Dietary Potassium: How Much Is Healthy and Where to Get It

Potassium is an essential mineral and the main electrolyte inside the body's cells. It helps balance fluids, carry nerve signals, and let muscles, including the heart, contract, and it works in close partnership with sodium. Where sodium tends to be eaten in excess, potassium is the mineral most people fall short on. The World Health Organization notes that most populations around the world consume less than the recommended level, which makes potassium the quieter half of a balance that matters a great deal for blood pressure.

This guide is general and educational. It explains how much potassium most adults are advised to consume, why the figures from different authorities differ, why potassium matters for blood pressure and heart health, how it balances against sodium (the through-line it shares with the companion guide on dietary sodium), and which whole foods supply it best. It also draws a clear safety line: getting potassium from food is the right approach for the general public, while potassium supplements and potassium-based salt substitutes carry real risks for some people and are not a do-it-yourself choice. This guide does not set a personal target for any individual; people with kidney disease, heart conditions, or who take certain medications should follow the guidance their clinician gives them.

The essentials at a glance

• The World Health Organization suggests adults consume at least 3,510 mg of potassium a day (90 mmol), a level it rates as a conditional recommendation, while making a strong recommendation to increase potassium intake from food (WHO).
• In the United States the Adequate Intake is 3,400 mg of potassium a day for adult men and 2,600 mg a day for adult women, while the FDA Daily Value used on nutrition labels is 4,700 mg (NIH Office of Dietary Supplements).
• Most people fall short: most populations around the world consume less than the recommended level of potassium, the opposite of the pattern seen with sodium (WHO).
• Potassium and sodium work as a pair: increasing potassium and reducing sodium together lowers blood pressure and cardiovascular risk, and a diet high in sodium and low in potassium is linked to raised blood pressure (WHO).
• Whole foods are the best source: leafy greens, potatoes and sweet potatoes, beans and lentils, bananas, dried fruit such as apricots, prunes, and raisins, avocado, dairy, and fish are all rich in potassium, and a medium banana has about 420 mg (NIH Office of Dietary Supplements).
• Potassium from food is safe for the general public, but potassium supplements and potassium-based salt substitutes can be dangerous for people with chronic kidney disease or who take certain medications, and should only be used under a clinician's guidance (NIH Office of Dietary Supplements; National Kidney Foundation).

How much potassium a day: WHO and the US figures side by side

Two reference points are worth seeing side by side, because they are framed differently. The World Health Organization suggests that adults consume at least 3,510 mg of potassium a day, a figure it also states as 90 mmol a day. An important nuance sits in how WHO rates this: the precise number of at least 3,510 mg a day is a conditional recommendation, while the broader advice to increase potassium intake from food, to lower blood pressure and the risk of cardiovascular disease, stroke, and coronary heart disease in adults, is rated as strong. In plain terms, WHO is firm that more potassium from food is beneficial, and more cautious about pinning down the exact target number.

In the United States the reference is the Adequate Intake, set by the National Academies and reported by the National Institutes of Health Office of Dietary Supplements. It is 3,400 mg a day for adult men and 2,600 mg a day for adult women. Separately, the Daily Value that appears on nutrition and supplement labels in the United States is 4,700 mg, a single label-reference figure rather than a personal intake goal. These numbers are not in conflict; they come from different bodies using different methods, and they all point in the same direction, which is that most adults benefit from more potassium than they currently get.

The figures are best read as general population references, not as a personal prescription. None of them is a target the reader should try to hit to the milligram, and a clinician may give a different and sometimes much lower potassium target to a particular person, especially someone with kidney disease or a heart condition or who takes medications affecting potassium. The practical message that all the numbers share is consistent: the typical problem is too little potassium, and the food-first way to address it is to eat more of the whole foods that supply it.

Why potassium matters, and the sodium-potassium balance

Potassium earns its place in heart-health guidance through its effect on blood pressure. The World Health Organization makes a strong recommendation that adults increase their potassium intake from food to reduce blood pressure and the risk of cardiovascular disease, stroke, and coronary heart disease. The benefit is framed at the level of populations and general guidance, as a reduction in risk rather than a cure, and the most relevant context is that most people are below the recommended level to begin with.

The most useful way to understand potassium is alongside sodium, because the two work as a pair. The companion guide on dietary sodium describes the problem from the sodium side: most people eat far more sodium than is recommended, and high sodium intake raises blood pressure. Potassium is the other side of the same balance. When the World Health Organization issued its sodium and potassium guidance together, it framed the goal as reducing sodium and increasing potassium, noting that a person with elevated sodium and low potassium could be at risk of raised blood pressure, which increases the risk of heart disease and stroke. The two minerals are not interchangeable, but the direction of healthy eating moves both at once: less sodium, more potassium.

This is why a single dietary shift often improves both numbers. Whole and minimally processed foods, especially vegetables, fruit, beans, and other plants, tend to be naturally low in sodium and high in potassium, while heavily processed and packaged foods tend to be the reverse. Eating patterns built around whole plant foods, such as the Mediterranean dietary pattern, naturally raise potassium while lowering sodium, which is part of why such patterns are linked to better blood pressure. The same plant-forward, whole-food eating that supplies more fibre also tends to supply more potassium, so the changes reinforce one another rather than competing.

The best whole-food sources of potassium

Potassium is widespread in whole foods, which is why a varied diet built around plants, dairy, and fish supplies it naturally. According to the National Institutes of Health Office of Dietary Supplements, good sources include leafy greens such as spinach, potatoes and sweet potatoes, beans and lentils, bananas, dried fruit such as dried apricots, prunes, and raisins, avocado, dairy products such as milk and yogurt, and fish. A familiar reference point is that a medium banana has about 420 mg of potassium, though the banana is more famous for potassium than it is the richest source; potatoes, beans, and leafy greens often supply more per serving.

The pattern worth noticing is that potassium clusters in the same whole foods that nutrition guidance already encourages for other reasons. Vegetables, fruit, beans, and lentils are also major sources of dietary fibre, so the eating changes that increase fibre tend to raise potassium at the same time, a connection explored in the guide on dietary fibre. This is the food-first approach in practice: rather than tracking potassium milligrams, most people can simply eat more vegetables, fruit, beans, and other whole plant foods, with some dairy and fish, and potassium intake rises as a by-product.

The contrast with ultra-processed foods is part of the same story. Heavily processed and packaged foods tend to be lower in potassium and higher in sodium than the whole foods they replace, a trade-off discussed in the guide on ultra-processed foods. So the single most effective move for potassium is not to add a special potassium food or a supplement, but to shift the overall balance of the diet toward whole and minimally processed foods. That shift raises potassium, lowers sodium, and adds fibre at the same time, which is why it appears again and again across separate areas of nutrition guidance.

Frequently asked questions

How much potassium do I need per day?

The main reference figures are close but framed differently. The World Health Organization suggests adults consume at least 3,510 mg a day (90 mmol), a conditional recommendation, while strongly recommending that potassium intake be increased from food. In the United States the Adequate Intake is 3,400 mg a day for adult men and 2,600 mg a day for adult women, and the FDA Daily Value used on labels is 4,700 mg. These are general population references, not a personal prescription to hit exactly. Because most people consume less than the recommended level, the practical message is that most adults benefit from more potassium, ideally from food. People with kidney disease, a heart condition, or who take certain medications should follow the target their clinician sets, which may be lower.

Why do the WHO and US potassium numbers differ?

They come from different bodies using different methods, so they are best read together rather than as a single figure. The World Health Organization suggests at least 3,510 mg a day for adults, and rates this precise number as a conditional recommendation while making a strong recommendation to increase potassium from food. The United States Adequate Intake, reported by the National Institutes of Health Office of Dietary Supplements, is 3,400 mg a day for men and 2,600 mg a day for women, which is why it differs by sex where the WHO figure is a single number. The FDA Daily Value of 4,700 mg is yet another reference, used on nutrition labels rather than as a personal target. Despite the different numbers, all of them point the same way: most adults eat less potassium than recommended and would benefit from more, mainly from food.

What foods are highest in potassium?

Potassium is widespread in whole foods. According to the National Institutes of Health Office of Dietary Supplements, good sources include leafy greens such as spinach, potatoes and sweet potatoes, beans and lentils, bananas, dried fruit such as dried apricots, prunes, and raisins, avocado, dairy products such as milk and yogurt, and fish. The banana is the most famous example, with about 420 mg in a medium fruit, but it is not the richest source; potatoes, beans, and leafy greens often supply more per serving. The same whole foods are also rich in fibre, so a diet built around vegetables, fruit, beans, and other plants, with some dairy and fish, supplies plenty of potassium without any need to track it.

Does potassium help lower blood pressure?

Yes, and this is the central reason potassium features in heart-health guidance. The World Health Organization makes a strong recommendation that adults increase their potassium intake from food to reduce blood pressure and the risk of cardiovascular disease, stroke, and coronary heart disease. The effect is most useful to understand alongside sodium: increasing potassium and reducing sodium together lowers blood pressure, and a diet high in sodium and low in potassium is linked to raised blood pressure. The benefit is described at the level of populations and general guidance, as a reduction in risk rather than a cure, and an individual's response can vary. Anyone managing blood pressure or with a kidney or heart condition should follow their clinician's advice rather than treating potassium as a self-prescribed remedy.

Should I take a potassium supplement?

For most people the better approach is food rather than a supplement, because whole foods supply potassium safely and abundantly. Potassium supplements and potassium-based salt substitutes are a different matter and are not a do-it-yourself choice. For people whose kidneys do not remove potassium well, including those with chronic kidney disease, and for people taking certain medications such as potassium-sparing diuretics, ACE inhibitors, or ARBs, extra potassium from supplements or salt substitutes can raise blood potassium too high, a dangerous condition called hyperkalemia. This guide is general and educational, not personal medical advice. Anyone considering a potassium supplement or a potassium-based salt substitute, especially with a kidney or heart condition or regular medication, should speak with a healthcare professional first rather than starting one on their own.

Are potassium salt substitutes safe?

It depends entirely on the person. Many salt substitutes replace sodium chloride with potassium chloride, so they can deliver a large amount of potassium, and for healthy kidneys that is usually handled without trouble. For people with chronic kidney disease, or who take medications such as potassium-sparing diuretics, ACE inhibitors, or ARBs, the same products can push blood potassium dangerously high, which is why the National Kidney Foundation advises people in that situation to avoid certain salt substitutes. The safe rule is that a potassium-based salt substitute is not a casual swap for anyone with a kidney or heart condition or relevant medication. This guide is general and educational, not medical advice, so anyone in those groups should check with their clinician before using one.

Is it possible to get too much potassium from food?

For the general public with healthy kidneys, potassium from food is safe, because healthy kidneys remove any excess, and the World Health Organization specifically frames its advice as increasing potassium intake from food. The concern about too much potassium applies to potassium supplements and potassium-based salt substitutes, and to people whose bodies cannot clear potassium normally. When kidneys do not work as well as they should, including in chronic kidney disease, potassium can build up in the blood, which is why people in that situation may be advised to limit certain high-potassium foods under medical guidance. For everyone else, the realistic problem is too little potassium, not too much, and a varied whole-food diet is the safe and recommended way to get more.

Why do potassium and sodium get talked about together?

Because they work as a pair, especially when it comes to blood pressure. The World Health Organization issued its sodium and potassium guidance together and framed the goal as reducing sodium and increasing potassium, noting that a person with elevated sodium and low potassium could be at risk of raised blood pressure, which increases the risk of heart disease and stroke. Most people sit on the wrong side of both: too much sodium, too little potassium. The encouraging part is that one dietary shift moves both numbers, because whole and minimally processed foods tend to be low in sodium and high in potassium, while heavily processed foods tend to be the reverse. The companion guide on dietary sodium covers the sodium side of this balance in more detail.

References

1. 1Guideline: Potassium Intake for Adults and Children (2012), full text (NCBI Bookshelf NBK132453) · World Health Organization / National Library of Medicine. Accessed 2026-06-16.
2. 2Guideline: Potassium Intake for Adults and Children (2012), Executive Summary (NCBI Bookshelf NBK132458) · World Health Organization / National Library of Medicine. Accessed 2026-06-16.
3. 3WHO issues new guidance on dietary salt and potassium · World Health Organization. Accessed 2026-06-16.
4. 4Potassium: Fact Sheet for Health Professionals · National Institutes of Health, Office of Dietary Supplements. Accessed 2026-06-16.
5. 5High Potassium (Hyperkalemia) · National Kidney Foundation. Accessed 2026-06-16.