Hi all. I have longstanding CFS with Gut/Brain/nervous system symptoms and osteopenia. I have recently had my Reverse T3 tested as well as the standard Thyroid blood tests. The results came back with elevated Reverse T3 above reference range and my Doctor prescribed T3 only (Tertroxin). Apparently Reverse T3 is inactive form and while it is normal for the body to produce RT3, when elevated it blocks the cells and tissue from receiving the active T3 hormone. This means your blood tests can show normal thyroid function but your body is actually hypo-thyroid. However I'm so fed up with taking things and finding some things making me worse, but the Doctor is adamant that I should stay on this. I'm wondering has anyone else on here had RT3 tested, tried T3 only or got anything to share regarding their own experience with high RT3? I'm interested to hear whether it was helpful, whether you had any issues while taking it and whether anything else helped treat this and the underlying cause of the high RT3. Many thanks!