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It takes two things to convert T4 to T3. Good cortisol levels and good iron levels. You need to get a 24 hour saliva cortisol test and have all 4 iron labs (TIBS/%saturation/ferritin/serum). You need to have "optimal" levels not just "average" and/or "in-range". I would also get on a NDT instead...

I don't think you can use just T3 (Cytomel only) to treat hypothyroidism as 95% is totally absorbed in 4 hours. You would have to continually take it every 4 hours. Some will use an NDT product + a T3 product (Cyromel/etc.)