If it reduces parasite load, what is the problem? You can do a Google search if you'd like to find a studies. I am simply offering suggestions that have worked for me and my birds.
"If " is the middle word in life. That can be a problem when it comes to curing disease, and whether life is sustained or not. You claimed pumpkin seeds and castor oil are a "dewormer". I merely asked if you could provide something scientifically substantial to prove that. Then you mention Google. You might want to consider the outside environment/climate may be the reason you never see worms, and that pumpkin seed and castor oil have nothing to do with it. Many people on this forum can attest to parasitic worms being abundant in temperate or more humid climates as opposed to more arid climates. If you can't provide any trial records proving pumpkin seeds and castor oil are a dewormer from any College station in the United States, or anywhere else, just say so. Personal websites, opinions, and blogs don't get a pass.