If you purchased caffeine-infused underwear because of promises it would make you thinner, US federal regulators say you were hoodwinked - but at least you can get your money back.

The Federal Trade Commission announced this week that two companies have agreed to refund $1.5 million to consumers who purchased "shapewear", which can supposedly reduce cellulite and fat because it is infused with caffeine, vitamin E and other things.

The FTC said there is no scientific evidence to back up those claims. In a settlement, Norm Thompson Outfitters of Oregon, and Wacoal America Inc of New Jersey, agreed not to make claims that their products cause weight loss or a reduction of body size.

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