What is it potassium?

Potassium is a mineral and an electrolyte that is essential for maintaining normal cell function and fluid balance, regulating blood pressure, and facilitating muscle and nerve function in the body. It is a naturally occurring element that is found in many foods and is also available as a dietary supplement.

How does it work?

Potassium works by maintaining the balance of fluids in the body and helping to regulate heart and muscle function. It also plays a role in the proper functioning of the kidneys, muscles, and nervous system.

What are the active ingredients that are important for its medicinal properties?

The active ingredient in potassium supplements is potassium ions.

What forms does it come in?

Potassium can be found in tablet or capsule form and is also available as a liquid supplement.

What if I have an imbalance or deficiency?

Potassium deficiency, or hypokalemia, can result from a variety of factors, including kidney disease, excessive sweating, and the use of certain medications. Symptoms of deficiency include muscle weakness, fatigue, and cramps, as well as an irregular heartbeat and changes in blood pressure.

When was it first used for medicinal purposes?

Potassium has been used for medicinal purposes for thousands of years. The ancient Persians and Egyptians used potassium-rich foods and supplements to treat a wide range of health conditions, and early Persian, Greek and Roman medical texts also discussed the medicinal properties of potassium. Today, potassium is widely recognized as an essential nutrient for human health, and it is widely used in the treatment of a variety of health conditions.

What does Potassium help with?

Potassium is a mineral your body must have. Most people get it from food, such as beans, potatoes, spinach, fish, dairy and fruit. It is also sold as a supplement, and as potassium citrate.

• High blood pressure
  Strong evidence — many randomised trials in people, in line with each other. In randomised human trials, people who took in more potassium had lower blood pressure. The drop was biggest in people whose diets were high in salt. Human studies trace this to more sodium leaving through the kidneys, and to looser blood vessel walls.
  Evidence grade A · Traditional tier T0
• Kidney stones that keep coming back
  Good evidence — human trials of potassium citrate in repeat stone formers. In human studies, potassium citrate raised the pH of urine, so it was less acidic. Less acid urine makes calcium-oxalate and uric acid stones harder to form. Doctors prescribe this form as an option for people who form stones again and again.
  Evidence grade B · Traditional tier T0
• Stroke risk
  Early evidence — large studies that followed people over years, not randomised trials. In these long follow-up studies, people who ate more potassium had fewer strokes. The link was clearest for the common clot type. This kind of study cannot prove cause, and much of the effect may simply be lower blood pressure.
  Evidence grade C · Traditional tier T0
• Muscle cramps and weakness
  Early evidence — clinical reports in people with proven low potassium; no randomised trials on file. Muscles are known to need potassium to tighten and then fully relax. Doctors see cramps and weakness when levels fall after heavy sweating, vomiting or diarrhoea. In those cases, replacing potassium eased the problem within a day or two.
  Evidence grade C · Traditional tier T0
• Irregular heartbeat
  Early evidence — patient studies of low potassium plus standard hospital practice. Potassium is well established to carry the electric signals that time each heartbeat. In patient studies, low levels went hand in hand with odd heart rhythms. Keeping levels normal is a standard part of heart care, above all for people on some heart or blood pressure drugs.
  Evidence grade C · Traditional tier T0
• Bone loss with age
  Early evidence — short human studies that measured calcium in urine. In these studies, diets rich in potassium from fruit and veg cut the calcium lost in urine. Whether that saves bone over many years is not settled. Interest is highest for older adults and for women past menopause.
  Evidence grade C · Traditional tier T0
• Blood sugar and type 2 diabetes
  Evidence doesn't support this — observational links only; no randomised trials on file. Some studies that tracked people found higher potassium intake alongside better insulin action. Other work linked low potassium with weaker insulin release. None of this shows that taking more potassium changes blood sugar.
  Evidence grade D · Traditional tier T0
• Water retention and bloating
  Evidence doesn't support this — known body chemistry, but weak direct human data. It is well established that potassium and sodium balance each other in the body. Some evidence suggests that more potassium leads the kidneys to hold less water. Trials that measured puffiness or bloating as the outcome are not on file here.
  Evidence grade D · Traditional tier T0
• Tiredness and low energy
  Evidence doesn't support this — seen when potassium is low; no trials in people with normal levels. Feeling tired, weak or foggy is a known sign of low potassium. When doctors corrected a real shortfall, energy often picked up. No study on file shows extra potassium lifts energy when your level is already normal.
  Evidence grade D · Traditional tier T0

What Potassium has not been shown to do

• No study on file shows potassium pills raise energy in people whose levels are already normal.
• It has not been shown to lower blood sugar or to treat type 2 diabetes.
• It has not been shown to prevent broken bones or to reverse osteoporosis.
• It has not been shown to ease cramps in people whose potassium is normal.
• It has not been shown to cause weight loss; shifting water is not losing fat.
• No trial on file shows it eases bloating or puffiness as a measured outcome.

How to read this:

Grade A means many randomised human trials agree. B means at least one good human trial. C means small, mixed or early human studies. D means the human evidence is weak or conflicting. Insufficient means lab, animal or tradition only. This page reports what studies found. It is not medical advice. Potassium can build up in people with kidney disease or on certain heart and blood pressure drugs, so ask your doctor first. Do not stop prescribed medicine based on this page.

What can Potassium help prevent?

• Stroke: higher dietary potassium intake is consistently associated with meaningfully lower stroke risk across large population studies
• Kidney stones (calcium-oxalate and uric acid types): potassium citrate is clinically established as a preventive treatment
• Hypertension-related cardiovascular disease: maintaining adequate potassium is a recognized strategy for reducing long-term cardiovascular risk
• Hypokalemia (potassium deficiency): particularly important for people on diuretics, those with chronic diarrhea, or athletes with heavy sweat losses

Which foods are rich in it?

1. Bananas
2. Sweet potatoes
3. Avocados
4. White beans
5. Salmon
6. Yogurt
7. Spinach
8. Tomatoes
9. Winter squash
10. Oranges

What are possible side effects?

High doses of potassium can cause:

• Stomach upset
• Nausea
• Diarrhea

In rare cases, high doses can also lead to more serious side effects, such as heart palpitations and muscle weakness.

What’s the recommended daily dose?

The recommended daily dose of potassium for adult men and women is about 4,700 mg per day.

How many days does it take to work?

The effects of potassium supplementation may vary, but it usually takes a few days to several weeks to see improvement in symptoms.

What time of day is best to take it?

Potassium can be taken at any time of day, but it is best to take it with a meal to minimize the risk of stomach upset.

Is it best to take it with or without food?

It is best to take potassium with food to minimize the risk of stomach upset.