<<Disclaimer: Verify this information before applying it to your situation.>> Hi Fran, Tapioca doesn't have much food value except calories according to my 13 ed of Pennington & Church _Food Values of Portions Commonly Used_ One Tablespoon of dry tapioca has 1 mc Calcium, 2 mg of Potassium and 1 mg of phosphorus & a trace of magnesium, iron and sodium. It still is a good source to make some our other flours more useful. Lynelle