Source Naturals Manganese delivers a 10 mg serving of this essential trace mineral. Involved in many vital functions in the body, manganese plays a role in energy production, as well as normal bone formation and development. Source Naturals Manganese is specially bonded (chelated) with amino acids to protect mineral value and enhance absorption. Contains no egg, yeast, dairy, gluten, soy, wheat, sugar, salt, preservatives, or artificial color, flavor or fragrance.