The bloodroot will kill parasites. If you have a heavy wormload and you kill off too many at once, your body will not be able to remove the rotting corpses and all the toxins that are released. You cannot over dose on it, however, as it is an emetic and you will throw up if you approach a lethal dose. The best approach seems to be repeated methodical tenacious systemic cleansing, taking regular breaks to let eggs hatch out, but don't wait too long to take another round, or the hatchlings will have time to start laying eggs. Listen to your body. It will tell you when to take it, and when you need to rest. Do not confuse worm induced feelings with your body's own messages. If you feel anxious sad and irritable, it means the bloodroot is working. If you think you can keep it down, take more. Thanks for info on gentian violet. I ordered some.