Potassium bromate (E924a): What the Sources Found

Potassium bromate is the additive the food industry lists as E924a. In our table it is high risk: it takes 30 of the 33 additive points off a product's score for a child.

In short

High risk. 30 of the 33 additive points come off a product that carries it.
No child flag. Nothing below is written about children specifically, so the class is the same at every age.
4 citations from IARC, Law, OEHHA, FDA, each one below.

What Potassium bromate does to a score

A packaged food starts with 33 points for what is in its ingredient list. Potassium bromate takes 30 of the 33 additive points off a product's score. Scan the pack in Sito and the score you get is the one for your own child's age, with this additive named in the reasons. How we score has the whole method.

What the sources found

Every classification in our table comes from the citations below, and nothing else. They are quoted as the source wrote them.

IARC Monographs Vol. 73 (1999) — potassium bromate
Group 2B, possibly carcinogenic to humans, on sufficient evidence of renal tumours in experimental animals.
Law California AB 418, the California Food Safety Act (signed 7 Oct 2023), Health & Safety Code
Prohibits the manufacture, sale or distribution of any food containing potassium bromate in California from 1 January 2027 (with Red 3, BVO and propylparaben).
OEHHA Proposition 65 list of chemicals (OEHHA, list current to 31 July 2026) — potassium bromate/bromate, listed as causing cancer 1 January 1990
Listed carcinogen under California Proposition 65.
FDA 21 CFR part 137 (Cereal flours and related products) — bromated flour; FDA post-market chemical review table (2024)
Still federally permitted as an optional flour treatment in the US; FDA lists potassium bromate in 'review of information' status since March 2024.

Why this class

IARC Group 1 or 2A with a dietary exposure route; or EFSA has withdrawn or negated a safety conclusion; or EFSA’s own exposure assessment finds a child age group exceeding the ADI at mean intake; or the substance is banned or formally being phased out for food use by the EU, by the US FDA, or under a US state law.

Our confidence in this row's classification is high. Medium or low does not mean the evidence is weak; it means something about the row is still being pinned down, usually a regulatory status confirmed from one source rather than two.