John C. gave me this and it worked ok for me. If you can't find or afford a zapper right now just get a regular 9V battery and with the finger of one hand on one of the battery terminals rapidly (as fast as you can) tap the other terminal with a finger of the other hand. Do this for 7 minutes then rest for 20, zap another 7, then 20 rest then zap 7 more mins and you're done. You won't even feel a tingle from it so don't worry there. What it does is actually electrocute parasites so your body can expell them. You'll find more detailed info on zapping on Dr. Clarks site (the link is at the top of the home page).