Yes, like good bacteria. I'm sure some parasites are beneficial to the body, probably eat some of the rubbish we may put in our bodies. Otherwise wouldn't we all be a lot sicker than we are already, what with the environmental toxins, heavy metals etc etc.
What i don't like on some of these herbal parasite cleanse sites , i am a believer in herbs btw, is that any ailment is attributed to parasites. Failing eyesight, to name one, when there could be lots of reasons, and as we know fasting can improve eyesight.
What i like about waterfasting forum, know one is trying to sell me anything. If no profit is being made, there is no hidden agenda.