The main issue is that Dr. Oz uses his show as a way to discuss products that don't have the scientific evidence to back them up
Following a healthy lifestyle including proper diet and exercise is a much more effective long-term solution to weight loss and health than supplements and medications. While I do not oppose the use of all supplements and medications, I think it is important to seek assistance from qualified and respected professionals (RDs and doctors who know your medical history) when determining their use. This again reveals that you cannot always trust what you hear. Do your research and be a knowledgeable, educated patient!