Study Shows That 80% Of Americans Suffer With Magnesium Deficiency Study Shows That 80% Of Americans Suffer With Magnesium Deficiency November 24, 2017 Collis Cox Comments 0 Comment #7: Black Beans ½ cup: 60 milligrams (15% Daily Value) Pages: 1 2 3 4 5 6 7 8 9 10 11