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ng is nanograms (10-9 grams) mg is milligrams (10-3 grams) (1.2 x 10-9 grams) x (1000 mg / gram) = 1.2 x 10-6 mg = 0.0000012 mg
1.000 gm = 1,000 mg 0.900 gm = 900 mg
1/8th of a mg. You lose half every three hours.
9
.9 grams