Where Iodine Comes From, and How Much a Day Calls For
The daily figure that Annex XIII of Regulation (EU) No 1169/2011 lists for iodine comes to 150 µg. It exists so labels stay comparable from one product to the next, and it is not a personally tailored amount.
| Food | Approximate iodine content per serving |
|---|
| Saltwater fish (e.g. cod, haddock) | high |
| Mussels and other seafood | high |
| Iodized table salt | medium to high, depending on use |
| Milk and dairy products | medium |
| Chicken eggs | low to medium |
These figures shift with soil conditions, feed or farming practices, and preparation, so they're meant as a loose indication, not for calculating an exact daily amount. A daily diet that rotates through several of these foods usually reaches the reference value through that alone.
Where Iodine Travels in the Body
After absorption in the small intestine, iodine enters the bloodstream. A substantial part of it settles in a single organ in the neck, where it becomes part of the body's own messenger substances. These messenger substances leave the organ only when needed and reach practically every cell in the body through the blood, including nerve tissue. Any surplus the body doesn't need leaves it mostly through urine.
“Iodine contributes to normal cognitive function.”
EU-authorized wording · Regulation (EU) No 432/2012.
The official wording itself names neither that organ nor any individual messenger substance. The description above provides scientific context only; it supplements the reviewed sentence without being part of it.
How a Sentence Like This Comes to Be
Before wording like the sentence quoted above can be used at all, the European Food Safety Authority (EFSA) assesses the available scientific evidence on a single mineral and a single subject area. Only after that does the European Commission decide whether – and in exactly what wording – this connection gets added to the list of authorized claims.
That wording is then fixed: it may not be expanded or rephrased in spirit, and it stays tied to the one reviewed mineral it refers to.
What the Wording States – and What It Leaves Open
- The sentence doesn't name any single mental capacity or any particular age group within the adult population.
- It describes a process that's typical given an adequate supply, not a gain that would come from an amount beyond the usual requirement.
- It doesn't name any single organ or any individual messenger substance – the previous chapter only provides scientific background, without being part of the official text.
- It doesn't link iodine to any other body function that has its own, separately reviewed claims.