Recommended daily amount is 4.7 grams, or 4700 mg.
How many people get that amount ? About 2% of the population. And bananas are relatively low in potassium. Just like many things people believe, most of what people believe is wrong.
Personally, I ingest double that amount. When I first started years ago back on Vulcan, I felt every cell in my body light up, energized, tingling. Warmth. Energy. Glowing. My ESP increased dramatically, along with ability to cause synchronicities.
Here are some clues in the link below, authored by an MD. Interested persons can undoubtedly find much material on this. If you find something noteworthy, please post it.