Mary, Zoe has never had any antibiotic, or any other pharmaceutical or OTC drug with the exception of Tylenol, which she has not had since she was a few months old. But she is partially vaxed and she has probably eaten meat and dairy which was contaminated with antibiotics. Thanks for the info though. This is interesting, makes me wonder about the antibiotics (and pesticide residues) in food, whether it can have similar effect on bile. Thoughts, anyone? Stacie PS Zoe has been on probiotics off and on for the past year. She's on them again now. Dairy free of course. Her stool showed a few pathogens, but not in an alarming number. They seem to think a PB supplement will keep that in check just fine. I really think pork was a huge problem for her. What was I thinking? _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com