I was told that lack of iodine in ones diet will cause hair loss. Is this true? vitamins not the answer.fyi?

I am aware that coloring ones hair will do that too; that is not the issue; nor the problem; I know diet plays a big part in it also; is there anything out there (besides seaweed) that can help. thyroid problem; no dr. already ruled that out. I know there is a prevention. Anyone know?