For years I had been taking Armour Thyroid Hormone without any problems. Then my Dr was forced to take all of his patients off Armour and onto pharmacy grade T4/T5 so I had no choice but to take what the pharmacy had.
I started feeling weak and sick soon after starting the new med because of the fillers not agreeing with me. My Dr then ordered T4/T5 from the compound pharmacy as it has different fillers than the other one. I could tell a difference first dose and haven't had any more problems with it.