I get it that the anecdotal conclusion is positive, but I found this:
https://efsa.onlinelibrary.wiley.com/doi/full/10.2903/j.efsa.2024.9100
Hm, sounds like it might still work at high doses. But more evidence needed.
"the Panel took into account that the acute effect of creatine on working memory, observed in two studies at 20 g/day for 5–7 days, was not seen at lower doses (2.2–14 g/day), or with continuous consumption (5 g/day for 6 weeks following a 5-day loading phase). Furthermore, the effect on response inhibition at 20 g/day for 7 days was an isolated finding among 10 intervention studies in healthy individuals, with no effects observed on other cognitive domains."
"the Panel took into account that the acute effect of creatine on working memory, observed in two studies at 20 g/day for 5–7 days, was not seen at lower doses (2.2–14 g/day), or with continuous consumption (5 g/day for 6 weeks following a 5-day loading phase). Furthermore, the effect on response inhibition at 20 g/day for 7 days was an isolated finding among 10 intervention studies in healthy individuals, with no effects observed on other cognitive domains."