Iodine
Iodine is an essential micronutrient. Adequate intake is critical for thyroid function and neurodevelopment in pregnancy.
What it is
An essential trace mineral required for thyroid hormone synthesis; commonly added to salt as potassium iodide or potassium iodate.
Nutritional fortificant; added to iodized salt and some breads/dairy.
Why it's flagged
- excess intake can cause thyroid dysfunction
- deficiency causes goiter and cognitive impairment
What regulators actually say
"Iodine is an essential component of the thyroid hormones thyroxine (T4) and triiodothyronine (T3)."
"Potassium iodide is generally recognized as safe when used in table salt as a source of dietary iodine."
Regulatory status
United States — FDA
GRAS as iodide and iodate salts in salt and food (21 CFR 184.1265, 184.1635).
European Union — EFSA
Approved nutrient source; tolerable upper intake level set at 600 micrograms/day for adults.
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