Potassium is one of seven macro minerals--inorganic nutrients needed in relatively high daily amounts. Along with chloride, sodium, magnesium and calcium, potassium is an essential electrolyte. They are called electrolytes because they carry an electrical charge when dissolved in body fluids. These three elements are distributed throughout the body's fluids, including blood, lymph, and inter-cellular fluids. Electrolytes help regulate nerve transmission and many cell membrane functions. Magnesi