Azodicarbonamide

Additive

Azodicarbonamide is a flour treatment agent used to help whiten flour and improve dough handling. It breaks down during breadmaking, forming other compounds. Its use in bread is distinct from handling the powder at work or using it in plastic production.

Also known as

azodicarbonamide · azobisformamide · diazenedicarboxamide

Why PRūF tracks it

Concern centers on breakdown products and incomplete current exposure evidence, while animal findings do not establish harm from ordinary bread intake and FDA has begun an updated safety assessment.

Read the research

Azodicarbonamide changes during breadmaking, so its breakdown products are central to dietary safety. One is semicarbazide, which has caused bone, cartilage and other effects in animal experiments at doses above estimated food exposure. Cancer findings are mixed across animal studies: an older female-mouse finding contrasts with a later two-year rat study that found no increased tumors. These studies do not show that eating treated bread causes cancer in people.

Small amounts of ethyl carbamate can also form, depending on the recipe and processing. FDA previously concluded that permitted uses were safe, drawing on bread testing and estimated intake; it began a new assessment in 2026 and requested updated exposure and safety information. The reassessment is still distinct from a decision to prohibit use. Texas and Louisiana have enacted restrictions for specified school meals, with different start dates and exceptions.

International recommendations have also changed, but they do not automatically change domestic law. The remaining concern is uncertainty about breakdown-product exposure and its long-term significance, rather than established harm from an ordinary serving.

Research reviewed on September 5, 2026 · 12 sources