If cellulose binds thyroid hormone, and sugar on the other hand makes absorption easier, why would Forest replace sugar with cellulose? I read somewhere that they wanted to make Armour more diabetic-friendly, but wasn't there any other filler they could have chosen, instead of cellulose?
Although, I have to admit that every drug I have at home (be it prescription only or OTC) contains cellulose as a filler/binder...so it seems pretty common. Maybe it's not usually a problem, only if combined with thyroid hormone...?