My mother always swore by Ginko Biloba, and there's no doubt, up until her sequence of strokes, she was more on the ball than 98% of the population. I do think it's important to recognise though that just because something is "herbal" doesn't mean it can't have interactions with prescribed medication. GB for example acts as a blood thinner, so it probably wouldn't be a good ides to take it with another one.
Incidentally, regarding your question on the other thread with reference to EPAs. I think a lot depends on how separate your financial lives are. If your mother had a property that needed to be sold, for example, and she needed to go into care, without an EPA or a recievership you wouldn't be able to sell it.
Jennifer