is an extract in the Serenoa repens fruit, found in the southeastern United States.
Saw palmetto's active ingredients include fatty acids, plant sterols, and flavonoids (antioxidants). Saw palmetto extracts reduce the amount of dihydrotestosterone (DHT) in prostate tissue, helping to improve urinary flow and prevent prostate infections. Some evidence shows that saw palmetto could reduce the risk of prostate cancer by lowering prostate-specific antigen (PSA) levels.