Potassium is an essential mineral that is widely distributed among food sources, with especially high levels present in fruits and vegetables. Potassium is critical for the maintenance of normal whole-body and cellular fluid levels, as well as for the maintenance of acid-base balance. It is also necessary for proper muscle contraction, the maintenance of healthy heart function, and for the transmission of nerve impulses. Potassium citrate is a well absorbed and highly bioavailable form of potassium.