Mass units
| Unit | Symbol | In grams | In mg |
|---|---|---|---|
| Gram | g | 1 | 1,000 |
| Milligram | mg | 0.001 | 1 |
| Microgram | mcg (µg) | 0.000001 | 0.001 |
Volume units
| Unit | Symbol | In liters | In mL |
|---|---|---|---|
| Liter | L | 1 | 1,000 |
| Milliliter | mL | 0.001 | 1 |
| Microliter | µL | 0.000001 | 0.001 |
Concentration units
- mg/mL: milligrams of substance per milliliter of liquid. Equal to g/L.
- mcg/mL: micrograms per milliliter. 1 mg/mL = 1,000 mcg/mL.
- IU/mL: international units of biological activity per milliliter.
IU: the special case
IU (international unit) measures biological activity relative to a reference standard. It is not mass. Any IU-to-mg relationship is specific to a substance and should be taken from the official labeling of the product in hand. This site does not assume a factor.
Label terminology
- Strength: the amount of active substance per vial or cartridge, as stated on the label.
- Lyophilized: freeze-dried powder.
- Diluent: the liquid added to dissolve a powder.
- Reconstituted concentration: the concentration the label states after mixing, where given.
For fuller explanations see Understanding HGH Vial Labels.