Human Growth Hormone doses are measured in IU (International Units) for ease of measurement, as the actual milligram measurements and concentrations can become quite confusing and impractical. For example, 1mg of Human Growth Hormone is the equivalent of 3IU. This means that a single vial full of 10IU of Human Growth Hormone contains 3.3333333333mg of Human Growth Hormone in it. Measuring Human Growth Hormone in milligrams is therefore unreliable and impractical. Therefore, measurements of GH dosages are always in IU measurement units. More on this topic of proper Human Growth Hormone reconstitution, storage, and shelf-lives will be covered shortly in the proper administration section of this per of the profile.