Magnesium helps convert carbohydrates, protein, and fats to energy, acts as a catalyst in thousands of enzymatic processes, regulates and maintains vascular tone, and is critical to proper bone formation. It regulates calcium and potassium metabolism, facilitates muscle constriction and relaxation, and assists in nerve transmission and conduction. This formulation uses magnesium citrate, a readily soluble form of magnesium. This form is better absorbed by individuals with hypochlorhydria compared to other less-soluble forms of magnesium.SUPPLEMENT FACTS: Magnesium (as magnesium citrate) - 150 mg (37%). Other Ingredients:Vegetarian capsule (hydroxypropyl methylcellulose, water) and L-leucine.