This is one of the reasons I and a few others bring up oral chelation for some postings.
for some it seems that Iodine get the mercury out just fine and for others, and I am guessing it is those of us that are detox challenged, Iodine can stir the pot big time.
also, no data on this, but I wonder how well Iodine gets mercury out of the brain. Blood brain barrier can be difficult to cross unassisted.