flour treatment agent that IARC classes as possibly carcinogenic to humans. Not permitted in the EU; still allowed in some countries.
- Category
- Flour treatment agents
- Vegan
- Yes
- Vegetarian
- Yes
What it is
A powerful flour bleaching or oxidizing agent used to artificially age and whiten flour.
How it is used in food
Forces flour to instantly 'mature' and turn pure white, allowing bakeries to skip the natural aging process.
Commonly found in- Commercial bread (in permitted countries)
Health and safety
Caused kidney and thyroid tumours in animal studies, which is why IARC places it in Group 2B, possibly carcinogenic to humans. Most of it breaks down during baking, but residues can remain.
Evaluated by food safety authorities and determined to be unsafe for general food use.
Regulatory status
| Region | Status | Notes |
|---|---|---|
| Australia & New Zealand FSANZ |
Not approved | Not approved for general food use or historically banned due to safety concerns. |
| 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) |
Not approved | Not approved for general food use or historically banned due to safety concerns. |
Identification on labels
- E-number
- E924b
Worth knowing
Potassium bromate (E924) is still legally permitted in the United States and is a common ingredient in some American fast-food buns.
Conclusion
A highly dangerous, banned dough conditioner.
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Open the appEntry last reviewed 2026-08-05.
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