http://www.ncbi.nlm.nih.gov/pubmed/12851125Finally, after the third month of treatment, 92.5% of the men experienced a normal erection. We conclude that oral administration of L-arginine in combination with Pycnogenol causes a significant improvement in sexual function in men with ED without any side effects.
Quick Summary:
Pine Bark Extract; Pycnogenol is investigated for its general health and anti-diabetic properties and its ability to enhance Nitric Oxide, which appears to significantly help erectile dysfunction.
http://examine.com/supplements/Pycnogenol/Appears to reliably increase blood flow in people independent of disease state following oral administration of reasonable doses of Pycnogenol; these effects may be independent of an increase or decrease in blood pressure