69mg.
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Yes, 0.5mg is a half of 1mg.
1000 mg = 1 gram, so half of a gram (0.5g) is = a half of 1000 mg = 500 mg
Half of 0.1 mg is 0.05 mg. To find this, you simply divide 0.1 by 2, resulting in 0.05 mg.
138 / 2 = 69
One mg is safer than the 5 mg (and even half of 5mg) that you use to take.