1000 µg = 1 mg = 0.001 g

cucumber 300 g**
protein 5 g
fat 1 g
linolenic acid 126 mg
carbs 5 g
vitamin E activity 185 µg
total carotenes 1 mg
vitamin B1 54 µg
vitamin B2 90 µg
vitamin B3 600 µg
vitamin B5 720 µg
vitamin B6 100 µg
biotin 3 µg
folic acid 80 µg
vitamin C 24 mg
calcium 210 mg
magnesium 70 mg
iron 2 mg
zinc 1 mg
sodium 26 mg
potassium 423 mg
chloride 111 mg
manganese 450 µg
boron 11 µg
chromium 9 µg
nickel 11 µg
molybdenum 3 µg
fluoride 60 µg
iodide 6 µg

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