questions concerning use of milk thistle

Has anyone ever heard that milk thistle should not be taken if you have a diseased gallbladder? I have been trying to decide which organic milk thistle would be best and I read this warning somewhere, sorry, can't remember which website. I do not want anything but milk thistle in what I get because I have so many allergies. I looked at Dr. Schulze 's website but did not see any milk thistle. Can someone tell me a good US online source to get organic herbs? I am very confused. Thanks. Tweet