The zapper has had many healing effects on my body too. But it seems unlikely that the differant frequency was what caused the effect(mine is the ZP). Hulda Clark says that "Any positively offset frequency kills all bacteria, viruses and parasites." Different frequncies seem to have the same effect as others. Many parasites are caused by the environment. I have found that once I eliminate the environment, the problem is solved. Yes. Thank God for the zapper!