Niteworks is made from L-arginine, an amino acid that helps produce nitric oxide.

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Herbalife is careful to make no medical claims for Niteworks--but it can't control what its 1 million distributors say about it.

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Although medicines can be sold only after their safety and efficacy have been proved, dietary supplements, such as Niteworks, get a laissez-faire pass.

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Now, even if guys don't want to cozy up to their brides, they can improve the health of their hearts and circulatory systems by taking Niteworks, says Herbalife.

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Herbalife's newest offering: Niteworks, a powder aimed at sedentary folks.

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"Niteworks is really a wonderful product, " says Johnson.

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