Rate your favorite nootropics
Have you tried nootropics, those performance-enhancing drugs or procedures that claim to increase mental or physical ability? Rate those you’ve tried and see how your results compare to thousands of other respondents: https://www.nootroflix.com/. Especially nice is how the site uses your answers to suggest other nootropics to try, based on others who answers were similar to yours.
Here are the first few suggestions it gave me when I told it that I’d tried magnesium without noticing any effects.
Astral Star Codex has a nice summary of the initial results and suggests that it proves nothing other than placebo effects and the natural bias to overestimate efficacy when something costs money or requires extra effort.