From the Manufacturer's Label:
Supports Energy Production**
Critical for Enzyme Function**
Magnesium Oxide is derived from ancient oceanic deposits and is a rich source of elemental magnesium (58% average). Magnesium is an essential mineral that plays a key role in the activation of amino acids for protein biosynthesis and is highly concentrated in intracellular fluid and bone.**
Manufactured by Now Foods.
Contains no yeast, milk, wheat, gluten, egg, corn or soy.