one thing that seems to work for me is distressing and lots of selenium, some vitamin E and A. And clean liver! Theory is that thyroid is vessel for all the crap coming from blood system and gut But as soon as you get some some form or stress. bam! out the door goes all the hard work. Come to think of it I have been going through lots of stress lately and very unhealthy eating habits again. Only short period of it but could be enough to have pushed thyroid along with excessive magnesium over the line!