When I first switched onto Armour from Levo, I gained about 2 stone. I put some of that down to my mental state at the time, but i had been very successfully doing Weightwatchers prior to the switch and was a size 10. I rapidly went up to a size 16. It didn't feel like I was eating that much though. Around 6 months ago I started to lose again, and went down to a size 14. In the same time period I started to feel my symptoms returning, and am now increasing my dose by a 1/4 grain a day. Within days, i have started to gain weight again! I really am not overeating, and before I went onto Armour I maintained my size for months. I've I am convinced something in the Armour is making me gain weight, even though most people seem to lose on it. It's really hard to find any information about this and what to do. The weight gain is making me really unhappy, and I desperately don't want to gain MORE. Has anyone else experienced this? I am wondering whether switching to another brand eg naturethroid would make a difference? I know some people have reported side effects from the reformulation of Armour, and I wondered if this was a known issue? I think I need to be on a slightly higher dose of NDT which I am working up to, but I'm worried about increasing now as I don't want to pile on the pounds. In all other respects, Armour works amazingly well for me. I'm not deficient in iron or B12, I don't eat gluten, and I'm mainly low carb these days, I'm not sure what else I can do? Could it be adrenal?. Help!