https://astralcodexten.substack.com/p/link-troof-on-nootropics

Should have signal-boosted this earlier, forgot, sorry.

The author of the blog Troof sort of replicated my 2020 nootropics survey. But instead of another survey, they made a recommendation engine. You rated all the nootropics you'd taken, and it compared you to other people and predicted what else you would like. The end result was the same: lots of people providing data on which nootropics they liked. Troof got 1981 subjects - more than twice as many as I did - and here were their results: