Potassium iodate
Potassium iodate is an older oxidizing flour treatment agent. U.S. rules allow it only for bread at up to 0.0075% of flour weight, and Canada permits it in bread and unstandardized bakery products at 45 ppm of flour. It is also recognized internationally as INS 917 and can serve as a stable iodine source in iodized salt, a different use from strengthening dough. The main health question is dose control: iodate is largely converted to iodide, so the relevant biology is usually iodine intake and thyroid response, not a bromate-like cancer signal. Too much iodine can push susceptible people toward hypo- or hyperthyroidism, especially people with thyroid disease, iodine-deficient populations, older adults, fetuses, newborns, and some pregnant or lactating people. At regulated bread-use levels, evidence for direct human harm is limited; JECFA nevertheless says potassium iodate is not recommended for flour treatment while continuing to recognize iodate and iodide as iodine sources. Regulatory approaches differ: the U.S. and Canada allow narrow uses, while current EU/UK approved-additive lists do not include it for food-additive use.
- Concern
- High
- Function
- Dough Conditioners
- Updated
- May 25, 2026
What this is
Potassium iodate is an older oxidizing flour treatment agent. U.S. rules allow it only for bread at up to 0.0075% of flour weight, and Canada permits it in bread and unstandardized bakery products at 45 ppm of flour. It is also recognized internationally as INS 917 and can serve as a stable iodine source in iodized salt, a different use from strengthening dough. The main health question is dose control: iodate is largely converted to iodide, so the relevant biology is usually iodine intake and thyroid response, not a bromate-like cancer signal. Too much iodine can push susceptible people toward hypo- or hyperthyroidism, especially people with thyroid disease, iodine-deficient populations, older adults, fetuses, newborns, and some pregnant or lactating people. At regulated bread-use levels, evidence for direct human harm is limited; JECFA nevertheless says potassium iodate is not recommended for flour treatment while continuing to recognize iodate and iodide as iodine sources. Regulatory approaches differ: the U.S. and Canada allow narrow uses, while current EU/UK approved-additive lists do not include it for food-additive use.
Safety Review
The critical endpoints experts review in safety assessments. This is not a prediction of harm.
The main concern is not a proven bromate-like cancer risk; available reviews indicate potassium iodate is largely reduced to iodide after ingestion, and small oral doses used for iodized salt have shown negligible tissue-injury risk. The better-supported concern is iodine exposure: excess iodine can trigger hypothyroidism or hyperthyroidism in susceptible groups, including people with thyroid disease, older adults, fetuses, newborns, and some pregnant or lactating people. Evidence for harm from permitted bread-use levels is limited, but JECFA’s long-standing view is that iodates are not recommended for flour treatment because bread can be a staple and iodine intake is easier to control through fortification programs. The stronger caution mainly reflects broad EU/UK non-authorization for food-additive use, not proof of human injury from occasional exposure.
No safety review endpoints are listed for this ingredient yet.
Restaurant Usage
1 linked ingredient reports
State Policies
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No current state policy is listed for this ingredient in the policy tracker.
Federal Policies
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No direct federal policy is linked to this ingredient right now.
Sources
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Source population is still pending for this dossier. The page stays visible because the restaurant and policy context is still useful.