Yes, L-Theanine, Caffeine, Noopept, and Choline are good nootropic stacks. Although unlike the natural nootropic stacks listed above, Noopept is the synthetic nootropic. But it is scientifically proven for cognitive properties. Moreover, L-Theanine is a well-known anti-depressant, caffeine is a famous stimulant, and choline is the best cognitive enhancer