1000 µg = 1 mg = 0.001 g

walnuts 35 g**
protein 5 g
protein quality 29 %
fat 22 g
linolenic acid 2.4 g
carbs 4 g
vitamin E activity 2 mg
vitamin B1 120 µg
vitamin B2 42 µg
vitamin B3 350 µg
vitamin B5 285 µg
vitamin B6 300 µg
folic acid 27 µg
vitamin K 1 µg
calcium 30 mg
magnesium 45 mg
phosphorus 143 mg
potassium 190 mg
iron 875 µg
zinc 940 µg
manganese 690 µg
copper 305 µg
nickel 46 µg
fluoride 235 µg
iodide 1 µg
cobalt 3 µg
selenium 2 µg

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