Looking here at a salt packet from ncdonalds. What is sodium sulucoaluminate? Also, dextrose and potassium iodide are present. Why isn’t salt just salt?
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Very cool history on why we fortify salt with iodine (as others have stated, it’s a pretty essential nutrient for humans. Here’s the history of it: [https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3509517/](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3509517/)
TLDR; Not eating iodine messes up our thyroid gland and that really messes up our hormones and inhibits our intelligence and ability to function.
The reason we use salt specifically to distribute iodine is that everyone eats it and it’s pretty easy to guess how much of it people will eat, so we can dose the iodine correctly
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