Green coffee bean extract, which Dr. Mehmet Oz promoted on his show as a “magic weight-loss cure,” had one scientific study backing up the extract’s purported effects. Now, that research has been retracted, the blog Retraction watch reported. Oz had to do some explaining on Capitol Hill in June, when senators asked him why he, as a surgeon and well-known doctor, promotes the use of weight-loss products that are scientifically unfounded. […] The green coffee bean manufacturer, Applied Food Sciences Inc., agreed to pay a $3.5 million settlement after the Federal Trade Commission charged the company with using the results...