R-Dopa, I have used Ginkgo in the past. Tried different brands.Tried different dosages. I personally believe the supplement is garbage for erection enhancement. You may be correct about the open study. A side note: I do have a friend that is diabetic and pushing 50.He has told me that he thinks the Ginkgo does help him achieve and maintain erection. But, he also sometimes uses Viagra.
panthers