Azodicarbonamide (ACA) chemical that forms bubbles in foams and plastics like vinyl, is used to bleach and leaven dough and has been linked to cancer in lab animals.
Potassium bromate , a potent oxidizer that helps bread rise, has been linked to kidney and thyroid cancers in rodents.
“The system for ensuring that ingredients added to food are safe is broken”
The reason data is scarce on this topic is because the industry can self-determine if chemical additives are safe.
U.S. is full of toxic bread, with hybrid grains loaded with gluten, and using leavening methods reliant on chemicals instead of natural bacteria.
These ingredients of ACA and PB are banned in Europe, and even China... Brazil.
TOXIC AMERICA
https://www.theguardian.com/us-news/2019/may/28/bread-additives-chemicals-us-toxic-america