parasites was my topic, not diabetes and cancer. I admitted that frequency devices may have some stimulatory effect, probably on the immune system, but I have seen zero evidence that they kill parasites. My first experience with the Clark Zapper was when I had CFIDS and it made me worse (which wasn't die-off). Then I found other similar testimonies on the internet. Then I switched to using a Beck blood purifier and after 2 months was free of the causative virus. The Clark Zapper went into the trash.