Also notice where that information came from...
Source: From a lecture by Dr. Robert C Beck
Bob Beck. He was adamant to not take garlic when a person was doing the "Beck protocal", especially with the Beck blood electrifier.
Someplace in more recent Clark stuff, she also mentioned garlic and onions as not being a good thing with parasites.
I would have to search to see what it was she said, but I remember her saying something in a radio interview.