Potassium is not a nutrient that is mandated to be listed on a food label. So entries that were entered by members (using the food label) will not contain this info. You are probably getting more potassium than your report shows. Are there foods that you know contain potssium but are showing a zero on your report?
To get an extensive listing of potassium in foods, click here: ndb.nal.usda.gov/
On the left column, select NUTRIENT LISTS.
Select potassium by amount.
Hope this helps.