Almost all of the body's potassium is inside the body's cells. Potassium, along with the other electrolytes such as sodium and chloride, maintains normal balance and distribution of fluids in all parts of the body.
Potassium is important in the body's acid-base balance, nerve transmission, and muscle function.
Potassium is important for maintaining normal blood pressure. The average daily diet provides 800mg. A deficiency of potassium is unlikely, except in cases of dehydration, excessive vomiting or diarrhea, kidney failure, or long-term use of diuretics or laxatives. Fasting, anorexia, or starvation are other possible causes of potassium deficiency. Excessive dietary or supplemental intake of potassium can be harmful.