Saw palmetto extract is frequently marketed as a dietary supplement aimed at alleviating symptoms of benign prostatic hyperplasia (BPH), also known as prostate gland enlargement, a prevalent condition in aging men. Symptoms of an enlarged prostate include increased urination frequency or urgency, trouble starting urination, a weak urine stream or one that stops and starts, dribbling at the end of urination, and the inability to fully empty the bladder.