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I also think zapping makes a different to the face parasites... I put one handle under the armpt and one handle across my cheek... face twitches like crazy and calms down after a while. Face looks dramatically better after zapping. Really worth a try.
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My recent understanding is that even if most zappers are not able to kill helminths in a short period of time because the allowed intensity is too low or the frequency is not adequate to damage them, a small current with a frequency may help to disturb/stun the worms. The advantage of this is that it may weaken their ability to hide from/trick the immune system cells and then the immune system cells are able to detect the foreign organism as a threat and to build weapons/mechanisms to kill them.
But it may be really really slow to use this approach against big parasitic worms, or worms hidding in places where there is poor current flow.
I am sure this tech can be greatly improved, it is just the beginning.