Tell us what exactly is saw palmetto and how's it supposed to help people with prostate enlargement?

NPR: Slate's Medical Examiner: Doubts on Supplements

Their supposed uses range from echinacea to treat the common cold to saw palmetto for the symptoms of prostate enlargement.

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To test their technology, Rabiner and Hare used it to experimentally treat prostate enlargement, where the prostate grows and compresses the urethra.

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Since only 300, 000 patients undergo surgery every year for prostate enlargement, compared with some 60 million who suffer from cardiovascular disease, Rabiner opted to pursue that market in 2000.

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One of them is saw palmetto and that is used by some men to stop prostate enlargement, which I understand happens as men get older, their prostate enlarges and it becomes quite uncomfortable and difficult to urinate.

NPR: Slate's Medical Examiner: Doubts on Supplements