Maybe we just don't have the visible kind? The first few days of ParaGone gave me a headache but I've been fine since. No real die-off symptoms. Could we be in that small margin of people who don't have worms!? I don't think I will continue on another parasite cleanse, at least for a while. I'm sure I'll do one again in the future. Hubby wants to have a baby so I will have to put the cleansing to rest. At least the herbal ones. I still plan to do liver flushes.