swanson potassium citrate - mineral supplement promoting heart health & energy support - aids optimal nerve & kidney function with natural ingredients - (120 capsules, 99mg each) swanson swanson ultra potassium citrate delivers pure, optimum-potency 99 mg potassium citrate capsules at a great value. potassium citrate benefits the human body in several ways, but is most widely taken because it supports cardiovascular health and energy production.