I have also heard that most intestinal worms cannot cope with oil and eventually die when you ingest it. Reason being (the way it was explained to me) is because their mouth is also their anus. When you drink oil and the the oil goes into them, it fills them up completely and as they cannot expel it, it suffocates them and they die. So oil would kill intestinal worms very well and the best oil for that is Castor, as it is the heaviest and most sticky type. Basically castor oil is mildly toxic and the Castor oil plant seeds are highly poisonous, but as they say, sometimes poisons taken in small quantities cure diseases.