This is not a proper conversion. Cubic centimeters (cc) is a measure of volume. Grams (g), kilograms (kg) and milligrams (mg) are measures of weight or mass.
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1 milligram = 0.001 gram400,000 milligrams = 400 grams
1000 micrograms = 1 milligram so 400 mcg = 400/1000 milligrams = 0.4 milligrams. Simple!
400 cc of what?. Density is missing of the material.
400
CC is the roman numeral for 1,000, typically its measured in milligrams (millionth of a gram) so it'd be 5,000mg