Potassium – Uses, Benefits, Sources and Dosage We should not underestimate the importance of potassium in our diet plan. It is an important component which is essential for a healthy body. Potassium is an essential body mineral which is important for both cellular and electrical function. Potassium plays an important role in synthesis of proteins and muscle tissues. It also works inside our cells to maintain the pH. Blood serum contains approximately 4-5 mg of total potassium where as red