If not taken with iodine, or at a wrong ratio vs iodine; it may cause hair loss; as it may worsen a hypo Thyroid condition.
Same as if one take Iodine only and not selenium.
A good ratio IMO is 50 mg of iodine, 100 mcg of selenium. But there are different ratios depending on where you live. Selenium is very low at some parts of the world, other parts it is very high.
http://www.greenwillowtree.com/page.bok?file=selenium.iodine.html

Ps, several threads about hair loss at this forum.

iodine mobilizes mercury. selenium grabs it and moves it to a different place in the body and then lets go of it. i think the head is one of those main places, that or its just more easily noticed there.

as someone else pointed out, with mercury in the body more selenium is probably needed from it robbing the thyroid.

since i have been soaked and marinating in Iodine for a few years now and drinking only distilled water i find that i am clean of contaminants AND the body keeps repairing and improving.

i personally suspect mercury in most of these chronic and autoimmune diseases. the physiology and chemistry of the individual determines how these maladies manifest thus giving us that alphabet soup of modern diseases from ALS to MS and beyond.