They can not become immune anymore than you can become immune to hand grenades. Miracle-Mineral-Supplement seems to be the best broad spectrum parasite killer. People that have had parasites move to other areas in response to herbs don't seem to have that problem with Miracle-Mineral-Supplement .
If you want to be aggressive just follow the directions and don't do anything crazy. 2 doses a day. Every dose increase by 1 drop until you feel a little sick. Then REDUCE one or 2 drops depending on how nauseas you feel. Then in a few days test the upper limit again.
If you want to be real aggressive take 1-2 drops then an hour later another small dose and then in another hour another etc etc etc this will make it penetrate deeper.