Ginseng and Ginkgo Biloba Effects on Cognition as Modulated by Cardiovascular Reactivity

Study subjects received, in a double blind fashion, placebo pills identical to the drug (drug 1-ginseng, group 1; drug 2-ginkgo biloba-group 2)

The ginseng group received two capsules containing either 1000 mg or 500 mg of Panax Ginseng extract standardized to 3% of ginsenosides (GNC, USA) or similarly looking placebo capsules over a period of three days of testing.

The ginkgo group received two capsules containing either 240 mg or 120 mg of ginkgo biloba extract standardized to 24% ginkgo flavone glycosides and 6% terpene lactones (GBE24/6) or similarly looking placebo capsules over a period of three testing days.