Check you entries---some may be inaccurate.
Sometimes a member will include a food but not include all the micronutrients, such as these.
Since potassium and magnesium are not required to be listed on a food label, the food may contain the nutrient yet it will not be listed in your report.
Never take individual nutrients, unless prescribed by your doctor. You could take a multivitamin-mineral supplement, like a One-A-Day, Centrum, or similar store brand.
And...if you want a listing of foods that contain the nutrient, click here. Select the nutrient by "amount" and you will get an extensive listing: www.ars.usda.gov/Services/docs.htm?docid=2
Hope this helps
SP Dietitian Becky