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From Proceeding of the Mini Workshop Southeast Asia Germany Alumni Network (SEAG):
"... the Korean ginseng (Panax schinsen) has been well known as a tonic, treatment for Diabetes Mellitus, effective to develop energy, sex ability, to cure eyes and hearing to develop brain efficiency and to long life..."
Is that a local myth or a well-established scientific fact?
There is no proof that ginseng has any effect on cognitive faculties, so it's not an established fact at all:
Currently, there is a lack of convincing evidence to show a cognitive enhancing effect of Panax ginseng in healthy participants and no high quality evidence about its efficacy in patients with dementia. Randomized, double-blind, placebo-controlled, parallel group trials with large sample sizes are needed to further investigate the effect of ginseng on cognition in different populations, including dementia patients.
In the review (i.e. a collation of all the scientific results known so far), the author identifies some possible effects, but not enough scientific evidence to claim them as fact.
