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Having read Dr. Clark's book (you can read it online at
Clarkia , which is linked from Zapperplans.com), I believe this is not correct. While Dr. Clark does recommend Zapping on an empty stomach, she gives no indication to the best of my recollection that Zapping would interfere in any way with herbal remedies.
I believe the confusion comes from a mistaken comparison of the Zapper with other forms of electo-healing mechanisms. Bob Beck and others recommend other higher voltage and higher current mechanisms, as well as electric and magnetic induction and heating. These may well be viable therapies, but are a completely different approach than the Zapper.
The Zapper provides a low voltage, extremely low current vibration that somehow seems to work on a microscopic level. No one to my knowledge, including Dr. Clark, seems to yet know just how it works. But, we do know that the voltage and current levels are well below safe levels and virtually everyone seems to get positive results with no worrisome side effects.
In my opinion, this kind of action should have no effect on vitamins, minerals, herbs and the like, anymore than it would effect food or water or other bodily functions in general.
Hope this helps. As always, this is my opinion and not medical advice.
God bless,
LP
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