The nootropics and biohacking community would benefit most of all by being told repeatedly every time they post online about their “stack” that a good night’s sleep and adequate water intake is more effective for cognitive function than every powder ever put into a pill.
Good sleep and frequent exercise are both amazing. That said, without a good to excellent diet or supplements, exercise can deplete things which in turn compromises sleep and recovery.
How do I know? My sleep quality was shot to shit. Tried Mg supplements on a hunch, and got a massive improvement in sleep quality and exercise metrics (I put the latter down to better sleep, not anything in the supplements). I'd tried all the other sleep stuff, no caffeine after 3pm, various GABA modulators, found the somewhat improved sleep quality wasn't worth morning foggyness and lack of motivation, and I didn't like the fog they cause generally (you sleep, but, like alcohol or weed, it's not _clean_ sleep.)