Thanks for replying!
The first 3 are reversible acetylcholinesterase inhibitors used in alzheimer's disease treatment. There are only a few studies on its use by healthy subjects. I've tried piracetam once, it was, like you said, undistinguishable from placebo. I guess I'll try phenylpiracetam and aniracetam. Which of the two would you recommend for learning?
Thanks!!