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I'm not closed off from the idea but I haven't seen anyone posting that they passed big parasites after using zappers.
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Because there is no proof (if you have one please show us). Those who say that the zapper helped to kill parasitic worms also used others treatments at the same time (including parazapper with Epsom Salt and #461 with herbs...
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Some of my patients have tried the Rife frequency generator. But the Rife frequency generator does not penetrate deeply enough into organs like the liver or gallbladder. It might be partially effective at best.
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If you assume that this technology is the same than the original Royal Rife frequency generators, but for many frequency generators or zappers it is not the case, see : //www.curezone.org/forums/fm.asp?i=2273023#i