Re:Air Pollution Seems to Cause Dementia
by SketchySeaBeast on Friday May 10, 2019 @04:11PM
(#19881759)
https://articles.mercola.com/sites/articles/archive/2012/02/...
It can be both. Also, too much iodine can cause thyroid inflammation and cancer.
This page indicates hypothyroidism is a result of iodine deficiency, rather than excess. Hyperthyroidism may be caused by excess iodine.