danger shouldn't be a relative term because when people are making important decisions they should have a good idea of the risks involved. there are good data for the harm/benefit ratio for gallbladder surgery, but none for the gallbladder flush (esp not in comparable patients). when i first came to this site someone said to me the dangers of the gallbladder flush were as likely as being struck by lightning or a meteorite. well that was not supported by any data and in any case being struck by lightning is at least 10 times as likely as being struck by a meteorite.
of course the majority of people doing the Liver Flush who don't have stones the risks are much less - but then why do it?