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Seaweed
Seaweed
Low concern
Seaweed is highly variable in iodine content; some species (notably kombu) can deliver doses far exceeding the tolerable upper intake of 1100 µg iodine/day for adults, risking thyroid dysfunction. Nori and wakame are typically lower in iodine.
Found in
1,958 products
What it is
Edible marine macroalgae (e.g., nori, kombu, wakame, dulse).
Whole food / seasoning; provides iodine, fiber, umami flavor.
Why it's flagged
- excess iodine (especially kombu)
- heavy metal accumulation (arsenic, cadmium) varies by species/origin
What regulators actually say
"The FNB has set tolerable upper intake levels (ULs) for iodine... 1,100 mcg for adults. Some seaweed (especially kelp) has very high amounts of iodine."
Regulatory status
United States — FDA
Conventional food (specific species)
European Union — EFSA
Conventional food; iodine UL applies
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