About 1.7 µg per kilogram. I weigh about 95 kg. I have TSH 0.5-1.0 with 162µg T4.
My hypothesis is that I have chronic intracellular HSV-1 infection that is causing my CFS. I have consistently HSV-1 IgG ">1:20,000" (it's so high the lab can't even give the exact value) which is extremely high. For comparison, I have EBV IgG 1:128.
I know I am getting a lot worse when I get even mildly hypothyroid, and a possible explanation would be that HSV-1 is replicating much better in a hypothyroid state. There is a study in rats where this effect was 10-fold, i.e. ten times more replication in hypothyroid rats:
https://www.ncbi.nlm.nih.gov/pubmed/23883178
BUT: The same study says that replication is a lot LESS replication in hyperthyroid rats and there are a host of other studies that show thyroid hormones (both T3 and T4) can suppress herpes simplex reactivation.
So if HSV-1 is really the cause, why am I getting so much worse when I get in a hyperthyroid state? It should suppress HSV-1, but I am getting worse.
So maybe the Akt activation effect of the thyroid hormones is stronger than the inhibitory effect. Or thyroid hormones don't affect intracellular replication (possibly abortive/noncytolytic) in the same way as lytic replication.
The supplement I could order via amazon says it has 5mg elementary lithium. But I will ask in my pharmacy if they have a real medication with lithium. The quality is usually better than for supplements.