Recovering, I think I know the comments you are referring to, I think I read the same comments several months back when reading somewhere between 108 Pages and the CDs that come with a purchase. These commenst sort of confused me a bit too the first few times I read them. The main topic was on Black Walnut Hull Tincture but I think the potential bad aspect had to do with the Potassium Iodine component of it. Not that Potassium Iodine is all bad but I think it may have been a warning that it's easy to get too much Potassium Iodine that is the potentially bad part. If  I can find the specific quote, I'll check back.

EDIT: I got lucky pretty fast finding the reference. It's from my MH-CD that came with a purchase early in 2006. The CD is named "BAREFOOT INFO" and contains several folders. The first folder is named "2006 prices". Another folder is named "July Website", which I interpret to mean it is a copy of stuff from the web site the way it was in July 2005. Inside the July Website folder are many files for reading about various herbs and products, including a PDF with the name "about dewormer", that contains the following info that I think might be the info that motivated your question.

Christopher Hobbs is the best man on the earth for herbal information, just ask Schulze or David Christopher, they are all part of The School of Natural Healing and the result of Dr. John R. Christopher's mentoring. I asked Dr. Hobbs his opinion about green hull walnut and He promptly sent me 5 or so pages from a German Science book dating 1950 and it explained everything you could ever imagine and then some about the black walnut tree and low and behold, the green hull of the mature walnut is not a dewormwer at all, it is a source of potassium and organic potassium we all know is the basic reason for all diseases.