have you read hal huggins book(it's all in your head )? he mentions that it's not the amount of mercury in your body ,but how your body reacts to mercury, some poeple can have a mouth full of amalgam filling and have no problems and others can only have one filling and cause many problems ,it just depends how sensitive you are to mercury ,as far as dmsa with amalgams in ,the general rule is not to use chelators untill amalgams are out ,this way you will not be creating more problems for yourself ,dmsa can remove mercury from the amalgams and redistribute it thoughout the body ,but using algin to help remove mercury and other toxins can help while your amalgam is still in (it is not a chelator ) it mops up mercury in the blood stream and removes it from the body without removing mercury from amalgams