Erectile dysfunction refers to the repeated inability to achieve or maintain an erection sufficient for satisfactory sexual intercourse. The causes of erectile dysfunction are varied and include medications, injuries, vascular or nerve disorders, and psychological factors. Current treatment for erectile dysfunction involves the use of substances that cause vasodilation of the arterial capillaries and maintain this vasodilation, prolonging the erection of the penis during sexual intercourse. Arginine and ornithine are two amino acids that can cause vasodilation of arterial capillaries. Plants of the genus Epimedium contain icariin, an active compound that can inhibit the enzyme 5-phosphodiesterase, thus maintaining vasodilation of the arterial capillaries. Presentation: Pack of 14 capsules.