What Does Potassium in Drinks Do for Your Body? | Mineral Balance Basics

Most people think of bananas when potassium comes up, but beverages quietly deliver a solid share of the mineral in the average American diet. The National Institutes of Health notes that milk, coffee, tea, and other nonalcoholic drinks rank among the top potassium sources for U.S. adults. Understanding what that potassium actually does in your body helps you make smarter choices about what you sip throughout the day.

What Role Does Potassium Play in Your Body?

Potassium acts as an electrolyte, carrying a positive charge that your cells use to conduct electrical signals. Those signals drive three critical jobs: nerves firing properly, muscles contracting on command, and fluid moving between cells to keep your body’s water balance stable.

Your heart is a muscle that depends on this electrical activity with every beat. When potassium levels sit in a healthy range, your heart rhythm stays steady and your skeletal muscles respond crisply when you ask them to work. Even your digestive tract relies on potassium-driven muscle contractions to keep things moving.

The mineral also works alongside sodium to regulate blood pressure.

How Much Potassium Do You Actually Need?

The amount your body requires depends on your age and sex. For adults 19 and older, the NIH sets the Adequate Intake at 3,400 mg per day for men and 2,600 mg per day for women. These targets support normal function across all the systems that depend on the mineral.

For food labeling purposes, the FDA uses a Daily Value of 4,700 mg for adults and children age 4 and older. That number represents the reference amount used on Nutrition Facts panels, and the FDA now requires potassium content to be listed on those labels, making it easier to track your intake.

Few people hit these numbers easily. A cup of milk delivers roughly 350 mg, while coffee and tea contribute smaller amounts. That’s why a varied diet matters more than any single drink. The NIH consumer fact sheet is clear that beverages alone are not a substitute for meeting your overall daily potassium needs through food.

Is Getting Potassium From Drinks Safe?

For healthy people with normal kidney function, potassium from food and beverages has not been shown to cause harm. Your kidneys filter out excess potassium and eliminate it in urine, so your body naturally maintains the right balance as long as your kidneys are working properly.

That safety margin changes for certain groups. People with chronic kidney disease and those taking medications that impair potassium excretion can develop hyperkalemia, a condition where potassium builds up to dangerous levels in the blood. The NIH explicitly states that its intake recommendations do not apply to individuals with impaired potassium excretion due to kidney disease or medications that interfere with this process.

If you fall into that category, talk to your doctor about potassium from all sources, including drinks. For everyone else, the potassium in your morning coffee or afternoon milk is doing useful work, not creating a problem.

Which Drinks Give You the Most Potassium?

Dairy leads the beverage category. A standard glass of milk provides more potassium per serving than most other common drinks, which helps explain why the NIH lists milk among the top dietary sources for U.S. adults. Coffee and tea also contribute meaningfully, especially for people who drink several cups daily.

Beyond those staples, several beverages pack a respectable potassium punch:

• Cow’s milk delivers roughly 350–380 mg per 8-ounce glass, making it one of the most concentrated potassium sources you can drink
• Orange juice provides about 450 mg per 8-ounce glass, though the natural sugars are worth considering
• Coconut water offers around 400–600 mg per cup, depending on the brand
• Tomato juice contains approximately 550 mg per glass, among the highest of any beverage
• Coffee and tea contribute roughly 90–120 mg per cup, adding up quickly for regular drinkers

When you’re weighing your options, check the Nutrition Facts label now required by the FDA. You’ll find potassium listed in milligrams alongside sodium, which gives you a clear picture of what each drink actually delivers.

If you’re sizing up your options for a daily drink that supports your potassium intake, our roundup of the best drink for potassium needs compares the top choices head to head.

Potassium drinks work best as part of a varied diet, not as a replacement for whole foods. Fruits, vegetables, beans, and dairy together cover your daily needs more reliably than any single beverage, and your body uses that potassium best when it comes from a mix of sources.