Does Eating More Potassium Lower Blood Pressure?

Dozens of clinical trials show that getting more potassium lowers blood pressure, especially for people with hypertension or high-salt diets.

Published October 2026

Short answer

Yes. Clinical trials consistently show that increasing potassium intake lowers blood pressure, with the clearest benefits seen in people with hypertension and those consuming higher amounts of sodium. Evidence grade A (Strong). Consistent systematic reviews and meta-analyses of dozens of randomised controlled trials in humans measuring blood pressure directly show clear reductions, particularly in hypertension.

Key takeaways

In a Cochrane review of 20 randomised trials with over 21,000 adults, switching to potassium-enriched salt reduced systolic blood pressure by an average of 4.8 mm Hg and diastolic by 2.4 mm Hg [1].
A landmark World Health Organization review found that higher potassium intake reduced systolic blood pressure by 3.5 mm Hg overall and by 7.2 mm Hg in people with hypertension [2].
The blood-pressure-lowering effect is strongest in people who consume high amounts of sodium or who have low baseline potassium intake [3][4].
Excess potassium supplementation above roughly 3,500 mg per day provides little extra benefit and poses severe risks for individuals with impaired kidney function [4][5].

The short version

Eating more potassium consistently lowers blood pressure, with the largest drops occurring in people diagnosed with hypertension and those whose diets are high in sodium [2][4]. Systematic reviews and meta-analyses covering dozens of randomised controlled trials show that increasing daily potassium intake—either through whole foods or potassium-enriched salt substitutes—lowers systolic blood pressure by roughly 3.5 to 5 mm Hg [2][1]. While healthy kidneys readily excrete surplus mineral, individuals with kidney disease or those taking medications that retain potassium should avoid supplements and talk to a doctor first [5].

What the studies show

The evidence connecting potassium intake to lower blood pressure is among the strongest in nutrition science. In a 2022 Cochrane systematic review of 20 randomised trials involving 21,414 adults, replacing ordinary table salt with potassium-enriched salt substitutes lowered systolic blood pressure by an average of 4.76 mm Hg and diastolic blood pressure by 2.43 mm Hg [1]. A pooled analysis of 21 trials with 31,949 participants similarly found an average systolic drop of 4.61 mm Hg and demonstrated clear protective effects on overall mortality, cardiovascular deaths, and non-fatal strokes [6].

These findings align with classic landmark research conducted for the World Health Organization [2]. In that systematic review of 22 randomised controlled trials, higher potassium intake reduced systolic blood pressure by 3.49 mm Hg and diastolic blood pressure by 1.96 mm Hg in adults [2]. When daily potassium intake reached 90 to 120 mmol (approximately 3,500 to 4,700 mg), systolic pressure dropped by 7.16 mm Hg among participants with hypertension [2].

Even among individuals with normal baseline readings, potassium exerts a modest balancing effect. A 2023 meta-analysis of trials in normotensive adults found that potassium supplementation lowered systolic blood pressure by 2.10 mm Hg [7], with sustained reductions of 2.80 mm Hg observed when interventions lasted longer than one month [8].

The nuances

The magnitude of the blood pressure benefit depends heavily on two factors: baseline blood pressure and sodium intake [3][4]. In a dose-response meta-analysis of 32 randomised trials, researchers found that potassium lowered blood pressure most dramatically in participants with untreated hypertension and in those consuming substantial amounts of sodium [4]. Because potassium promotes sodium excretion through the kidneys and encourages blood vessel walls to relax, a high sodium-to-potassium ratio magnifies the benefits of adding potassium [9].

Doses beyond what is naturally obtained from a balanced diet do not appear to provide extra benefit [4]. The dose-response analysis identified a U-shaped curve where blood-pressure reductions plateaued above differences of 30 mmol per day (roughly 1,170 mg of added potassium), with no further reduction at higher intakes [4].

Food sources provide potassium alongside fiber, magnesium, and polyphenols without the gastrointestinal irritation sometimes caused by high-dose potassium chloride tablets [10]. In a controlled crossover trial comparing potassium from baked or boiled potatoes against potassium gluconate supplements, dietary potassium from potatoes achieved a significantly greater reduction in systolic blood pressure over time (-6.0 mm Hg vs -2.6 mm Hg) [10].

Safety represents the most critical nuance [5]. For people with healthy kidneys, the body efficiently clears extra potassium in the urine [2]. However, in people with chronic kidney disease, impaired renal function hinders potassium clearance [5]. In a feeding trial of 29 adults with stage 3 kidney disease, a higher potassium diet led to confirmed hyperkalemia (abnormally high blood potassium) in two participants [5]. Elevated blood potassium can trigger dangerous cardiac rhythm abnormalities [1].

What this means for you

If you are looking to support healthy blood pressure, increasing your dietary potassium intake is an effective and well-supported strategy [2][1].

Most public health bodies, including the World Health Organization, recommend aiming for at least 3,500 mg of potassium daily from whole foods [2]. Excellent food sources include baked potatoes with the skin, white and black beans, spinach, Swiss chard, avocados, bananas, plain yogurt, and fish [10].

Another practical option supported by clinical trials is using a potassium-enriched salt substitute in place of standard table salt for home cooking [11][1]. These products typically replace 25% to 30% of sodium chloride with potassium chloride, delivering a dual benefit: lowering sodium while raising potassium [11][6].

Do not take over-the-counter potassium supplements or use potassium-enriched salt substitutes without consulting your healthcare provider if you have kidney disease, heart failure, or take blood pressure medicines such as ACE inhibitors, angiotensin receptor blockers, or potassium-sparing diuretics [5][1]. For a complete list of medical interactions and safety guidelines, check our Potassium topic page.

Go deeper

Potassium — Eating more potassium consistently lowers blood pressure, especially in people with hypertension and high salt intake.