Potassium
An essential electrolyte for blood pressure, heart rhythm, and muscle function.
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What it is
Potassium is a major electrolyte that balances sodium, supports healthy blood pressure, and enables muscle and nerve signaling. Most people get too little because diets are low in fruits and vegetables.
How it works
Potassium is a major electrolyte that balances sodium, supports healthy blood pressure, and enables the electrical signals that drive muscle and nerve function, including the heartbeat. Most people fall short because diets are low in produce.
What it's been studied for
Used to support healthy blood pressure and overall electrolyte balance — ideally through food.
What the evidence shows
Higher dietary potassium is linked to lower blood pressure, making food sources (fruits, vegetables, legumes) a genuine heart-health lever. Supplements are limited by design.
Who should consider it
Nearly everyone benefits from more dietary potassium (from fruits and vegetables) for blood pressure. Supplements are deliberately low-dose and, for people with kidney disease or on certain heart medications, potassium can be dangerous.
Amounts commonly studied
Adequate intake is several thousand mg per day, best from food. Over-the-counter supplements are legally capped at 99 mg per serving for safety.
How to take it
Adequate intake is several thousand mg per day, best from food. Over-the-counter supplements are legally capped near 99 mg per serving for safety. Higher-dose potassium is a medical decision.
Forms & absorption
Food is the best source; supplements are low-dose by regulation.
Food sources
Potatoes and sweet potatoes, beans and lentils, bananas, oranges, spinach, avocado, yogurt, and tomatoes.
Safety & interactions
Important: high potassium can dangerously affect heart rhythm, especially with kidney disease or medications like ACE inhibitors, ARBs, or potassium-sparing diuretics. Don't take potassium supplements beyond food without medical guidance if any of those apply.
Myths & what it won't do
Myth: potassium pills are the easy fix for blood pressure. Reality: food potassium is the real lever; supplements are capped low for safety. Myth: more is always better. Reality: excess potassium can dangerously affect heart rhythm, especially with kidney issues or certain drugs.
Common questions
- Why are potassium supplements so low-dose?
- For safety — too much potassium can cause dangerous heart-rhythm problems, so over-the-counter products are capped near 99 mg.
- How do I get more safely?
- Through food — fruits, vegetables, beans, and dairy are rich, safe sources that support blood pressure.
- Who should be cautious?
- People with kidney disease or on ACE inhibitors, ARBs, or potassium-sparing diuretics — they should only adjust potassium with medical guidance.
The amounts listed here are what published research has used — not a prescription or a recommended dose for you. Confirm anything you plan to take with your own healthcare provider, especially if you take medications, are pregnant or nursing, or have a health condition.
Related goals
Research on Potassium
Recommendations on this page are informed by published research. This is educational information, not medical advice.
- Aburto NJ, Hanson S, Gutierrez H, et al. Effect of increased potassium intake on cardiovascular risk factors and disease: systematic review and meta-analyses. BMJ. 2013;346:f1378. View study →Note: Found higher potassium intake lowered blood pressure, especially in people with hypertension, and was linked to lower stroke risk.