As far as I know, Naturethroid was reformulated not long after Armour. Yet, many still seem to do well on Naturethroid, and quite a few patients switched to it from Armour and are happy with it. So I cannot help but wonder: what makes NT work better than Armour? Does it contain less cellulose? I know it's also hypoallergenic, but cellulose is often said to be the problem with reformulated Armour (but not NT)?