I was looking over old tests as I have recently starting taking R-ALA to help modulate detox and had come across some disturbing things here re: lipoic acid & mercury. Way back I had tested high (in the upper 20%) for arsenic and mercury on a Metametrix test, which tests urine levels. However I was normal on a blood test less than a month later: Arsenic: below detectable range Mercury: 4 (0-9 ng/mL) I have never had amalgam fillings and was never big into giant fish. I don't eat fish very much now. I did live in China for a number of years and so am sure was exposed to a lot of mercury from all that coal burning. Should I be satisfied with the blood tests or do I need to dig further? e.g., hair analysis or a chelation challenge test?