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Maybe this is the answer - it was posted on FOXNews this morning:

Energize Your Underpants
Tuesday, January 31, 2006

Trendy Australian undies maker aussieBum has rolled out vitamin-infused undies called Essence, according to The New York Post.

Company founder Sean Ashby told the paper health-care giant Bayer developed the drawers' special blend of polyester and lycra to "trap organic substances, which are then released slowly by natural body heat."

The enlivening underpants offer "dermo-protective properties" and "give your whole body an overall feeling of well-being," the company said.

The beefed-up briefs come in acerola, a plant rich in vitamin C, ginseng and the company hopes to release a Viagra version soon, Ashby told The Post.

The concept was cooked up by "a bunch of us sitting around the pub last year, having a few beers, when I asked, 'What can we do with our knickers that'll be the next big thing?'" Ashby told The Post.

"One of my guys joked that we should put vitamins in them — and everyone laughed. But the next day I realized what a great idea that was," he said.

The $24 laced lingerie debuts in New York next month at men's retail chain Universal Gear — they were launched in Australia and Europe last month.

The toughened tighty-whities stay vital through 15 washings, and then should be soaked in "Essence Extender" to re-energize them, Ashby told The Post.

Some 25,000 pairs of invigorating underpants have already been sold worldwide so far.