Iodine
What the research shows
Concerning
in studies of people
What research says
Studies in people
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Concern
Thyroid health3
Too much iodine from brown seaweeds can affect the thyroid, and labels may not show how much iodine is in them.
How it’s made and used
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Thyroid gland swelling4
Many older Germans lack iodine, and nearly half of those over 60 had an enlarged thyroid gland.
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Mineral deficiency prevention5
Iodine deficiency can cause health problems, and experts say it needs to be prevented.
The signal at the top counts the findings in people and in animal and lab studies. A concern in studies of people outranks animal and lab studies, and “No concerns” needs at least one finding in people. When most findings in people point one way, the page leans that way (“Mostly”), and every finding is still shown. Findings whose study type is not stated are shown but not counted. This page is a reference, not medical advice. It describes what regulators and published research say. Talk to a doctor or dietitian about your own diet.
Products
The 6 most-scanned of 2,123 products on Open Food Facts that list iodine.
- Croissance réduit en sucre Jaouda · 500 ml 1 additive
- pan de molde / pão de forma clásico / clássico Schär · 300 g 2 additives
- The original oat-ly barista edition oat drink Oatly · 1 l 1 additive
- Tortelloni Ricotta et épinards Baresa · 250 g 3 additives
- Tortelloni Pesto Basilico Toque du Chef · 250 g 4 additives
- Barista edition oat drink Oatly! · 1 l 1 additive
References
- 1iodine: ingredient taxonomy entry. Open Food Facts.
- 2Iodine. Wikipedia. Accessed September 29, 2026. CC BY-SA 4.0.
- 3Smyth PPA. Iodine, Seaweed, and the Thyroid. Eur Thyroid J. 2021;10(2):101-108. doi:10.1159/000512971
- 4Hintze G, Köbberling J. [Dietary iodine deficiency. Its consequences in the aged]. Fortschr Med. 1992;110(10):163-6.
- 5Bodnar PM. [Iodine deficiency disorders--a present medical and social problem]. Lik Sprava. 2001:8-10.