There are no shortage of online sources that tout the benefits of ginkgo, fish oil, ginseng, Piracetam, choline, etc etc. But when I check out their WIkipedia pages, it looks as if there is no real evidence for improved cognitive functioning. I guess this is because, for one thing, cognitive functioning is not something that is easily measured for any number of reasons.

Nonetheless, I wonder if any nutritionists or experts in supplements here know of any preliminary evidence on the validity of a supplement or herb to improve, for example, memory, alertness, concentration, etc.

Obviously, there's exercise, meditation and caffeine... But are any of these other supplements worth considering?

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