Assuming mg is milligrams (the standard abbreviation) the answer is none.
A milligram is a measure of mass. A gallon is a measure of volume. The two measure different things and,according to basic principles of dimensional analysis, conversion from one to the other is not valid.
If you are not convinced, consider a gallon of air. How many milligrams? Next consider a gallon of molten lead. How many milligrams?
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1n scoop; 5000 mg is 5g.
5000 mg = 5 grams1 milligram = 0.001 grams
1000 mcg = 1 mg so 5000 mcg = 5000/1000 = 5 mg. Simple!
5,000,000
5000mcg equals 5mg (1000mcg per mg).