underactive thyroid
"I had been on Armour thyroid for about 15 years and always felt good.    Somehow the formula must have changed when Forest Labs was bought out although the new company denies that.   I started feeling really jumpy and couldn't get my numbers right.   I've been on Nature-Throid for about seven weeks.   It took some time to adjust but now I feel much better.   I've read that they don't use the fillers Armour does."