Potassium is an essential macromineral in human nutrition with a wide range of roles, including transmission of nerve impulses, contraction of cardiac and skeletal muscles, and production of energy. Potassium is the predominant electrolyte within cells and essential for maintaining proper cellular tonicity. The citrate salt of potassium has been shown to aid in the preservation of skeletal integrity. In this respect, it may function by partially neutralizing the high acid loads associated with typical Western diets to help prevent the excessive loss of calcium. Fruits and vegetables are the richest dietary sources of potassium; potassium-rich foods include leafy greens, fruits and root vegetables.