Potassium Bromate: FDA Status, State Bans & Global Regulatory Outlook

What Is Potassium Bromate?

Potassium bromate (KBrO₃, CAS 7758-01-2, UNII: 04MB35W6ZA) is an inorganic oxidizing agent used as a flour improver and dough conditioner in commercial baking. When added to flour or dough, it strengthens the gluten network by oxidizing sulfhydryl groups in gluten proteins, producing bread with greater volume, finer crumb structure, and improved elasticity. It was first patented for use in baking in 1914 and has been a staple of American commercial bread production for over a century.

Potassium bromate appears on ingredient labels as "potassium bromate" or as part of "bromated flour." It is designated E924 internationally, though that designation is largely historical — the substance has been banned across most of the developed world. The United States remains one of the few major economies where its use in food is still permitted.

FDA Regulatory Status

Potassium bromate is permitted as a food additive in the United States under two regulatory pathways: 21 CFR 172.730 (food additive authorization for malting barley) and 21 CFR Part 136 (optional ingredient in standardized bakery products). Its regulatory status predates the Food Additive Amendments of 1958 — as a substance in common use prior to that date, it was treated as prior-sanctioned rather than subjected to the full safety review process required of new additives.

Permitted Uses and Limits

Under 21 CFR 136.110(c)(14), potassium bromate may be used as a dough conditioner in bread, rolls, and buns at a maximum level of 0.0075 parts per 100 parts flour by weight (75 ppm). This limit applies to the total combined amount of potassium bromate, calcium bromate, potassium iodate, calcium iodate, and calcium peroxide. Bromated flour is also an acceptable optional ingredient under 21 CFR 136.110(c)(1), and bromate use in whole wheat bread is addressed in 21 CFR 136.180(a)(1).

The FDA's regulatory position has been that when used according to good manufacturing practice, potassium bromate is fully converted to potassium bromide (a harmless salt) during the baking process. This assumption underpins the agency's continued permissiveness. However, independent laboratory testing has repeatedly demonstrated that residual bromate persists in finished baked goods, particularly when baking times or temperatures are insufficient for complete conversion.

FDA Review Status

The FDA initiated a formal review of potassium bromate on March 4, 2024, placing it on the agency's List of Select Chemicals in the Food Supply Under FDA Review. As of March 2026, the review remains in the "Review of Information" phase. The comment period has closed.

Rather than pursuing regulatory prohibition, the FDA has historically taken a collaborative approach — working with the American Bakers Association to encourage industry to improve baking technology and testing so that bromate is used in ways that minimize residual levels. This voluntary, industry-led strategy stands in sharp contrast to the outright bans adopted by virtually every other major regulatory authority worldwide.

The FDA has not formally revoked the GRAS status of potassium bromate or initiated rulemaking to remove it from 21 CFR 136.

Health Concerns and IARC Classification

The International Agency for Research on Cancer (IARC) classified potassium bromate as Group 2B — possibly carcinogenic to humans — in Volume 73 of the IARC Monographs (1999), part of the evaluation of "Some Chemicals that Cause Tumours of the Kidney or Urinary Bladder in Rodents and Some Other Substances." The classification was based on sufficient evidence of carcinogenicity in experimental animals but inadequate evidence in humans.

Animal studies have consistently demonstrated that potassium bromate induces:

• Renal cell tumors (kidney cancer) in rats
• Thyroid follicular cell tumors in rats
• Peritoneal mesothelioma in male rats

Beyond carcinogenicity, research has linked bromate exposure to reproductive toxicity, oxidative stress and DNA damage, and hearing loss (through cochlear damage). A comprehensive review by US Right to Know documented over 50 years of research establishing these risks.

The fundamental tension in US regulation is that the FDA acknowledges the IARC classification and the animal evidence, yet maintains that proper baking eliminates residual bromate — a position contradicted by analytical testing and rejected by regulators in Europe, Canada, China, India, Brazil, and dozens of other countries.

International Regulatory Landscape

Potassium bromate has been banned as a food additive in most major economies. The United States is a conspicuous outlier.

Jurisdiction	Action	Year
European Union	Banned in food	1990
United Kingdom	Banned in food	1990
Canada	Banned as food additive	1994
Brazil	Banned in food	2001 (LEI No 10.273/2001)
China	Banned in food	2005
India	Banned by FSSAI in bread and bakery products	2016
Argentina	Banned in food	—
Nigeria	Banned in food	—
South Korea	Banned in food	—
Peru	Banned in food	—
Sri Lanka	Banned in food	—
Codex Alimentarius	Withdrew specifications	2012

The Codex Alimentarius withdrawal is particularly significant. Codex sets international food safety standards referenced by the World Trade Organization. Its decision to formally withdraw potassium bromate specifications in 2012 signaled a global scientific consensus that the substance should not be used in food — a consensus the United States has declined to follow.

The EU ban dates to 1990, meaning European bakers have operated without potassium bromate for over 35 years with no loss of product quality. This undermines the US industry argument that bromate is technologically necessary.

California AB 418 and State-Level Bans

California Food Safety Act (AB 418)

On October 7, 2023, Governor Gavin Newsom signed the California Food Safety Act (AB 418, Chapter 328), making California the first US state to ban potassium bromate in all food products. The law prohibits the manufacture, sale, delivery, distribution, holding, or offering for sale of any food containing potassium bromate, effective January 1, 2027.

AB 418 bans four substances total: potassium bromate, brominated vegetable oil, propylparaben, and Red Dye No. 3. Violations carry civil penalties of up to $5,000 for a first offense and up to $10,000 for each subsequent violation, enforceable by the Attorney General or local law enforcement.

Other State Activity

California's legislation triggered a wave of state-level action. As of early 2026, at least 30 states have considered bills limiting food additives, with several specifically targeting potassium bromate:

Enacted laws (school food):

• Utah (HB 402) — Effective May 7, 2025. Prohibits schools from selling or serving food containing potassium bromate.

• Arizona (HB 2164) — Effective for the 2026-2027 school year. Prohibits schools from providing food containing potassium bromate.

• New York — The Food Safety and Chemical Disclosure Act passed the State Senate (as of June 2025) and includes potassium bromate among banned substances. Also requires companies to demonstrate safety of GRAS-exempt chemicals.

• Illinois (SB 93) — Statewide ban on food containing potassium bromate; in second legislative chamber.

• Arkansas (SB 9) — Statewide ban; moved beyond first chamber.

• Maryland (HB 1208) — Statewide ban; moved beyond first chamber.

West Virginia's HB 2354 (signed March 2025) — the strongest state food additive law to date — bans seven synthetic dyes, BHA, and propylparaben but does not include potassium bromate. (Note: a federal judge issued a preliminary injunction in December 2025 blocking the retail provisions of HB 2354; the school meals ban remains in effect.)

Federal Legislative Activity

Food Chemical Reassessment Act of 2025 (H.R. 4306)

Representatives Jan Schakowsky (D-IL) and Rosa DeLauro (D-CT) introduced the Food Chemical Reassessment Act of 2025 (H.R. 4306), which would require the FDA to systematically reassess the safety of food chemicals — including GRAS substances — at least every three years beginning in 2026.

Under the earlier 2023 version of the bill (H.R. 3927), potassium bromate was one of ten substances specifically named for priority reassessment. The 2025 version (H.R. 4306) grants the Secretary discretion to select the first ten substances for reassessment, though potassium bromate is widely expected to be among them given its inclusion in the earlier bill and its prominence in food safety advocacy. The bill is endorsed by CSPI, Consumer Reports, EWG, the Environmental Defense Fund, and Food and Water Watch.

The legislation directly targets the GRAS loophole — the mechanism by which potassium bromate and hundreds of other pre-1958 substances have avoided modern safety review for decades.

MAHA Executive Order

On February 13, 2025, President Trump signed Executive Order 14212, establishing the Make America Healthy Again (MAHA) Commission. The Commission's Assessment ("Make Our Children Healthy Again"), issued May 22, 2025, highlighted children's exposure to environmental chemicals and ultra-processed foods as drivers of chronic disease.

The MAHA initiative has created political momentum across party lines for food chemical reform. The FDA's existing review of potassium bromate — initiated in March 2024 — now sits within a broader federal push to reassess legacy food additives, though no concrete enforcement timeline for bromate has emerged.

Affected Product Categories

Potassium bromate is used almost exclusively in baked goods as a flour treatment agent. It appears as an ingredient in more than 200 products currently on the US market. Affected categories include:

• Commercial white bread — the primary use case; bromated flour is standard in many mass-market bread formulations
• Rolls, buns, and hamburger buns — high-volume commercial bakery products
• Pizza dough — both retail and foodservice
• Flour tortillas — some commercial brands
• Bromated flour — sold as an ingredient to commercial and retail bakeries
• Crackers and snack products — where flour strength affects texture
• Frozen dough products — where bromate's slow-acting oxidation is valued

Products typically list either "potassium bromate" or "bromated flour" in their ingredients. In practice, many major brands have already voluntarily removed bromate in response to consumer pressure and international reformulation requirements for export markets.

Industry Reformulation

The technical case for potassium bromate's necessity has weakened considerably. Ascorbic acid (vitamin C) is the most widely adopted replacement, functioning as an oxidizing agent that strengthens gluten networks in a manner comparable to bromate. Research published in the International Journal of Science for Global Sustainability confirmed that ascorbic acid produces bread of equivalent quality without carcinogenicity concerns.

Key alternatives include:

• Ascorbic acid (vitamin C) — most common direct replacement; functions as a slow-acting oxidant when combined with food acids like citric acid
• Azodicarbonamide (ADA) — another dough conditioner, though itself controversial and banned in the EU and Australia
• Enzyme-based systems — hemicellulases, glutathione oxidase, and exo-peptidases that improve dough strength, volume, and flavor
• Enzyme-ascorbic acid blends — often outperform single-ingredient replacements

The European baking industry has operated without potassium bromate since 1990 with no meaningful quality loss, demonstrating that reformulation is both technically feasible and commercially viable at scale. Many US manufacturers — including major national brands — have already reformulated, driven by export requirements (products containing bromate cannot be sold in the EU, Canada, or most international markets) and consumer demand for cleaner labels.

Compliance Outlook

The regulatory trajectory for potassium bromate in the United States points toward eventual prohibition, but the timeline remains uncertain.

Near-term (2027): California's AB 418 creates a hard deadline on January 1, 2027. Any company selling food products containing potassium bromate in California after that date faces civil penalties. Given California's market size (the world's fifth-largest economy), this effectively forces national reformulation for most manufacturers.

Medium-term (2026-2028): New York, Illinois, Arkansas, and Maryland are advancing statewide bans. If enacted, the patchwork of state laws will further compress the economic case for continued bromate use. School food bans in Utah and Arizona signal bipartisan concern.

Federal level: The FDA's ongoing review (initiated March 2024) has not produced a timeline for action. The Food Chemical Reassessment Act (H.R. 4306) would force systematic reassessment but has not advanced to a vote. The MAHA initiative provides political tailwinds but no binding mechanism.

Bottom line for compliance teams: Companies still using potassium bromate should be reformulating now. The California deadline is 10 months away, multiple other states are close behind, and the substance has been banned in virtually every other major market. The question is not whether bromate will be removed from the US food supply, but whether individual companies act proactively or are forced to scramble under deadline pressure.