According from personal experience, what would be the best study stack you've had for memory, concentration, gain of interest, and attention? I know coffee is a quick fix a lot of times, but I really want to lay off the stims as much as possible. I also don't want to get tired on the product, as some nootropics get me more tired, and does more harm than good.
Thanks in advance. (PS I used the search function already lol)