GNC Potassium Gluconate 99 MG is a dietary supplement that helps maintain an optimal level of potassium in the body. It regulates the activity of the cardiovascular and nervous systems and osmotic pressure, being one of the most important intracellular ions. An optimal level of potassium also maintains the optimum concentration and physiological functions of magnesium. This supplement helps regulate water balance in the body, is necessary for normal contraction of muscle cells, and may prevent the deposit and accumulation of sodium ions in the blood vessels. The product comes in the form of vegetable tablets.