Natural Dietary Supplement. 250 mg per tablet. Bone health. Questions? 1-888-423-0139. Quality Guaranteed. Gluten free. Magnesium is an essential mineral and plays an important role in energy metabolism, protein synthesis, neuromuscular transmission and bone structure. (This statement has not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease).