Potassium is well known to reduce blood pressure by inducing diuresis (increased production of urine). However, precisely how potassium achieves this effect is less well-known. Potassium works to lower blood pressure primarily in a specific part of the kidney, known as the distal convoluted tubule.[1] This area of the kidney acts as a potassium sensor. When potassium is low, the kidney holds onto more potassium and water and increases blood pressure. When potassium is high, it allows more potassium and more water to pass by, reducing blood pressure. Furthermore, high sodium intake can increase potassium excretion,[2] indicating that high sodium intakes can exacerbate potassium balance issues in those who consume low potassium diets.
How does potassium lower blood pressure?
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•Last Updated: May 16, 2025
Potassium lowers blood pressure by promoting diuresis, primarily in the kidney's distal convoluted tubule. High potassium levels increase potassium and water excretion, which reduces blood pressure, whereas low potassium levels cause retention, which raises blood pressure.