Potassium bromate is a flour additive used to make bread rise higher and bake faster.
In 1999 the World Health Organization’s cancer research agency (IARC) classified it as a possible human carcinogen after it caused kidney and thyroid tumors in rats.
The European Union banned it in 1990, Canada in 1994, and China and the UK do not allow it either. In the United States the FDA still permits up to 75 parts per million in flour.
The FDA opened a review in March 2024 but has not banned it. The FDA still allows the use of potassium bromate, though many commercial bakers and food companies have voluntarily phased it out due to consumer concerns and the bans in other countries.
The most common alternative used to achieve similar results is ascorbic acid (Vitamin C), which serves as a dough conditioner without the associated carcinogenic risks.
A 2026 EWG review found Potassium Bromate in over 200 products sold in US stores, including flour tortillas, soft pretzels and baked goods.
California passed a law that bans it starting January 1, 2027.
Check the ingredient list on your bread, tortillas, rolls and pizza dough for the words potassium bromate or bromated flour.
