1000 µg = 1 mg = 0.001 g

banana 500 g**
protein 6 g
protein quality 9 %
fat 1 g
linolenic acid 123 mg
carbs 100 g
vitamin E activity 1 mg
vitamin B1 220 µg
vitamin B2 280 µg
vitamin B3 3 mg
vitamin B5 1 mg
vitamin B6 2 mg
folic acid 80 µg
vitamin C 60 mg
calcium 43 mg
magnesium 180 mg
iron 3 mg
zinc 1 mg
potassium 2 g
iodide 14 µg
chloride 500 µg
vanadium 30 µg
silicon 40 mg

** Souci, Fachmann, Kraut;
Food Composition And Nutrition Tables
Medpharm Scientific Publishers Stuttgart