Sorry to say, Gingko has now been proven NOT to slow dementia. A report in JAMA on 3069 people aged 75+, half of whom took Gingko twice daily, and the other half a placebo Over 6+years, 523 contracted dementia, 246 on the placebo, 277 on the Gingko.
One other point about Gingko. Dr gerry Brady tells me that it's not a great idea to be run over by a bus if you are on Gingko. Surgeons have real problems staunching blood flow with Gingko