By yourNEWS Media Newsroom
WASHINGTON — Potassium bromate, a chemical additive used to strengthen dough in bread, rolls and other baked goods, remains legal under federal food regulations despite cancer concerns that have prompted restrictions in other countries and a growing movement among U.S. states to eliminate it from food products.
The compound has been classified as possibly carcinogenic to humans by the World Health Organization’s International Agency for Research on Cancer (IARC), based on laboratory evidence linking exposure to tumors in experimental animals.
California will prohibit foods containing potassium bromate beginning Jan. 1, 2027, under legislation enacted in 2023. The approaching deadline is increasing pressure on food manufacturers to reformulate products as the U.S. Food and Drug Administration continues reviewing the additive’s safety.
According to the FDA’s food ingredient database, potassium bromate functions as a dough strengthener, flour treatment agent and oxidizing agent. It improves the elasticity and stability of dough, helping baked products rise more consistently and maintain their shape during commercial production.
The chemical has been used by commercial bakeries for decades, particularly in bread and other yeast-raised products. It can be found in some commercially prepared breads, rolls, pizza crusts and other flour-based foods, although many manufacturers have already adopted alternatives.
Under federal regulations governing bromated flour, manufacturers may add potassium bromate at concentrations not exceeding 50 parts per million in finished bromated flour. Separate rules permit up to 75 parts per million in bromated whole wheat flour.
The FDA also permits potassium bromate in certain standardized bread products, subject to specific limits and manufacturing requirements.
These regulatory allowances have remained in place even as other jurisdictions have restricted or prohibited the additive over concerns about its possible carcinogenic effects.
The primary scientific concern involves what happens when potassium bromate enters the body. Research has shown that the chemical can cause oxidative damage to DNA and increase tumor development in laboratory animals under certain exposure conditions.
In a 1999 scientific evaluation, IARC classified potassium bromate as a Group 2B carcinogen, meaning it is possibly carcinogenic to humans.
The classification reflected sufficient evidence of carcinogenicity in experimental animals but inadequate evidence in humans.
Animal studies have linked potassium bromate exposure to kidney tumors, thyroid tumors and mesotheliomas affecting the abdominal lining. Researchers have also identified evidence of DNA damage associated with its chemical activity.
The National Institutes of Health’s PubChem database summarizes these findings and identifies the chemical’s potential to cause oxidative damage and other toxic effects.
However, the distinction between animal studies and demonstrated human cancer risk remains important.
Research has not established that consuming ordinary amounts of baked goods containing potassium bromate causes cancer in humans. Much of the evidence underlying its carcinogen classification comes from laboratory experiments involving exposure conditions that may differ substantially from normal dietary consumption.
Nevertheless, the findings have prompted regulators and public health advocates to question whether continued use of the additive is necessary, particularly when alternative dough conditioners are available.
Potassium bromate is intended to react during baking, converting into potassium bromide, a different chemical compound.
When the baking process works as intended, little or no potassium bromate should remain in the finished product.
However, incomplete conversion can leave residual bromate in baked goods, depending on the quantity used, the recipe and the baking conditions.
That possibility has become a central concern for regulators because the chemical’s potential carcinogenic properties are associated with exposure to bromate itself.
The FDA has previously worked with commercial baking organizations to improve processing methods and testing procedures intended to minimize residual bromate.
The agency is also continuing a post-market safety review of the chemical.
According to the FDA’s updated list of food chemicals under review, potassium bromate remains in the preliminary information-review stage of the agency’s reassessment process.
The review began in March 2024 and has not yet produced a federal prohibition.
The FDA has explained that its post-market assessments examine existing toxicological findings, dietary exposure, scientific uncertainty and whether new evidence warrants regulatory action.
Possible outcomes include revised safety requirements, restrictions on permitted uses, voluntary industry changes or withdrawal of authorization.
California has already moved to eliminate the additive from its food supply.
The California Food Safety Act, signed by Gov. Gavin Newsom in October 2023, prohibits the manufacture, sale, delivery and distribution of food containing potassium bromate beginning Jan. 1, 2027.
The legislation also restricts brominated vegetable oil, propylparaben and Red Dye No. 3.
Under California Health and Safety Code Section 109025, violations can result in civil penalties of up to $5,000 for a first offense and $10,000 for subsequent violations.
The law applies to food products sold in California, including those manufactured outside the state.
Consequently, national food companies selling baked goods in California must ensure that affected products comply with the new requirements.
Some manufacturers may decide to reformulate products nationwide rather than maintain separate ingredient formulations for California and other states.
When Newsom signed the legislation, he emphasized that food companies would have more than three years to adjust their manufacturing processes.
The governor also pointed to the availability of products manufactured for international markets where certain additives are already restricted.
Other states have considered similar action, although their proposals differ in scope and implementation dates.
Lawmakers in Illinois, New York, Washington and several other states have introduced measures addressing potassium bromate and other food additives.
An October 2026 review by the Environmental Working Group documented numerous state legislative proposals aimed at restricting chemicals in commercially prepared foods.
Some proposals would prohibit the sale of products containing potassium bromate, while others would specifically restrict ingredients used in school meals or foods marketed to children.
The measures reflect growing interest among state lawmakers in reviewing food additives that remain federally authorized but face restrictions elsewhere.
Internationally, potassium bromate has been prohibited as a food additive in the European Union, the United Kingdom and Canada, among other jurisdictions.
Those restrictions are frequently cited by advocates who argue that American consumers should receive similar protections.
The differences among countries reflect varying regulatory approaches to uncertainty, acceptable exposure levels and the availability of alternative ingredients.
In the United States, the FDA generally evaluates whether permitted uses of a food additive meet federal safety standards, considering exposure levels and scientific evidence.
Other jurisdictions have adopted more restrictive approaches to chemicals that exhibit carcinogenic properties in animal testing.
The regulatory disagreement does not necessarily indicate that all foods containing potassium bromate pose the same level of risk. Exposure depends on the amount added during manufacturing, how thoroughly the chemical reacts during baking and whether measurable residues remain.
For consumers, the most direct way to identify the additive is to examine ingredient labels on packaged bread and other baked products.
Potassium bromate may appear by its chemical name, while flour treated with the compound may be identified as bromated flour.
Products labeled as unbromated flour or made without potassium bromate offer alternatives for consumers seeking to avoid the substance.
Commercial bakeries can also use other ingredients and processing methods, including ascorbic acid, commonly known as vitamin C, to improve dough strength and consistency.
The existence of alternatives has become an important element of the debate because potassium bromate is not considered essential to bread production.
Many major bakeries have already moved away from its use, demonstrating that commercial bread can be produced without the additive.
Still, removing the chemical from all products can require adjustments to recipes, production equipment, fermentation methods and baking conditions.
Food manufacturers may also face additional testing and compliance expenses as states implement different restrictions.
The broader controversy comes amid increasing scrutiny of food additives and the FDA’s process for reassessing chemicals that were authorized decades ago.
Regulators face questions about how quickly older safety determinations should be revisited and whether existing standards adequately account for research that emerged after additives were first approved.
For potassium bromate, the central scientific concern remains its demonstrated carcinogenic effects in experimental animals and uncertainty about the potential consequences of long-term human exposure.
The findings do not establish that eating bread containing potassium bromate will cause cancer, but they provide a basis for continued scientific review and precautionary restrictions.
With California’s prohibition approaching and federal regulators still examining the evidence, potassium bromate has become a prominent example of the differences between American food additive regulations and standards adopted internationally.
The next major regulatory milestone is Jan. 1, 2027, when California’s restrictions take effect, potentially accelerating the removal of potassium bromate from commercially produced baked goods sold throughout the United States.
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