Doctors who don't believe in parasites, don't know anything about them, so they most certainly don't know how to treat them, either. They won't give you enough of the prescription drugs to kill them all. They might give you enough to kill a couple of mother loads, but not all the hatchlings. But you may need to treat them five days on, ten days off, for ten rounds, depending on what kind you have. The doctors will only give you 2-3 prescriptions, at most. Then may tell you that you have cancer, want to do chemo therapy and radiation. The herbs are much safer and work better for long term preventive maintenence. Prescriptions are very hard on the liver. Herbs clean out the liver. You don't want a bunch of dead worms rotting in your liver. You have to do routine preventive maintenence as long worms exist, because they are always trying to come back and re-establish. You can't get doctors to give you drugs every six months for the rest of your life, and you wouldn't want to take them anyways, because it would be too hard on your body. God's medicine is best. Use natural supplements. Just my opinion.