Epimedium Extract CasNo.: 489-32-7 is prepared from Epimedium grandiflorum, native to eastern Asia, including China, Japan and Korea. Epimedium extract, also known as horny goat weed extract has been used to treat male erectile dysfunction. Epimedium extract powder icariin can increase the production of sperm, stimulate the sensing nerves, and indirectly promote sexual desire. Epimedium extract is ideal for adding to sexual enhancement formulas.