http://news.msn.com/offbeat/caffeine...r-buzzless-ftc

Caffeine-infused weight loss underwear buzzless: FTC

...Wacoal America, based in New Jersey, also advertised that its clothing had microcapsules with caffeine, vitamin E and other chemicals that it said led to weight loss. In one ad, it cited the "revolutionary iPant new shapewear that works with your body to eliminate cellulite," the FTC said....

At least men's underwear would keep him up at night.