The zapper current passes mainly through our liquids. It does not enter well in some of our hollow organs such as the intestinal contents, instead the parasite cleanse does this very well. But the parasite cleanse does not boost our immune system, which instead the zapper does . Therefore, the two methods complement each other. Dr. Clark has ALWAYS used the zapper together with her parasite cleanse and her other organ cleanses and NEVER used only the zapper as some claim she has.