Potassium Iodide
Iodine is an essential mineral required for thyroid hormone synthesis; iodization has effectively prevented goiter and developmental iodine deficiency. NIH UL is 1,100 µg/day for adults; chronic excess can cause thyroid dysfunction.
What it is
Inorganic salt (KI) used to iodize salt and fortify foods; provides bioavailable iodine.
Nutrient fortificant — adds essential mineral iodine.
Why it's flagged
- chronic high intake can cause thyroid dysfunction
What regulators actually say
"Iodine is a trace element that is naturally present in some foods, is added to some types of salt, and is available as a dietary supplement. Iodine is an essential component of the thyroid hormones."
"Potassium iodide. The ingredient is used as a nutrient supplement... and is generally recognized as safe."
Regulatory status
United States — FDA
GRAS (21 CFR 184.1634) for use in iodizing table salt and as a nutrient.
European Union — EFSA
Authorized as a source of iodine; UL 600 µg/day adults (EFSA NDA Panel, 2006).
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