Usage Note
Potassium is the chemical element (symbol K, atomic number 19); it is an uncountable noun in French like in English. The adjective is potassique (e.g. engrais potassique, 'potassic fertiliser'). In nutrition contexts, bananas are often cited as a potassium-rich food.
Examples
"Les bananes sont riches en potassium."
Natural Translation
Bananas are rich in potassium.

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