Additionally, hormonal therapies for men and women differ somewhat, so we cannot simply assume that what works for a man will work for a woman. Gingko has a long history of use in Chinese herbalism. Chinese herbalists also use gingko in different amounts and for indications that are not directly translatable to scientific medicine. Virtually all the studies have been done using one extract from a French company. Any claims made for gingko apply ONLY to this form.
All bets are off for other versions.
According to the Herb Research Foundation, the effective dose appears to be around 120 mg. This figure refers to the dosage of flavones and gingkolides and not to raw herb or total extract. Gingko is generally regarded as very safe, even by the US FDA, which is quite conservative on the subject. However, like most herbs, there's not a PDR that you can consult that tells you what the counterindications and drug interactions are. One elderly woman who took gingko after a stroke developed dizziness and low blood pressure.