The number of units in 400 mg depends on the substance being measured, as different substances have different unit conversions. For example, if you are referring to a medication, the unit could be in international units (IU) or another measure specific to that medication. Without knowing the specific substance, it's not possible to provide a precise answer. If you have a particular substance in mind, please specify for a more accurate conversion.
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400 mg = 0.4 g
Depends on what units you are talking about :)
0.4g
40000 units of what? without some known value to give an equivalence betweem 'units' and mg this cannot be answered.
400