Researchers Withdraw Study on Weight-Loss Supplement Praised by Dr Oz October 22, 2014 Econ Evidence Researchers behind a study of green coffee bean extract as a weight-loss supplement, which was praised by Dr Oz, have admitted the data was bogus.http://www.dailymail.co.uk/news/article-2801728/Dr-Oz-endorsed-weight-loss-supplement-study-fake-researchers-admit.html