Dr Oz: What Does My Appendix Do? Appendix Stores Good Bacteria NEXT PAGE ADVERTISEMENT Dr Oz: What Does My Appendix Do? If you have ever wondered what your body organs do, this is the time to find out from Dr Oz. He has talked about the Kidneys and the Pancreas recently, and it was now time to learn about the Appendix. Dr Oz: Where is the Appendix? If you have always wondered what the appendix does, you are in good company. But new research suggests it is a storage area for healthy bacteria.