"natural" is a generic term, just because the chemical in a substance is made by a plant or animal, it is termed "natural" by the herb and "natural" supplement marketers
in all seriousness, your body cannot tell the difference is something is made synthetically, or from a plant, and even at that, an organic of synthetic compound can still be detrimental, or helpful to the body... the whole "natural cure" type of marketing scheme is a gimmick
i know some supplement saw palmetto, but nothing i have seen results, even with maintenance success
also, i know there have been studies that have now concluded that it does little in helping bph, which is also caused by dht, as in mbp as well