If i remember correctly, Dr Clark says the current doesn't go to the deepest innermost bowel area, but does hit anything embedded in the walls which is where most helminths are attached. I know the Zapper gets them because I can feel it frying the b'stards! (excuse me, the little darlings). Nevertheless, the best program incorporates anthelmintic herbs, along with electro-therapy, for a more thorough cleansing. Try Dr. Clark's Wormwood , BWH, & Cloves, as well as her bowel program & Colloidal Silver for possible reactions to bad bacteria overload from the die-off.