Drs Lee and Kim administered Ginsana G115 (Insam, Korean Ginseng extract) orally to 20 patients with erectile impotence (Insam group) for 2.8 months (l-10 months).
Placebo was administered orally to 20 patients with erectile impotence (Control group) for 2.3 months (l-10 months).
The researchers found sexual intercourse was possible in 55% of patients of Insam group and not changed significantly after the treatment on the 11 improved patients of Insam group.
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Lee HY, Kim CS. Clinical Investigation of Insam (Korean Ginseng) on Sexual Potency. Korean J Urol. 1986 Apr;27(2):235-240.