Is iodine Kosher? Is iodine found in Kosher marked foods?

Okay, Google is being useless and I’m not entirely sure if I should mark this as Halacha or Recipe or what–… but I just found out that I have thyroid cancer, and one of the parts of treatment involves a LID with no iodine. I know that Kosher salt is non-iodinized. But, are marked Kosher foods also iodine-free? I don’t belong to a local synagogue to just ask a rabbi, so here seemed a safe bet to ask– hopefully someone knows! Thanks!