Sparrowhawk My gut felt like a million bucks after the colonoscopy! Getting "cleaned out" does help. Many docs are no longer requiring patients to drink 2 liters of that-junk. They have pills now and only a small liquid bottle of that mag citrate stuff. Much nicer now! If your symptoms really started after long term antibiotics, it could be something much different. Than SIBO. Good luck with "The American Gut" project. It sounds very interesting.