Hi there...I suspect I've had parasites for a very long time, but didn't know it until symptoms became more apparent. I was very sick with it 5 years ago, but have much improved since then, although the parasites have remained. I've seen many types, roundworms, flukes and Tapeworm segments. I haven't tried humaworm yet, and I may still...however I've used many of those herbs already, and usually I need very high dose of herbs to have any effect. We'll see...but, many people have good results with humaworm I think.