Saw palmetto is a fan palm indigenous to California and the southeastern US. Aside from being one of the smallest members of the palm family, the plant is the only member of the Serenoa genus.
The berries, which are harvested in fall, are rich in phytosterols, plant steroid compounds that are marketed as supplements and added to margarine and other functional foods designed to help lower cholesterol.
Cut and sifted saw palmetto berries are too bitter to add to foods, but can be used to make tinctures and extracts. The berries are also used to make tea, usually in combination with other herbs and spices to enhance flavor.