Nat-rul Health Magnesium 250 Mg Caplets - 100 Ea ; UPC: 094604213706. Magnesium is an essential mineral that plays an important role in energy metabolism, protein synthesis, neuromuscular transmission and bone structure. Magnesium is important for bones and for cardiac system. This statement has not been evaluated by the FDA. See label image for supplement facts No Yeast No Corn No Soy No Rye No Barley No Milk No Sugar No Starch No Preservatives No Artificial Colors or Flavors Store in a dry place at room temperature. Keep out of reach of children.