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gwern comments on Firewalling the Optimal from the Rational - Less Wrong
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The first time I took supplemental potassium (50% US RDA in a lot of water), it was like a brain fog lifted that I never knew I had, and I felt profoundly energized in a way that made me feel exercise was reasonable and prudent, which resulted in me and the roommate that had just supplemented potassium going for an hour long walk at 2AM.
Experiences since then have not been quite so profound (which probably was so stark for me as I was likely fixing an acute deficiency), but I can still count on a moderately large amount of potassium to give me a solid, nearly side effect free performance boost for a few hours.
How much is that in milligrams? Googling, I see different values for RDA. Also, I take it you were using some sort of bulk powder? (The gel caps all seem to be ridiculously small, like 99mg when the RDA is >3000mg!)
I think I've been going with 4.7 grams as RDA. And yes, bulk powder. Due to potential digestive upset, I typically don't administer more than 25% RDA now.