Thanks Bex, that is more detailed than what I saw. He explained it more in that post than in his book. I was just going based on the fact that hypothyroid and addisson's/adrenal exhaustion can cause depression independent of mercury, thus if mercury was impacting the function of those organs, you'd get mental symptoms even though it isn't necessarily the brain thats doing it. But... that post clears it up a bit more. I'm not sure its realistic to assume if you have it in your body that you don't have it in your brain anyways...