Yes, some people have reactions because of that. If you are allergic, generally the recommendation is not to take it. You however, can still be protected by building an area in your basement to stay in that uses concrete block, wood, etc to help absorb radiation to prevent it from getting to you. It’s the gamma radiation that you need to stop, alpha and beta will be stopped from your house walls, mostly. Gamma needs to be stopped by denser materials.
Doctor said it was an allergy to iodine. Hives all over and swollen mouth on the inside. I even get the hives in my hair and down in my ears and it itches like crazy!