A significant source of declining iodine levels in humans can also be traced to increased bromide found in food and medications. Most notably potassium iodate w

A significant source of declining iodine levels in humans can also be traced to increased bromide found in food and medications. Most notably potassium iodate was used as a bread conditioner until the 1950s when it was substituted for potassium bromate. [0] Excess bromide levels displace the iodide stored in the thyroid and is a contributing factor to the described increase of groiter. Bromide also has the added drawback of increased cancer risk and has now been banned in California [1] [2]. [0] https://pmc.ncbi.nlm.nih.gov/articles/PMC3916868/ https://pmc.ncbi.nlm.nih.gov/articles/PMC3916868/ [1] https://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=202320240AB418&os=.&ref=app https://leginfo.legislature.ca.gov/faces/billNavClient.xhtml... [2] https://web.archive.org/web/20131203041405/http://www.oehha.ca.gov/prop65/CRNR_notices/admin_listing/intent_to_list/noilbromate.html https://web.archive.org/web/20131203041405/http://www.oehha....