Fluid balance
Potassium is the principal positively charged ion inside cells.
Potassium
Mineral & electrolytePotassium is an electrolyte your body uses for fluid balance, nerve signals, and muscle contraction.
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What it is
What Is Potassium?
Potassium is an electrolyte your body uses for fluid balance, nerve signals, and muscle contraction.
You do not need to memorize a nutrient chart. The useful part is knowing where it shows up in food, roughly how much you need, and what that can look like on an actual plate.
What the body uses it for
What Potassium Actually Does
Nerve signaling
Potassium gradients help generate electrical signals in nerves.
Muscle contraction
Normal potassium balance is required for muscle and heart-cell electrical activity.
Cell function
Potassium gradients support transport processes across cell membranes.
How much you need
How Much Do You Need?
Recommended amounts depend on the nutrient, age, sex, and life stage. Some compounds do not have an established Dietary Reference Intake.
Use the authoritative source below for the current RDA, AI, upper limit, or other guidance that applies to Potassium.
See current intake guidance →Food sources
Where Potassium Shows Up in Food
You do not need to memorize this list. These are everyday examples of foods that can contribute Potassium. Amounts can change with serving size, variety, preparation, and fortification.
Potatoes
Beans
Bananas
Yogurt
Leafy greens
Food composition reference: USDA FoodData Central.
Make it useful
What Does That Look Like on a Plate?
Knowing what is in your food is useful. Knowing what to do with it is better. Pick a food. Find a recipe. See what you already have. Plan the meal. Buy what is missing. Then go eat food.
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A little context matters
When More Isn't Better
People with kidney disease or certain medications may need individualized potassium guidance because blood potassium can become too high or too low.
Food and supplements are not the same thing. Supplements can deliver much larger doses. Medications, pregnancy, kidney or liver function, allergies, and other health circumstances can change what is appropriate.
Evidence & trusted sources
Where This Information Comes From
NIH Office of Dietary Supplements – PotassiumPrimary nutrient reference
USDA FoodData CentralFood composition and nutrient data
Evidence last reviewed: October 2026
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