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Potassium (K)
Primary intracellular electrolyte that regulates blood pressure, nerve transmission, and muscle contraction — works in balance with sodium.
What the evidence says
Potassium helped in about half (2/3) of the studies that measured an effect — promising, but not unanimous.
Most evidence is from high-quality meta-analyses and randomised trials published 1965–2026 with a typical study size of 14,923 participants.
Based on 185 studies · 25 meta-analyses · 144 RCTs · 2,106,921 total participants
Confidence
High confidenceWhat the studies found
By outcome
An essential mineral with numerous meta-analyses of RCTs showing it lowers blood pressure in people with hypertension, and cohort data linking higher intake to lower stroke risk, earning a Very Strong rating despite hyperkalemia caution in kidney/medication contexts.
344 trials ongoing or recruiting · NaN completed on ClinicalTrials.gov
334 of the completed trials have posted results
Registered trials show research momentum for Potassium, not proof of effect — a registration is a plan, and posted results are sponsor-reported, not peer-reviewed. They are never counted toward the evidence rating above.
Browse these trials on ClinicalTrials.govClinicalTrials.gov · as of Oct 2026
Under EU law (Reg. 1924/2006), EFSA reviews whether a specific health claim for Potassium meets the evidence standard. These are independent regulatory decisions on claims — not studies, and never counted toward the evidence score above.
Authorised claims
“Potassium contributes to normal functioning of the nervous system”
“Potassium contributes to normal muscle function”
“Potassium contributes to the maintenance of normal blood pressure”
“Not authorised” means the specific claim wording did not meet the EU’s evidence standard — often a matter of dossier or phrasing, not proof of no effect. EFSA judges marketing claims and is kept separate from our study-based evidence score.
Source: EU Register of nutrition and health claims (European Commission / EFSA) · register snapshot Feb 2013
Potassium is the primary intracellular cation and one of the most important electrolytes in the body. It's essential for maintaining proper fluid balance, nerve transmission, muscle contraction, and blood pressure regulation. Most people don't get enough potassium from diet alone.
Higher potassium intake is strongly associated with lower blood pressure and reduced stroke risk. Works in balance with sodium.
Promotes sodium excretion and vasodilation
Essential for muscle contraction
Required for nerve impulse transmission
How Potassium works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
AVOID supplementation; potassium can accumulate to dangerous levels
May need more due to sweat losses; replenish during exercise
ACE inhibitors lower aldosterone and reduce potassium excretion, so a potassium supplement can cause hyperkalaemia. The labels advise against potassium supplements and potassium salt substitutes unless the prescriber agrees, with serum potassium monitoring
Risk of severe hyperkalaemia. Avoid the combination: the triamterene and amiloride labels list potassium supplements as a contraindication except in severe hypokalaemia, and the spironolactone label advises avoiding them
Reduce renal blood flow and potassium excretion; can raise serum potassium, especially with kidney impairment or combined with ACE inhibitors/ARBs
Blocks the renal epithelial sodium channel like a potassium-sparing diuretic, reducing potassium excretion; can cause dangerous hyperkalemia, particularly with kidney impairment or other potassium-raising drugs
Hyperkalaemia. The label names potassium supplements and potassium salt substitutes as a risk factor, alongside kidney impairment and diabetes
Hyperkalaemia. The label advises against potassium supplements or potassium salt substitutes without the prescriber's agreement
Severe hyperkalaemia, which can cause dangerous heart rhythms
Hyperkalaemia. The label says potassium supplements and potassium salt substitutes should be used cautiously, if at all, and names them as a risk factor, alongside kidney impairment and diabetes
Hyperkalaemia. The label advises caution with potassium supplements and frequent serum potassium monitoring, it does not list them as a contraindication
Raised serum potassium, and in heart failure a rise in creatinine. The label names potassium supplements and potassium salt substitutes among the causes
Hyperkalaemia, which the US triamterene label’s boxed warning says can be fatal if uncorrected
Complex interaction - both deficiency and excess dangerous
Counteracts therapeutic effect of potassium removal
Tip: Take with food; use slow-release forms
Tip: Monitor if on medications that raise potassium; avoid with kidney disease
Potassium has an evidence score of 8.5/10 — very strong evidence based on 185 indexed studies, including 9 meta-analyses. Primary intracellular electrolyte that regulates blood pressure, nerve transmission, and muscle contraction — works in balance with sodium. Representative study: PMID 40612568.
Dosing for Potassium: Supplements commonly provide 99 mg per serving, and food provides more (no cited trial states the dose it used). No upper limit is established, so no maximum is stored. That is not a statement that larger amounts are safe. Individual needs vary, so check the right dose for you with a healthcare provider.
The best time to take Potassium is with meals. Take it with food. Potassium supplementation with meals reduces the GI irritation and nausea that concentrated potassium salts can cause.
Potassium has a safety rating of "moderate". That is a category, not a measure of individual risk, and there are precautions worth knowing. The most commonly reported side effects are GI upset, hyperkalemia. Use caution if any of these apply to you: Kidney disease; Hyperkalemia; Use of potassium-sparing diuretics.
Magnesium
Mixed evidenceSupports 300+ enzymatic reactions — critical for sleep, stress response, muscle function, and cognitive health.
Zinc
Likely helpsInvolved in 300+ enzymatic reactions — supports immune defense, testosterone production, wound healing, and sleep quality.
Creatine
Likely helpsIncreases phosphocreatine stores for faster ATP regeneration, boosting strength, power output, and cognitive function under stress.
Whey Protein
Likely helpsComplete protein with high leucine content that maximizes muscle protein synthesis.
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Reviewed by Dr. Baher Al Hakim · Last reviewed May 2026 · evidence from 186 studies · how we score · editorial policy
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.
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