1000 µg = 1 mg = 0.001 g

oranges 500 g**
protein 5 g
protein quality 10 %
fat 1 g
carbs 41 g
vitamin E activity 2 mg
total carotenes 430 mg
vitamin B1 390 µg
vitamin B2 210 µg
vitamin B3 2 mg
vitamin B5 1 mg
vitamin B6 520 µg
biotin 11 µg
folic acid 210 µg
vitamin C 250 mg
vitamin K 18 µg
calcium 210 mg
magnesium 70 mg
iron 2 mg
zinc 530 µg
potassium 1 g
silicon 70 mg

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