I have come across a few articles promoting iodine for PN treatment. I've been taking 300 mcg/day in the form of sea kelp for a few months, as part of my supplement routine. I can't say things are getting any better, but at least they aren't getting much worse either. Whether that has anything to do with the iodine, I can't say - but its cheap and doesn't seem to be harmful if you stick to moderate doses.

I'm not sure I'd do the mega-dosing that some site promote though. Seems like that would be asking for trouble.