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Nervous System and Cardiovascular Health99 mg Per CapsuleMineral SupplementSupports Cardiovascular HealthAssists in Energy ProductionSupports Nervous System FunctionScience-Backed Quality Since 1969Feed your heart and muscles every day with Swanson Potassium! Essential for proper energy utilization potassium is a vital electrolyte mineral needed by all of the muscles in the body including the most important muscle of all the heart. Our convenient capsules have 99 mg of elemental potassium.