It takes several days for potassium supplementation to take effect.

It usually takes 3-7 days for potassium supplementation to take effect, although the exact time may vary. If any symptoms of discomfort occur, it is recommended to seek medical attention at a hospital as soon as possible and follow the doctor's instructions for treatment.

If potassium is supplemented orally via potassium supplements or potassium-rich foods, effects may gradually appear within 3-5 days. This is because oral potassium supplementation is relatively mild, and the absorption and utilization of potassium ions require some time. For patients with chronic or mild potassium deficiency, continuous oral potassium supplementation helps gradually restore normal potassium levels and improve symptoms such as fatigue and muscle weakness.

If the patient's condition is severe—for example, if blood potassium levels are significantly below the normal range or there is ongoing potassium loss, such as in cases of severe diarrhea or vomiting—the treatment duration will be longer. Potassium supplementation may take 5-7 days or even longer to show effects. In such cases, patients may require more intensive potassium replacement therapy, including oral and/or intravenous potassium supplementation, along with strict medical monitoring as directed by a physician.

Maintaining healthy lifestyle habits, such as regular sleep patterns and balanced nutrition, can help promote potassium absorption and utilization, thereby accelerating the time it takes for potassium supplementation to take effect.