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Recently, the açaí berry has been marketed as a dietary supplement. Companies sell açaí berry products in the form of tablets, juice, smoothies, instant drink powders, and whole fruit.
Marketers[who?] of these products make unverified claims that açaí provides increased energy levels, improved sexual performance, improved digestion, detoxification, high fiber content, improved skin appearance, improved heart health, improved sleep, and reduction of cholesterol levels. Quackwatch noted that "açai juice has only middling levels of antioxidants—less than that of Concord grape, blueberry, and black cherry juices, but more than cranberry, orange, and apple juices." Furthermore, the extent to which antioxidants by themselves promote health is a matter of some debate. No credible evidence suggests antioxidants promote weight loss. According to the Washington, D.C. based Center for Science in the Public Interest (CPSI) thousands of consumers have had trouble stopping recurrent charges on their credit cards when they cancel their free trials.  Even web sites purporting to warn about açai-related scams are themselves perpetrating scams. Apparently false claims include reversal of diabetes and other chronic illnesses, as well as expanding size of the penis and increasing men's sexual virility and sexual attractiveness to women. .
As of March 2009, there are no scientifically controlled studies backing up any of these claims. According to ABC News correspondent Susan Donaldson, these products have not been evaluated (in the United States) by the FDA, and their efficacy is questionable. In late 2008, lawyers for The Oprah Winfrey Show began investigating alleged statements from supplement manufacturers who suggested that frequent Oprah guest Dr. Mehmet Oz had recommended their product or açai in general for weight loss.
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