Ultra-Mag™ is made with a balanced blend of sources shown to have high bioavailability and absorption. Magnesium is an essential mineral, necessary for producing and storing energy (ATP), allowing muscles to relax, activating over 300 key metabolic enzymes, supporting healthy mineral levels in bones and teeth, and regulating electrical activity in nerve cells.* Allergies: Contains no yeast, dairy, egg, gluten, soy or wheat. Contains no sugar, preservatives, or artificial color, flavor or fragrance.