Understanding HGH Vial Labels
How to read the measurement information on a somatropin label: strength, units, diluent and stated concentration.
Last updated November 11, 2026
Label terms worth knowing
| Term | What it tells you |
|---|---|
| Strength | Amount of active substance per vial or cartridge, usually in mg and sometimes in IU |
| Dosage form | For example, lyophilized powder for injection |
| Diluent | The liquid supplied or specified for dissolving a powder |
| Concentration after mixing | Given on some labels, for example in mg/mL |
| Storage | Temperature and in-use limits, which are product-specific |
Strength and units
Labels state strength in the unit the manufacturer uses. Some use mg, some state IU as well. If both appear, the relationship between them is the one the label gives for that product. Do not apply a figure from a different product or website.
Stated concentration after mixing
Some labels give the concentration that results after the specified liquid is added. For instance, one official label lists a different concentration in mg/mL for each cartridge size. When a label states one, it is the best reference for your product, and it takes priority over a calculator.
A reading routine
- Find the strength and its unit.
- Note whether the label states a mixing liquid and volume.
- Look for any stated concentration after mixing.
- Check that the units you enter into a calculator match the label’s units.
- If anything is unclear, ask a pharmacist.
What this guide does not do
It does not tell you how to prepare or use a product, and it does not recommend amounts. See Understanding International Units for why IU needs care.