Essential Mineral Supports Electrolyte Balance and Normal pH Proper Muscular Contraction A Dietary Supplement Vegetarian/Vegan Minerals Family Owned Since 1968 Quality Assured - GMP 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.