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Answer: Yes — Potassium Bromate is banned in 8 countries/regions including European Union, United Kingdom, Canada, China. The FDA still allows it in US food. Risk level: high. Commonly found in: Some commercial breads, Certain flour mixes, Some pizza dough products.
TL;DR: Potassium Bromate is banned in the EU but allowed in the US (food additives).
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Also called KBrO3. (E924) CAS 7758-01-2.
Other names: KBrO3, E924, Bromic acid potassium salt
| EU status | Banned |
|---|---|
| US status | Allowed |
| Risk level | high |
| Where it shows up | Some commercial breads, Certain flour mixes, Some pizza dough products, Some dinner rolls and hamburger buns |
| CAS number | 7758-01-2 |
Potassium bromate (KBrO3) is an oxidizing agent used in commercial bread baking as a flour maturing agent and dough conditioner. It strengthens gluten networks, improves dough elasticity, and produces a more uniform, light-textured baked product. It is a white crystalline powder.
Commercial bakers use potassium bromate because it produces stronger, more elastic dough with better rise, finer crumb structure, and lighter texture. It reduces mixing time and improves consistency in high-volume commercial baking. It is cheaper than alternative dough conditioners.
Potassium bromate is classified by the International Agency for Research on Cancer (IARC) as Group 2B — a possible human carcinogen — based on sufficient evidence in animals. This classification was formalized in 1999. The landmark toxicology study is Kurokawa et al. (1990), published in Environmental Health Perspectives (PMC1567851), which demonstrated that KBrO3 induces renal cell tumors (kidney cancer), mesotheliomas of the peritoneum, and follicular cell tumors of the thyroid in rats. Importantly, the researchers demonstrated KBrO3 is a complete carcinogen — it possesses both tumor-initiating and tumor-promoting activities for renal tumorigenesis. The mechanism of carcinogenicity involves generation of reactive oxygen species, particularly hydroxyl radicals and superoxide radicals. These radicals cause oxidative DNA damage, specifically 8-hydroxydeoxyguanosine (8-OHdG) formation in rat kidney cells — a well-characterized biomarker of oxidative DNA damage. California declared potassium bromate a known carcinogen under Proposition 65 in 1991, requiring cancer warning labels on California products containing it. Multiple advocacy organizations including CSPI (1999 petition) and EWG (2015 petition) have petitioned the FDA for a federal ban. As of 2025, the FDA has urged voluntary industry elimination since the early 1990s but has not issued a formal ban. Nephrotoxicity from high-dose potassium bromate is well documented in case reports of accidental or intentional poisonings: it causes irreversible renal tubular necrosis, permanent deafness (cochlear damage), and blindness (optic nerve damage). These effects occur at doses far above food consumption scenarios but demonstrate the compound's acute toxicological potency. FDA testing in 1999 found residual potassium bromate above expert-recommended safe limits in more than half of 17 tested bread and roll products, demonstrating that the 'it bakes off completely' argument does not always hold in commercial practice.
For educational use only. This page summarizes the regulatory status of Potassium Bromatewith citations to the primary sources below. It is not medical advice. Regulatory status is not the same as a proven health effect — read the cited sources for their exact wording, and consult a doctor for decisions about your or your family's health.
Ascorbic acid (vitamin C) is the primary natural replacement — a dough oxidant that strengthens gluten without carcinogenicity concerns. Enzyme-based dough improvers (fungal amylases, hemicellulases, glucose oxidase) are extensively used in European baking. These alternatives achieve equivalent or better bread quality and are used universally in countries where potassium bromate is banned.
No federal ban exists as of 2025. The FDA urged voluntary industry elimination since the early 1990s but has not issued a formal ban. California declared it a carcinogen under Proposition 65 in 1991. It is banned in the EU, UK, Canada, China, India, Brazil, and many other countries.
Commercial breads, dinner rolls, hamburger and hot dog buns, pizza dough, and flour mixes. Many major US brands (Pepperidge Farm, Arnold, Sara Lee) voluntarily eliminated it. Some regional bakeries and smaller manufacturers still use it. Check labels for 'potassium bromate.'
IARC classifies it as Group 2B (possible human carcinogen) based on animal studies showing kidney tumors, peritoneal mesotheliomas, and thyroid tumors in rats. Mechanism involves reactive oxygen species causing oxidative DNA damage. California lists it as a known carcinogen.
The FDA's risk-based approach requires evidence of harm at realistic human exposure levels. The agency contends that properly baked bread contains minimal residual KBrO3. However, FDA's own 1999 testing found residual levels above safe limits in most tested products. Critics argue the FDA's decades of inaction is a regulatory failure.
It has been used in some US commercial breads for decades but voluntary phase-outs have reduced prevalence. Major commercial brands have eliminated it. More likely in products from smaller regional bakeries. Check labels for 'potassium bromate.'
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Ascorbic acid (vitamin C) is the standard replacement — a dough conditioner that strengthens gluten through oxidation. Enzyme-based dough improvers are also effective. These alternatives are universally used by European bakers.
Acute high-dose poisoning: nausea, vomiting, abdominal pain, diarrhea, irreversible kidney damage, permanent deafness (cochlear hair cell destruction), and blindness (optic nerve damage). Doses required for acute poisoning are far above any food consumption scenario.
Yes. The FDA acknowledged carcinogenicity data by the late 1980s, urged voluntary elimination in the early 1990s. CSPI petitioned for a ban in 1999, EWG in 2015. As of 2025, no federal ban exists. The FDA's continued inaction is frequently cited as an example of US-international regulatory discrepancy.
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