Improvement of erectile function with Prelox: a randomized, double-blind, placebo-controlled, crossover trial. Int J Impot Res 20: 173-180, 2008
Stanislavov R, Nikolova V, Rohdewald P.
Lipid metabolism and erectile function improvement by Pycnogenol®, extract from the bark of pinus pinaster in patients suffering from erectile dysfunction - a pilot study
Nutrition Research 23 (2003) 1189 - 1198