The following was posted in 2005-2006 about ParaZapper products that were being sold at the time. It DOES NOT apply to current ParaZapper products, although they are more efficient in killing microbes, because the survey did not include them.
Among customers responding to our survey when ParaZapper was sold for use on humans, of those who used ParaZapper ™ to reduce parasites,
92 % reported some success,
84% reported good results ( better than 50 percent improvement ), and
38% reported very good ( more than 75 percent improvement ) results to reduce parasites.