Reducing sodium works. But blood pressure is influenced by the other side of the mineral balance too—and potassium deserves more attention than it usually gets.
Ask which mineral matters most for blood pressure, and sodium will probably come to mind first.
There is good reason for that. Reducing sodium lowers blood pressure, particularly in people whose blood pressure is already elevated. “Eat less salt” has become one of the most familiar pieces of cardiovascular advice.
But it leaves out half of an important nutritional relationship.
The other half is potassium.
Randomized trials show that increasing potassium can lower blood pressure too, with larger effects generally seen in people with hypertension. And some of the most compelling evidence comes from an unusually simple intervention: researchers replace part of the sodium chloride in ordinary salt with potassium chloride.
Blood pressure falls.
That does not mean sodium and potassium can be given matching importance scores, or that eating more potassium somehow cancels out a high-sodium diet. It points to a more useful idea: blood pressure is influenced not only by how much sodium a diet contains, but also by what is happening on the potassium side.
Blood Pressure Isn’t Only a Sodium Story
Sodium deserves its reputation.
A 2024 umbrella review covering 56 systematic reviews and meta-analyses found moderate-to-high-certainty evidence that reducing sodium lowers systolic blood pressure across populations with different levels of cardiovascular risk. The size of the effect varied, including according to whether people already had hypertension.
Bringing potassium into the picture does not weaken that evidence. It completes it.
Potassium participates in several processes involved in blood-pressure regulation, including helping the kidneys excrete sodium and influencing blood-vessel function. That does not make potassium an antidote to sodium, but it does give researchers a reason to ask whether increasing potassium can lower blood pressure independently.
Controlled trials suggest that it can.
A 2025 dose-response meta-analysis of randomized trials found a striking difference according to participants’ starting blood pressure. For an increase in potassium corresponding to a 50 mmol-per-day rise in urinary potassium, the estimated reduction in systolic blood pressure was only about 0.5 mmHg among people without hypertension, compared with about 5.3 mmHg among those with hypertension.
Those numbers are averages, not predictions for an individual, and relatively few trials were available for the dose-response analysis. But the contrast makes an important point:
There is no single “potassium effect” that applies equally to everyone.
Earlier randomized evidence found a similar pattern, with stronger blood-pressure reductions among people with hypertension and those consuming more sodium. It also suggested that the relationship is not simply “more potassium is always better,” particularly at high supplemental intakes.
So potassium is not a hidden blood-pressure switch. Its effect depends partly on the dietary and metabolic situation into which it is added.
That is where sodium and potassium become more interesting together.
Salt Substitutes Change Both Sides at Once
Ordinary table salt is primarily sodium chloride.
Potassium-containing salt substitutes replace some of that sodium chloride with potassium chloride. Each time the substitute replaces regular salt, sodium intake falls while potassium intake rises.
That makes these products a real-world test of what happens when the sodium-potassium pattern shifts in both directions.
A 2026 network meta-analysis combined 34 randomized trials involving more than 37,000 participants in 15 countries. Compared with regular salt, potassium-containing, lower-sodium salt substitutes consistently lowered blood pressure. Formulations containing moderate amounts of potassium reduced systolic blood pressure by roughly 4.4 to 4.6 mmHg.
A separate 2026 umbrella review reached much the same conclusion. It examined 11 previous systematic reviews of potassium-containing, lower-sodium salt substitutes, and every pooled estimate favored the substitutes for systolic blood pressure.
That consistency is important.
But these trials cannot tell us that potassium deserves all the credit—or sodium reduction does. Both changed simultaneously.
For the practical question, that may be less of a problem than it sounds. The intervention improves the overall sodium-potassium pattern, and blood pressure responds.
In other words, sodium and potassium do not need to compete for the title of “more important” for both to matter.
Lower Blood Pressure Is One Thing. Fewer Heart Attacks and Strokes Is Another.
Blood pressure matters largely because persistently high blood pressure increases cardiovascular risk. So an obvious question follows: do potassium-containing salt substitutes also prevent cardiovascular events or deaths?
The evidence is encouraging, but it needs more context than the blood-pressure findings.
The 2026 network meta-analysis found that moderate-potassium, lower-sodium salt substitutes probably reduced all-cause mortality, cardiovascular mortality, and nonfatal cardiovascular events compared with regular salt in the populations studied.
Much of that evidence, however, rests on one exceptionally large trial: the Salt Substitute and Stroke Study (SSaSS), which enrolled nearly 21,000 people in rural China. When that trial was removed from the 2026 network meta-analysis, the statistically significant reduction in all-cause mortality disappeared. The analysis also noted that studies outside China did not contribute mortality data.
That matters because the way people get their sodium differs across countries and diets.
In communities where a large share of sodium comes from salt added during cooking or at the table, changing the household salt can meaningfully change total intake.
In the United States, more than 70% of dietary sodium comes from packaged, prepared, and restaurant foods. Changing the salt shaker therefore cannot address most sodium exposure for many Americans.
So the cardiovascular findings are promising, but they should not be assumed to transfer perfectly to every population.
The blood-pressure conclusion is firmer: when potassium-containing salt substitutes replace regular salt, blood pressure tends to fall.
Potassium-Rich Foods and Potassium Salt Aren’t the Same Thing
There is another distinction that can easily disappear once the message becomes “get more potassium.”
Eating potassium-rich foods, taking a potassium supplement, and replacing regular salt with potassium chloride are not interchangeable strategies.
Many ordinary foods provide potassium, including beans and lentils, potatoes, leafy vegetables, fruit, dairy foods, and fish. Increasing these foods can raise dietary potassium without turning potassium into an isolated supplement.
Potassium-containing salt substitutes are different. They can provide a concentrated source of potassium chloride, which makes safety more important.
For most healthy people, the kidneys regulate blood potassium effectively. But people with kidney disease or other conditions that impair potassium handling can develop dangerously high potassium levels. Certain medications can also increase that risk.
For that reason, the American Heart Association advises people with kidney disease or those taking medications that affect potassium to consult a healthcare professional before using potassium-based salt substitutes or over-the-counter potassium supplements.
Trial results do not eliminate that concern. The 2026 umbrella review found no clear increase in hyperkalemia across pooled salt-substitute trials, but many studies excluded people at increased risk of impaired potassium handling. Safety in those study populations does not establish safety for everyone.
So the potassium evidence is not an argument to start taking supplements or replacing salt indiscriminately.
It is an argument for thinking about blood-pressure nutrition more completely.
So, Is Potassium as Important as Cutting Sodium?
There is no scientifically useful way to declare sodium reduction and potassium intake universally equal. Their effects depend on starting blood pressure, baseline diet, health status, and how the dietary change is made.
But the familiar focus on sodium alone is incomplete.
Reducing excess sodium lowers blood pressure. Increasing potassium can lower it too, with larger effects generally seen among people who already have hypertension. And when researchers improve both sides of the equation at once—replacing some sodium chloride with potassium chloride—blood pressure falls consistently.
None of that makes a high-sodium diet harmless if it contains plenty of potassium.
It does mean that “eat less sodium” is only part of the nutritional picture.
For most people, the practical implication is not to chase potassium pills. It is to recognize that a blood-pressure-friendly eating pattern can move in two useful directions at once: away from excessive sodium and toward foods that naturally provide potassium.
Sodium deserves its place in the blood-pressure conversation.
Potassium belongs there too.
