I've tried NDT several times and cant tolerate the T3. Yes I've worked on ferritin, B12, D, and adrenals. I'm on my first month of T4. I started with some Synthroid samples and switched to my prescription which I was given generic of course. I started feeling better within a couple weeks but not perfect. I started to consider all the fillers in the Levo I would be exposed to for the rest of my life and wanted to try the Synthroid again so I pulled the samples out. Since taking it I've been totally exhausted. I can't get up in the morning and I'm sooooo tired all day. I have some breakthroughs of energy mostly in the evening. But I surely can't live like this forever! Anyone like Levo better than Synthroid? I'm confused bc everyone says name brand is so much better.