Do any natural antibiotics like berberine, wild oregano, or peppermint work? i want to treat sibo.

Not that good for SIBO: Peppermint oil is best for indigestion, and already know is excellent if you're using it at the start of having a cold, otherwise it can have a heated, or burning sensation. Not sure about berberine. However with SIBO, it's best to address it at its root cause, and work with your integrative medicine doctor to discuss, and work through the multi system, dietary implications.

Yes, as well as abx: A recent research study shows herbal medicines can be even more effective than the standard antibiotic used to treat SIBO. The herbs you mentioned may help, as well as others including garlic, olive leaf extract, Hu Zhang and Andrographis. See http://chriskresser.com/sibo-what-causes-it-and-why-its-so-hard-to-treat/ and click on the link to the study. I also advise probiotics and dietary changes.