Hi Dudley, many "brain" symptoms can actually be caused by mercury in the liver and other organs. It doesn't mean brain mercury, simply because you may get brain symptoms and vice versa. Sometimes brain mercury can cause body symptoms (e.g. hormonal and yeast problems etc).

DMSA for me, when I was mercury toxic did the job for the most part and my brain symptoms went away (or what was creating psychological symptoms). Liver toxicity and other organ toxicity can create psychological symptoms.

It is wise to start with DMSA, because the body areas are good to chelate first and some find DMSA may do more than enough on its own if they do not have significant brain mercury. Best to be certain and clear body first, before using a brain chelating agent, that might pick up more mercury from the body areas and bring it across the blood brain barrier into the brain (if you haven't first reduced blood/tissue levels).