EMF's is a gray area. I know of one prominent homeopath who instructs all his patients to avoid EMF exposure during a treatment regime which can last up to 10 days, and some patients have to avoid them every day. He says that EMF's excite the mercury, so it sticks instead of being excreted. But this has probably to do with the fact that his treatment is homeopathic (energetic), so maybe man-made electro frequencies counteract the treatment working. It maybe doesn't apply to the other well known chelating agents so much. In any case, his methods failed for me, and the EMF avoidance didn't help my sanity. It certainly doesn't help if you want to do research.