Potassium Gluconate 550 Mg Tablets, By Nature Made Helps Control Activity Of The Heart Muscle. Potassium gluconate helps regulate water balance within the body. It works to control the activity of the heart muscle, nervous system and kidneys. No Artificial Colors. No Artificial Flavors. No Preservatives. No Chemical Solvents, Yeast, Starch or Gluten. Potassium Gluconate tablets made to USP and Nature Made's guaranteed purity and potency standards. Active Ingredients: Potassium (from 550mg Potassium Gluconate) 90 mg 3%. Inactive Ingredients: Potassium Gluconate, Cellulose Gel, Stearic Acid, Magnesium Stearate, Silicon Dioxide, Croscarmellose Sodium.