Saw palmetto is a small palm tree native to the southeastern United States. It is sometimes used as a dietary supplement to support prostate and urinary health in men, but the effectiveness of saw palmetto for these purposes is not well-established. It is important to note that saw palmetto has not been evaluated or approved by the Food and Drug Administration (FDA) for use as a supplement. It is always best to consult with a healthcare professional before starting any new supplement or treatment.