I'm guessing anybody who's parasites 'scattered' didn't zap. The worms eat their way out of the digestive tract just fine without herbs even, and given a reason to leave, they'll go even quicker.
I'm pretty sure big pharma wants everyone to doubt ANY way that actually works and which doesn't require LOTS and LOTS of their expensive murderous toxins--er---I mean 'drugs'.
But hey---live your life however you like. If you want to be one of the statistics of the whole currently leading cause of death---doctor/drugs even correctly prescribed, be my guest. Feel free to believe all the propaganda big pharma dishes out. They'll be thrilled, considering how much money the spend on advertising, to say nothing of falsifingy research.