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Ascophyllum Nodosum
Ascophyllum Nodosum
Low concern
Ascophyllum nodosum is consumed as food and supplement. Concentrated forms can deliver excessive iodine; long-term high intake may affect thyroid function.
Found in
5 products
What it is
Knotted wrack — a brown seaweed (Ascophyllum nodosum) eaten as food/supplement and used as fertilizer/feed.
Seaweed ingredient/supplement; source of iodine, fiber, and minerals.
Why it's flagged
- high iodine content
- inorganic arsenic content of brown seaweeds
What regulators actually say
"Some types of seaweed (such as kelp) are very high in iodine and can cause an adverse health effect if consumed in excess."
Regulatory status
United States — FDA
Used in foods and supplements; some preparations have GRAS notifications
European Union — EFSA
Traditional food; novel food rules may apply to specific extracts
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