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DrEnter t1_irgcd8n wrote

Salt fluoridation: https://pubmed.ncbi.nlm.nih.gov/24308394/

The water thing is a couple of things that I think I was confusing. Iodine is a normal part of drinking water treatment (almost all municipal drinking water is iodized to some extent), but iodizing enough for supplementary reasons is mostly used in areas where iodizing other things is impractical or more difficult. Incidentally, iodized flour is also a thing sometimes used. https://awwa.onlinelibrary.wiley.com/doi/abs/10.1002/j.1551-8833.1927.tb12646.x and https://www.sciencedirect.com/science/article/pii/S0278691515000939

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