Potassium is a key nutrient in maintaining your body's electrolyte balance, regulating heart and muscle contraction, neutralizing acids and restoring alkaline salts to the blood stream. It is critical in cardiovascular and nerve function, regulating the transfer of nutrients and providing muscular energy. It regulates water balance, assists recuperation and aids rheumatic or arthritic conditions. It is needed for growth, building muscles, transmission of nerve impulses and heart activity, and is helpful in preventing kidney stones.