If you use a zapper and herbs at the same time you will think that the zapper manages to kill parasitic worms in a human body but it is probably the herbs which contain anti parasites substances that produced the killing effect...
Using several treatments at the same time and then claiming that these treatments works is the speciality of alternative treatments sellers, they just want to sell all kinds of useless things to the ignorant and gullible when only a few alternative treatments are really efficient.