Saw palmetto extract is an extract of the fruit of Serenoa repens. It is rich in fatty acids and phytosterols. Serenoa repens, commonly known as saw palmetto, is the sole species currently classified in the genus Serenoa. It is a small palm, growing to a maximum height of around 7–10 ft. Its trunk is sprawling, and it grows in clumps or dense thickets in sandy coastal lands or as undergrowth in pine woods. It is endemic to the southeastern United States, most commonly along the Atlantic and Gulf Coastal plains.