It definitely works, but the hair grows back in about 4 months. One of the PhD's I worked with put it on his face & it took about 4 months before he could grow hair again.
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That probably explains why some folks' hair falls out when they do iodine. They freak out since their hair is falling out, but it's acrually a good and visible sign that they're losing F that was accumulated in them.
JIttery female types might get emotional about it and it may be best to strap them to a chair or bed prior to giving Iodine to those types, in order to preserve grandma's china set and their own sanity.