Krebs Magnesium Potassium Bioactive Mineral Complex provides an ideal ratio of magnesium and potassium, two of the most important minerals for the heart. These nutrients contribute to heart muscle contraction through their role in energy production. The minerals in Krebs Magnesium Potassium Bioactive Mineral Complex are chelated to the Krebs cycle intermediates (citrate, fumarate, malate, succinate, and aspartate), so they are easily ionized. This increases their bioavailability within the body. Vegetarian. Contains no sugar, salt, yeast, wheat, gluten, corn, soy, dairy products, artificial flavoring, preservatives or ingredients of animal origin.