pure encapsulations potassium magnesium (citrate) | supports heart health, muscles, bone mineralization, nerves, and acid/alkaline balance* | 180 capsules pure encapsulations potassium and magnesium both support healthy nerve impulse function, muscle contraction, cardiovascular function, acid/alkaline balance, and carbohydrate and nutrient metabolism. magnesium also plays an important role in facilitating potassium utilization, helping to provide optimal support.