Ultra-processing markers
Azodicarbonamide (ADA)
Definition
What it is
Azodicarbonamide (ADA): flour improver used in US commercial bread; banned as a food additive in the EU, Australia, and New Zealand; the WHO has raised concerns about its decomposition product semicarbazide (SEM), a potential carcinogen.
On the label
How it appears on labels
- azodicarbonamide
- ada
- e927a
Regulation
Regulatory status
- Australia/NZ Banned
- Brazil Banned
- European Union Banned
- United Kingdom Banned
Explainer
In plain language
Azodicarbonamide, often shortened to ADA, is a synthetic chemical used in the US as a flour improver and dough conditioner. It helps bread dough rise higher and hold a consistent texture, so commercial loaves and buns come out uniform. The same compound is also used industrially to make foamed plastics, which is why it drew public attention when people noticed it in food.
Assessment
Why it is flagged
The concern centers on what ADA breaks down into during baking. The World Health Organization has noted that ADA can form semicarbazide (SEM), a compound that showed carcinogenic effects in some animal studies, and it also raises questions about respiratory sensitization in workers who handle the raw powder. The EU, Australia, and New Zealand do not permit ADA as a food additive, while the FDA allows it up to 45 parts per million in flour. That gap between major regulators is why Clear Label treats it as a high-severity marker. The human dietary evidence is limited, so the honest picture is a permitted additive in the US that several other jurisdictions have chosen to exclude.
In the aisle
Where it commonly shows up
- Commercial sandwich bread and buns
- Packaged hamburger and hot dog rolls
- Bagels and rolls from large bakeries
- Some fast-food breads
- Packaged flatbreads and wraps
Practical
Reading the label
On US labels it appears as azodicarbonamide, sometimes near flour or as a dough conditioner. It is not always listed if it is used at the mill level, so breads from smaller bakeries or labeled 'no dough conditioners' are one way people sidestep it. In the EU it would be E927a, but it is not authorized there.
Alternatives
If you want to avoid it
Some people choose breads with short ingredient lists that name only flour, water, yeast, and salt, or bakery loaves that state they use no dough conditioners. Many brands reformulated away from ADA in the 2010s, so labels vary by product.
FAQ
Common questions
Is azodicarbonamide banned in the US?
No. The FDA permits ADA in flour and dough at up to 45 parts per million. It is the EU, Australia, and New Zealand that do not allow it as a food additive.
Why is it called the 'yoga mat chemical'?
ADA is also used to make foamed plastics like yoga mats and shoe soles, and that overlap became a talking point during a 2014 campaign to remove it from bread. The same compound being used in both settings does not by itself establish dietary harm, but it is why the additive got public scrutiny.
What is semicarbazide?
Semicarbazide (SEM) is a breakdown product that can form when ADA is heated during baking. It showed carcinogenic effects in some animal studies, which is part of why the WHO flagged it, though the levels formed in bread are small and human evidence is limited.
Citations
Sources
Citation
Primary reference
About this page: the definition, label names, severity, and regulatory chips come from the clearlabel ingredient taxonomy, the same data the scanner uses to score products. Research summaries describe associations reported in published studies, not diagnoses; individual responses vary. Scan any product with clearlabel to see which of its ingredients carry flags.