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Kelp
Kelp
Low concern
Kelp is a whole sea vegetable that is a rich natural source of iodine. While dietary iodine is essential, kelp's iodine content can vary widely and excessive intake may disrupt thyroid function.
Found in
937 products
What it is
Large brown seaweed (Laminariales) used as a whole food and natural source of iodine.
Mineral/iodine source, flavoring (umami), and thickener.
Why it's flagged
- high iodine variability
- potential thyroid disruption with excess intake
What regulators actually say
"High intakes of iodine can cause some of the same symptoms as iodine deficiency—including goiter, elevated TSH levels, and hypothyroidism."
Regulatory status
United States — FDA
GRAS as a food
European Union — EFSA
Permitted as food; tolerable upper iodine intake levels apply
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