Potassium is the third most abundant mineral in the body . It helps the body regulate fluid, send nerve signals and regulate muscle contractions. Roughly 98% of the potassium in your body is found in your cells. Of this, 80% is found in your muscle cells, while the other 20% can be found in your bones, liver and red blood cells . Once inside your body, it functions as an electrolyte. When in water, an electrolyte dissolves into positive or negative ions that have the ability to conduct electricity. Potassium ions carry a positive charge. A potassium-rich diet may reduce blood pressure and water retention, protect against strokes and help prevent osteoporosis and kidney stones.