Zappers definitely kills parasites, I know that first hand. It helped me recover some health. I had a real problem with liver flukes and my liver was very badly damaged.
Was it "the cure"? No, what I was eating and drinking was the real problem. BUT it helped and I needed to get my parasite problem under control so that my body could heal much faster than it would normally. I now use Barefoot's dewormer and am on a maintenance dose once per week now.
Personally, I think that's a good start, but it doesn't get to the core of the problem. If you're looking for true health advice, I'd recommend follow the Barefoot herbalist's advice, he has one of the forums on this website.