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 Now, that research has been retracted, the blog Retraction watch reported.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.

"I don't get why you need to say this stuff, because you know it's not true," Sen. Claire McCaskill, D-Mo., told Oz.
When asked specifically about the green coffee bean extract, Oz cited a study that found people who took the supplements did lose weight. However, that study was funded by the product's manufacturer, and the panel noted this when questioning Oz. [5 Dr. Oz's 'Miracle' Diet Pills]
Now, even that evidence is gone. Two authors of the study published a notice last week, announcing that they are retracting their study.
"The sponsors of the study cannot assure the validity of the data, so we, Joe Vinson and Bryan Burnham, are retracting the paper," the authors wrote.
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 of the flawed study to make baseless claims, the agency announced in September.
"The FTC complaint alleges the study was so hopelessly flawed that no reliable conclusions could be drawn from it," the agency said in a statement.
According to the FTC, the Texas-based company paid researchers in India to conduct a clinical trial on overweight people, to test whether their dietary supplement that contained green coffee extract actually held weight-loss benefits. However, the FTC charges that those researchers altered crucial data in the study, including participants' weights.


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