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K9.0
Potassium Research
Probably helpsModerate safety
24 peer-reviewed studies
What the evidence says
Probably helps
Potassium helped in about half (6/10) of the studies that measured an effect — promising, but not unanimous.
Most evidence is from high-quality meta-analyses and randomised trials published 2013–2026 with a typical study size of 1,430 participants.
Based on 24 studies · 13 meta-analyses · 8 RCTs · 340,345 total participants
Confidence
High
What the studies found
6helped4unclear· 14 more without graded effect data
2Meta-AnalysisCited 15×n=237,036 · very large study2024
Our study demonstrates significant positive associations between daily sodium intake (within the range of sodium intake between 2,000 and 7,500 mg/d), the sodium-potassium ratio, and risk of CVD and overall mortality, with women having stronger sodium-potassium ratio-mortality associations than men, and with the meta-analysis providing compelling support for the CVD associations.
6Blood pressure reductionMeta-AnalysisCited 113×n=923 · large study2020
Aerobic exercise, isometric training, low-sodium and high-potassium salt, comprehensive lifestyle modification, salt restriction, breathing-control, meditation and low-calorie diet also have obvious effects on BP reduction.
Fu J et al. · Journal of the American Heart Association (2020)
Among overweight and obese participants, low-calorie diet and low-calorie diet plus exercise could lower more BP than exercise.
Conclusions DASH might be the most effective intervention in lowering BP for adults with prehypertension to established hypertension.
Aerobic exercise, isometric training, low-sodium and high-potassium salt, comprehensive lifestyle modification, salt restriction, breathing-control, meditation and low-calorie diet also have obvious effects on BP reduction.
7Global mean potassium intakeMeta-AnalysisCited 48×n=104 · medium study2023
Global mean potassium intake (2.25 g/day) falls below current guideline recommended intake level of > 3.5 g/day, with only 14% (95% CI 11-17%) of the global population achieving guideline-target mean intake.
Reddin C et al. · European journal of nutrition (2023)
No clear effect
← WorseNo effectBetter →
Approximately 31% (95% CI, 30-41%) of global population included have an estimated potassium intake > 2.5 g/day, with 14% (95% CI 11-17%) above 3.5 g/day.
Global mean potassium intake (2.25 g/day) falls below current guideline recommended intake level of > 3.5 g/day, with only 14% (95% CI 11-17%) of the global population achieving guideline-target mean intake.
There was considerable regional variation, with lowest mean potassium intake reported in Asia, and highest intake in Eastern and Western Europe.
Both supplements demonstrated greater reductions in SBP for the general population at lower dosages and longer treatment durations.
Behers BJ et al. · Nutrients (2024)
Both supplements demonstrated greater reductions in SBP for the general population at lower dosages and longer treatment durations.
Future studies are needed to validate these findings and provide tailored recommendations.
These studies could investigate varying dosages over long-term follow-up to provide robust data on optimal dosages and treatment durations, as our findings were limited due to reliance on previously published trials.
9Obesity and metabolic syndrome riskMeta-AnalysisCited 61×2016
However, additional pertinent studies are needed to examine the underlying mechanism.
Cai X et al. · Nutrients (2016)
No clear effect
← WorseNo effectBetter →
The results of the pooled analysis and systematic review indicated that high potassium intake could not reduce the risk of obesity (pooled OR = 0.78; 95% CI: 0.61-1.01), while serum potassium and urinary sodium-to-potassium ratio was associated with obesity.
Potassium intake was associated with metabolic syndrome (pooled OR = 0.75; 95% CI: 0.50-0.97).
Nonlinear analysis also demonstrated a protective effect of adequate potassium intake on obesity and metabolic syndrome.
10blood pressure, cardiovascular events and mortalityMeta-Analysisn=37,063 · very large study2026
Salt substitutes, particularly moderate-potassium and low-sodium formulations, represent a promising sodium reduction strategy.
Lai H et al. · BMC medicine (2026)
Salt substitutes, particularly moderate-potassium and low-sodium formulations, represent a promising sodium reduction strategy.
However, current evidence for mortality and cardiovascular event benefits is dominated by one large Chinese trial and has very limited generalisability beyond Chinese populations with high discretionary salt use.
These products appear acceptable and safe in people without renal impairment, but clinicians should rule out kidney disease and hyperkalaemia risk before recommending them, and large trials in non-Chinese populations are needed.
Hoorn EJ et al. · Nature reviews. Nephrology (2026)
However, whether the cardiorenal benefits of adequate potassium intake in CKD outweigh the risk of hyperkalaemia remains uncertain.
A clearer understanding of the relationship between dietary potassium intake and blood potassium levels, as well as the optimal blood potassium range for kidney and cardiovascular health, is needed to resolve this question.
12Potassium intake associated with Mediterranean diet adherenceSystematic Reviewn=263 · medium study2026
Higher MDP adherence is generally associated with higher potassium intake, but estimates vary by how MDP adherence is defined and scored, the potassium assessment method, and population context.
D'Elia L et al. · Nutrients (2026)
Higher MDP adherence is generally associated with higher potassium intake, but estimates vary by how MDP adherence is defined and scored, the potassium assessment method, and population context.
Current evidence remains insufficient to quantify potassium's potential contribution as a candidate mediator without formal mediation analyses and robust exposure assessment, including repeated validated 24 h urine collections.
Standardised scoring, routine reporting of potassium, sodium, and the Na/K ratio, and triangulation across dietary, biomarker and intervention evidence are key priorities to strengthen inference.
13hyperkalemia-related treatment rateRCTn=14,989 · very large study2026
This rct examined the effects of Potassium.
Lin C et al. · Nature communications (2026)
No clear effect
← WorseNo effectBetter →
Could be chance
Overall, the rate of hyperkalemia-related treatment was not significantly greater in the intervention group (8.0%) than in the control group (7.7%) (hazard ratio 1.05; 95% CI 0.94-1.17; p = 0.420).
Similarly, the rate of hypokalemia-related treatment did not differ significantly (2.1% vs. 2.4%; hazard ratio 0.91; 95% CI 0.74-1.13; p = 0.392).
Among patients identified by AI-enabled electrocardiography as having hyperkalemia, however, hyperkalemia-related treatment occurred more frequently in the intervention group (69.1% vs. 41.6%; hazard ratio 2.23; 95% CI 1.44-3.46; p < 0.001).
In patients with hypertension, the use of a salt substitute is associated with a significant reduction in both SBP and DBP compared with regular salt.
Kelly FA et al. · Arquivos brasileiros de cardiologia (2026)
Four RCTs involving 1,430 participants were included, of whom 725 (49.57%) received the salt substitute.
The use of a salt substitute was associated with a significant reduction in systolic BP (SBP) (MD, -5.75 mmHg; 95% CI, -6.98 to -2.39 mmHg; I2 = 37%; p < 0.01) and a significant reduction in diastolic BP (DBP) (MD, -1.62 mmHg; 95% CI, -2.34 to -0.91 mmHg; I2 = 0%; p < 0.001).
In patients with hypertension, the use of a salt substitute is associated with a significant reduction in both SBP and DBP compared with regular salt.
15Insomnia severity and sleep hormone levelsRCTCited 7×n=320 · medium study2024
The study revealed that magnesium, potassium, and magnesium and potassium combined had a significant effect on serum cortisol and melatonin levels (sleep hormones).
Khalid S et al. · Frontiers in endocrinology (2024)
The study included 93 (32.1%) male and 197 (67.9%) female participants.
According to the analysis, there was a significant association between the treatment groups and ISI after the trial (post-trial), p = 0.0001.
The study revealed that magnesium, potassium, and magnesium and potassium combined had a significant effect on serum cortisol and melatonin levels (sleep hormones).
16Red blood cell potassium uptake and kaliuresisRCTCited 7×n=18 · very small study2023
With similar plasma potassium increase, red blood cell potassium uptake and kaliuresis were higher after an acute load of potassium citrate as compared with potassium chloride alone or pretreatment with lisinopril.
Wouda RD et al. · Clinical journal of the American Society of Nephrology : CJASN (2023)
With similar plasma potassium increase, red blood cell potassium uptake and kaliuresis were higher after an acute load of potassium citrate as compared with potassium chloride alone or pretreatment with lisinopril.
The study suggests that magnesium alone and magnesium coupled with potassium supplementation assist insomniac diabetics more effectively to regulate insulin resistance and increased blood sugar levels.
Khalid S et al. · Journal of investigative medicine : the official publication of the American Federation for Clinical Research (2026)
HOMA-IR analysis showed that pretreatment mean of T4 (Magnesium + Potassium group) was 3.01 ± 0. 54, and post-treatment mean was 2.54 ± 0.29, showing a significant reduction (p = 0.001).
There was a significant association among post-HOMA-IR scores of treatment groups (p = 0.001).
Fasting blood sugar levels showed that all groups, except placebo, had significant differences in levels (p = 0.001).
18Systolic blood pressureRCTn=608 · large study2026
Individuals classified as responsive or resistant to potassium-enriched salt during initial exposure did not differ in their response to subsequent exposure.
Kissock K et al. · Hypertension (Dallas, Tex. : 1979) (2026)
Noticeable benefit
← WorseNo effectBetter →
Borderline
Mean effects on SBP of potassium-enriched salt compared with regular salt over 12 months post-randomization were -2.2 mm Hg for apparently sensitive and -7.2 mm Hg for apparently resistant individuals, with no difference between the 2 groups (P=0.068).
Individuals classified as responsive or resistant to potassium-enriched salt during initial exposure did not differ in their response to subsequent exposure.
Assmus AM et al. · Journal of the American Society of Nephrology : JASN (2025)
In addition, the modern diet is also characterized by low potassium (K + ) content and recent guidelines propose increasing K + intake as an alternative or complementary measure to reducing salt intake for lowering of BP.
Most beneficial effects of K + supplementation on BP involve a homeostatic response of the kidney to dietary-induced changes in extracellular K + concentrations, particularly decreased reabsorption of NaCl in the distal convoluted tubule.
However, the effects of greater K + intake on BP are not linear, and the ideal K + supplementation or intake for management of BP remains unclear.