They aren't a miracle cure, but they do slightly improve my brain fog. It's been easier to focus for longer periods of time, and I'm getting more hydrated at the same time.
I used to have to drink 3 Gatorades and 1 liquid IV a day, but I'm someone who loves water and I didn't like drinking all of the flavored drinks every day.
With buoy now I can drink 1 liquid IV and use buoy the rest of the day. On bad days I might still need an extra electrolyte drink, but buoy helps immensely.