Anne not sure where I gleaned this..but i think arsenic is one of the first metals to get excreted once you start working on this. that was my experience. Not to quote amy yasko ad nauseam...but she says there is an order in which metals get excreted. Mercury is the toughest to pull out I believe. Boyd Haley says it is very tightly bound in the body. Thanks for yr response Vegas. Glad you are making headway. FYI: I know kids who do IV EDTA w/out too many problems...so far as we can tell!