Blood pressure reduction
Potassium counteracts the blood pressure-raising effects of sodium by promoting renal sodium excretion and relaxing blood vessel walls. Every 1 g/day increase in potassium intake is associated with ~1–2 mmHg reduction in systolic BP.
Cardiovascular health
Higher dietary potassium intakes are strongly associated with reduced risk of stroke, heart disease, and arrhythmia. Adequate potassium maintains cardiac muscle electrical potential and prevents dangerous rhythm disturbances.
Muscle function and cramp prevention
Potassium is essential for muscle membrane repolarization after contraction. Deficiency causes muscle weakness, cramps, and fatigue — particularly common in athletes with high sweat losses.
Kidney stone prevention
Potassium citrate alkalinizes urine and reduces calcium excretion, significantly reducing risk of calcium oxalate kidney stone formation. Clinically used as pharmaceutical treatment for recurrent nephrolithiasis.
Sodium-potassium ATPase pump
Na+/K+-ATPase pumps maintain the steep potassium gradient across cell membranes, which is the foundation of the resting membrane potential in all excitable cells (neurons, cardiac, skeletal muscle).
Renal natriuresis
High potassium intake stimulates aldosterone-independent renal sodium excretion, directly lowering blood volume and blood pressure. This mechanism explains potassium's antihypertensive effect.
Vascular smooth muscle relaxation
Potassium activates membrane hyperpolarization in vascular smooth muscle cells via K+ channel opening, causing vasodilation and reduced peripheral resistance.
Cochrane meta-analysis of 22 RCTs examining potassium supplementation effects on blood pressure.
1,606 participants across 22 RCTs.
Potassium supplementation reduced systolic BP by 3.5 mmHg and diastolic BP by 2.0 mmHg. Larger effects in hypertensive individuals and those with high sodium intake.