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Your question has already been answered:
What are the best nootropic drugs to stimulate the brain? (11 responses!)
The best nootropics?
Is it true that the best nootropic is cocaine with phenibut?
— however, most people here describe their personal experience without referring to comparative studies.
But perhaps even more important is the answer to another question:
Do nootropics work?
— in short, there are few studies, and the available ones are doubtful (that is why they could not refer to comparative studies in the answers above), so a rational person does not have the right to say “yes, they work”.