I think this is a very interesting question posited by thom, and one I've researched on this board before. I've read on this board that 12.5 mcg is an effective way to increase your level of T3 production and, ostensibly, avoid most of the advese side effects that result from taking higher doses of T3. Nordstrom and Fonz have summarily addressed this issue, but BUMP to a more detailed discussion from the experts on here.
Peace
Pluto1