only the US allows potassium bromate in bread. It is banned in Europe, China, and India but not the US

it is a category 2B carcinogen by the International Agency for Research on Cancer

list of other "foods" with KBr

https://www.ewg.org/foodscores/ingredients/8173-PotassiumBromate/search/?page=7&per_page=12&type=products

cbs reporting here https://www.cbsnews.com/news/us-food-additives-banned-europe-making-americans-sick-expert-says/