I am not an expert on this but I think we need to compare apples with apples. A zapper does not run on 60hz 120volt AC current which we know has been proven to be detrimental to the body and emit harmful emfs. The zapper runs on DC current. The body also runs on DC micro current (someone correct me if I am wrong). When we are ill/stressed the body's energy output typically decreases. A zapper gently brings up the body's overall DC current level while killing the parasites, bacteria,virus etc. There is probably much more that can be said about this but I will leave that to those with more knowledge on this subject.