Potassium is an essential mineral that is needed by all tissues in the body. It is classified as an electrolyte because it carries a small electrical charge that activates various cell and nerve functions. Potassium helps regulate fluid balance inside and outside of cells, supports normal blood pressure, and helps muscles to contract. Potassium also plays a role in bone health, as potassium-rich foods might offer a buffering “alkalinizing” effect that helps to neutralize acids in the body and may protect bone. Observational studies have found that a high potassium intake from fruits and vegetables is associated with higher bone density. Potassium is also important for heart function and plays a key role in skeletal and smooth muscle contraction, making it important for normal digestive and muscular function. A potassium-rich diet is linked to many powerful health benefits, including reducing blood pressure and water retention, protecting against stroke, and helping prevent osteoporosis and kidney stones. The kidneys work to maintain normal blood levels of potassium by flushing out excess amounts through urine. Most people get enough potassium for their daily requirements through their diet, and both high and low levels of potassium in the body can be dangerous.