This is very interesting, and I agree with you on the need to take T3, rather than T4 only meds. Most mercury toxic people have a problem converting T4 to T3, so T4 meds are about as useful as a sugar pill for us. I use Armour, but can't get up my Free T3 levels without going over range on T4, so I have cut back my dose and am using additional T3 in 6mg doses.

Just a comment about using TSH to evaluate thyroid status. It is largely useless, and no indicator of how the person will be feeling. I have a totally suppressed TSH (0.2), yet I still have hypo symptoms. Once the TSH is suppressed, you have to dose largely on how you feel, not by the numbers on a piece of paper. I thought I was at the right level, took some more T3 and felt loads better, so there is clearly room for improvement. Also, I have been hypothyroid for many years - I estimate since childhood, when I had my amalgams placed - so healing from decades of hypothyroid will take months or years at the right dose. So getting the TSH down to around 1 may not bring any real improvement quickly for a person who has been hypothyroid for a long time.

Best
Nicola