* Dietary Supplement * Hypo-Allergenic Serenoa repens, also known as saw palmetto, is native to the southeastern United States, southern Europe, and north Africa. Traditional uses of saw palmetto include the support of the respiratory tract and gastrointestinal tract. Modern usage of saw palmetto as a dietary supplement is for the benefit of prostate health, by its positive effect on the metabolism of testosterone to dihydrotestosterone in the prostate. It also supports normal inflammatory processes in prostate tissue.