Minerals

Potassium (Citrate)

Evidence: strong_human

Mechanism of Action

Potassium is the principal intracellular cation, maintaining resting membrane potential (-70 to -90mV) via the Na+/K+-ATPase pump (3 Na+ out, 2 K+ in per ATP). It is essential for: cardiac rhythmicity (phase 3 repolarization of cardiac action potential), skeletal muscle contraction, nerve impulse transmission, acid-base balance (exchanged for H+ in renal tubules), blood pressure regulation (promotes natriuresis via renal sodium excretion), and insulin secretion. Citrate form provides alkalinizing anion that inhibits calcium oxalate and uric acid kidney stone formation.

Dosing Protocol

Standard: 99-200mg per capsule (regulatory limit in US); dietary target 3500-4700mg/day total

Maintenance: 99-200mg supplemental + dietary sources

Administration: oral

Timing: With meals, divided throughout the day. Slow-release forms preferred for higher doses.

Duration: ongoing

Notes

The 99mg/capsule US regulatory limit makes meaningful supplementation via capsules impractical. Recommend dietary strategies: avocado (975mg), potato (926mg), banana (422mg), coconut water (600mg/cup), or salt substitutes (potassium chloride, 1/4 tsp = ~650mg). Electrolyte powders can provide higher amounts. The Na:K ratio matters as much as absolute K intake — target 1:2 or higher (modern diets are inverted at 2:1 Na:K). Hyperkalemia is potentially fatal — cardiac monitoring required for any client on ACE/ARBs/K-sparing diuretics.

Stacking

  • Magnesium
  • Sodium (for electrolyte balance)
  • Vitamin D3

Interactions

  • ACE inhibitors/ARBs [HIGH] — These drugs reduce potassium excretion — combined supplementation risks hyperkalemia
  • Potassium-sparing diuretics (spironolactone, amiloride) [HIGH] — Directly increase potassium retention — supplementation contraindicated
  • NSAIDs [MEDIUM] — NSAIDs reduce renal potassium excretion
  • Digoxin [HIGH] — Hypokalemia potentiates digoxin toxicity; hyperkalemia reduces digoxin efficacy. Potassium levels must be monitored.

Contraindications

  • Hyperkalemia
  • Renal insufficiency (impaired K+ excretion)
  • Addison's disease (aldosterone deficiency)
  • Concurrent ACE inhibitor/ARB + potassium-sparing diuretic

Side Effects

  • GI irritation/ulceration (non-microencapsulated forms)
  • Nausea
  • Diarrhea
  • Hyperkalemia (dangerous — cardiac arrhythmias)

Key Papers

  • 10.1136/bmj.f1378
  • 10.1161/HYPERTENSIONAHA.117.09928
  • 10.1681/ASN.2010060617

Source Quality

Potassium citrate is preferred form — provides alkalinizing citrate for kidney stone prevention. Potassium chloride (KCl) for repletion with metabolic alkalosis. Potassium bicarbonate for acid-base issues. US supplements limited to 99mg/capsule by regulation. Bulk potassium citrate powder (Nu-Salt, Morton Lite Salt) provides higher amounts as food-grade salt substitute. Brands: NOW Potassium Citrate, Life Extension, Bulk Supplements powder.

Disclaimer: This information is for educational purposes only and is not medical advice. BioAccelera Labs does not diagnose, treat, or prescribe. Consult a licensed healthcare provider before using any compound.

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