Is a banana a day enough to lower blood pressure?

One food will not do it alone. Adequate intake is 2,600 mg a day for women and 3,400 mg a day for men, so potassium needs to come from many fruits, vegetables, beans, and dairy foods across the day. Eating patterns like DASH are built to reach that level.

Can I use a potassium salt substitute if I take lisinopril or losartan?

Ask your clinician first. MedlinePlus tells people on lisinopril to talk to their doctor before using potassium-containing salt substitutes. The 2025 AHA/ACC guideline says blood potassium monitoring is indicated for people on ACE inhibitors or ARBs who use them.

Do salt substitutes taste different from regular salt?

Potassium salt tastes similar to regular salt, but the AHA notes it can have a bitter aftertaste when heated.

What does high potassium feel like?

Often it causes no symptoms at all, which is why blood tests matter. When symptoms occur, MedlinePlus lists chest pain, trouble breathing, nausea, palpitations, and a slow, weak, or irregular pulse. Sudden collapse is an emergency.

Why do some blood pressure pills lower potassium instead of raising it?

Diuretics (water pills) can remove potassium from the body, and MedlinePlus lists them as a cause of low potassium. Low potassium can itself cause weak muscles, abnormal heart rhythms, and a slight rise in blood pressure. Your clinician may check levels and prescribe replacement if needed.

Do Potassium Supplements Or Salt Substitutes Lower Blood Pressure?

The short answer: Yes, for many people with high blood pressure. More potassium lowered systolic pressure by about 3.5 mm Hg in a large meta-analysis, and the effect showed up in people with hypertension. Potassium-enriched salt substitutes did more than lower pressure in one large trial: they cut stroke, major cardiovascular events, and death. The catch is safety. If you have kidney disease or take an ACE inhibitor, ARB, or potassium-sparing diuretic, extra potassium can push your blood level too high.

How does potassium affect blood pressure?

Sodium and potassium work as a pair. The 2022 Cochrane review of salt substitutes notes that diets high in sodium and low in potassium both contribute to raised blood pressure. Most advice focuses on cutting sodium. Potassium is the other half of the same balance. Adding it does not replace your sodium targets.

The best-known evidence on potassium alone is a 2013 BMJ systematic review led by World Health Organization staff. It pooled 22 randomized trials with 1,606 participants. The main findings:

Higher potassium intake lowered systolic pressure by 3.49 mm Hg and diastolic pressure by 1.96 mm Hg in adults.
The effect appeared in people with hypertension, not in people without it.
When intake reached 90 to 120 mmol a day, systolic pressure fell by 7.16 mm Hg.
In 11 cohort studies, higher potassium intake was linked to a 24% lower risk of stroke.

The same review found no harm to kidney function, blood lipids, or stress hormones in adults. The authors limited that conclusion to people without impaired kidney handling of potassium.

Is potassium from food better than a supplement?

For most people, food comes first. The 2025 AHA/ACC high blood pressure guideline gives potassium its strongest rating (Class 1). It recommends moderate potassium supplementation, below 80 mmol a day, "ideally from dietary sources," for adults with elevated blood pressure or hypertension.

MedlinePlus lists the richest sources as vegetables and fruit. Beans, lentils, tomatoes, potatoes with the skin, sweet potatoes, soy, and winter squash rank high. So do citrus, cantaloupe, bananas, kiwi, prunes, and apricots. Milk, yogurt, and nuts add more. A DASH-style eating pattern is built around these foods.

Pills are a different matter. Under an FDA policy in 21 CFR 201.306, coated tablets that supply 100 mg or more of potassium are marketed with prescription labeling. They also carry a warning about small-bowel lesions that have caused obstruction, bleeding, and perforation. The required warning says coated potassium tablets should be used only when enough potassium from diet is not practical.

In practice, prescription potassium is usually for replacing losses. MedlinePlus explains that diuretics and some illnesses remove potassium from the body, and supplements replace it. That is a different goal from lowering blood pressure, and it needs a clinician to set the dose.

How much potassium do adults need?

Two numbers show up, and they measure different things.

Adequate intake: The National Academies set 3,400 mg a day for men and 2,600 mg a day for women aged 19 and older, as listed by MedlinePlus.
Daily Value: The FDA Daily Value for potassium is 4,700 mg. This is the number behind the %DV on Nutrition Facts labels, and potassium must be listed on those labels.

The FDA calls 20% DV or more per serving high. That makes label reading a simple way to find potassium-rich packaged foods. For whole foods and calorie context, calories.md covers nutrient lookups.

What did the large salt substitute trials find?

A potassium-enriched salt substitute swaps part of the sodium chloride for potassium chloride. It lowers sodium and raises potassium in one step. Two large randomized trials tested this in China.

SSaSS (2021). The Salt Substitute and Stroke Study in the New England Journal of Medicine enrolled 20,995 people from 600 rural villages. Participants had a history of stroke or were 60 or older with high blood pressure. The substitute was 75% sodium chloride and 25% potassium chloride. Over a mean 4.74 years of follow-up:

Stroke fell from 33.65 to 29.14 events per 1,000 person-years (rate ratio 0.86).
Major cardiovascular events fell from 56.29 to 49.09 per 1,000 person-years (rate ratio 0.87).
Death fell from 44.61 to 39.28 per 1,000 person-years (rate ratio 0.88).
Serious adverse events attributed to high potassium were not significantly higher (3.35 vs 3.30 per 1,000 person-years).

DECIDE-Salt (2023). This cluster-randomized trial in Nature Medicine covered 48 elderly care facilities and 1,612 residents aged 55 or older. The substitute lowered systolic pressure by 7.1 mm Hg and cut cardiovascular events (hazard ratio 0.60). It did not change total mortality. It did raise serum potassium and caused more lab-defined high potassium, without adverse clinical outcomes.

The Cochrane review pooled 26 trials. Salt substitutes probably lowered systolic pressure by 4.76 mm Hg and diastolic by 2.43 mm Hg, with moderate certainty. Blood potassium rose by 0.12 mmol/L on average. One limit matters a lot: all 26 trials excluded people for whom extra potassium is known to be harmful.

Who should not use potassium supplements or salt substitutes?

Your kidneys clear extra potassium. When they cannot, or when a drug slows that process, potassium builds up. MedlinePlus says high potassium often causes no symptoms. When it does, it can cause palpitations, a slow or irregular pulse, and sudden collapse. Talk to your clinician before adding potassium if any of these apply:

Chronic kidney disease. People on dialysis in particular are told to limit potassium-rich foods.
ACE inhibitors or ARBs. The MedlinePlus lisinopril page says to talk to your doctor before using salt substitutes containing potassium.
Potassium-sparing diuretics and MRAs. The guideline names amiloride, triamterene, spironolactone, eplerenone, and finerenone. MedlinePlus lists potassium supplements as an interaction with spironolactone.
Some immunosuppressants, such as cyclosporine and tacrolimus.
Addison disease, which reduces the kidneys' ability to remove potassium.

Our guide to blood pressure medication classes explains which class you may be on. The guideline does not ban substitutes for these groups. It says serum potassium monitoring is indicated. That makes this a decision to make with your care team, not on your own.

How do you pick a salt substitute that actually helps?

The guideline recommendation (Class 2a) applies to products with 25% to 30% potassium chloride and 65% to 75% sodium chloride. It is aimed particularly at people whose salt comes mostly from cooking and seasoning at home. Products called "salt substitutes" that do not use potassium chloride have unknown effects on blood pressure, according to the guideline.

Few Americans use them. An AHA analysis of national survey data, presented as a preliminary abstract in 2025, found that less than 6% of U.S. adults use salt substitutes. The AHA release also notes that potassium salt can taste bitter when heated.

A shaker swap does not change the sodium already in restaurant meals and packaged foods. For more on supplement safety, see supplements.md, and ask your pharmacist about interactions with your current drugs.

The bottom line

More potassium lowers blood pressure in people with hypertension, and potassium-enriched salt substitutes cut strokes and deaths in a trial of nearly 21,000 people. Food is the preferred source, and a 25% potassium chloride salt is a reasonable swap for many home cooks. Coated potassium pills with 100 mg or more need a prescription and are meant for when diet is not enough. Kidney disease and drugs like ACE inhibitors, ARBs, and spironolactone change the risk, so check with your clinician first.

Last updated: September 2026. This article is for informational purposes only and does not constitute medical advice. Talk to your doctor or pharmacist before starting potassium supplements or salt substitutes, especially if you have kidney disease or take blood pressure medication.