Barry MJ, Meleth S, Lee JY, Kreder KJ, Avins AL, Nickel JC, Roehrborn CG, Crawford ED, Foster HE, Kaplan SA, McCullough A, Andriole GL, Naslund MJ, Williams OD, Kusek JW, Meyers CM, Betz JM, Cantor A, McVary KT. Effect of increasing doses of saw palmetto extract on lower urinary tract symptoms: a randomized trial. JAMA. 2011 Sep 28; 306(12):1344-51.