Caffeine seems to be generally accepted by the nootropic community as falling into that category. There's at least as much clinical evidence of caffeine improvi

Caffeine seems to be generally accepted by the nootropic community as falling into that category. There's at least as much clinical evidence of caffeine improving cognitive function as many nootropics, so it seems reasonable to me. The list of nootropics is somewhat fluid, as much of the science behind them is either recent or currently occurring.