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HCG and HGH are labelled in international units, not milligrams, and the word "unit" then means two different things on the same desk. This guide separates them, gives the IU conversion in three steps, and works it through for HCG at the concentration the Dosify Me app uses and for HGH at common vial labels.
Informational use only — not medical advice. Check every figure against your own product and talk to a licensed healthcare provider before starting or changing anything.
| Word | What it measures | Example |
|---|---|---|
| International unit (IU) | Biological activity, defined separately for each substance | 5,000 IU of HCG and 5,000 IU of HGH are not comparable amounts |
| Insulin-syringe unit | Volume: one unit is 0.01 mL | A U-100 syringe holds 100 units, which is 1 mL |
| Milligram and microgram | Weight | Most peptides are labelled this way: a 5 mg vial, a 250 mcg dose |
A peptide calculator built for mg and mcg still works for an IU vial, because the arithmetic is the same and only the label on the numbers changes. What you must never do is type IU into a field that expects mcg, or read a syringe unit as an IU.
Step 1 — IU per mL. IU in the vial ÷ water in mL. A 5000 IU vial with 2.00 mL of bacteriostatic water is 2500 IU/mL.
Step 2 — IU per syringe unit. IU per mL ÷ 100, because one unit is a hundredth of a millilitre. 2500 IU/mL is 25 IU per unit.
Step 3 — units to draw. Dose in IU ÷ IU per unit. 500 IU ÷ 25 = 20 units on an insulin syringe.
The Dosify Me calculator does exactly this for a compound dosed in IU. Its IU per mL, IU per unit and units figures are the same arithmetic as mg per mL, mcg per unit and units for a powder labelled in milligrams.
| Vial | Water | IU per mL | IU per unit | 500 IU reads | 1000 IU reads |
|---|---|---|---|---|---|
| 5000 IU | 2.00 mL | 2500 IU/mL | 25 IU | 20 units | 40 units |
| 10000 IU* | 2.00 mL | 5000 IU/mL | 50 IU | 10 units | 20 units |
* This size is conventionally mixed more concentrated rather than diluted further — fewer units per dose than smaller vials of this peptide.
The HCG page lists the same figures beside the schedule. The HCG calculator recalculates them for any amount of water you type.
Dosify Me does not list HGH, but the three steps are the same. Somatropin vials are labelled in IU, in mg, or both; the reference standard is 3 IU per mg, so a vial labelled 4 mg is 12 IU and a 10 IU vial is about 3.33 mg. Use the IU figure printed on your own label rather than converting it yourself.
| Vial label | Water | IU per mL | IU per unit | 1 IU reads | 2 IU reads |
|---|---|---|---|---|---|
| 10 IU | 1 mL | 10 IU/mL | 0.1 IU | 10.0 units | 20.0 units |
| 10 IU | 2 mL | 5 IU/mL | 0.05 IU | 20.0 units | 40.0 units |
| 12 IU (4 mg) | 1 mL | 12 IU/mL | 0.12 IU | 8.3 units | 16.7 units |
| 15 IU | 1.5 mL | 10 IU/mL | 0.1 IU | 10.0 units | 20.0 units |
The IU amounts in the last two columns are arithmetic examples of what the syringe shows, not a dose; the amount you draw is a question for a licensed healthcare provider. Notice that the same 12 IU vial lands on a third of a unit per IU when mixed with 1 mL, so a different amount of water puts whole IU on whole units.
At 2500 IU/mL, the mix the Dosify Me app uses for a 5000 IU vial (2.00 mL of water), each insulin-syringe unit holds 25 IU, so 500 IU is 20 units and 1000 IU is 40 units. A vial mixed with a different amount of water reads differently.
No. An IU measures biological activity and is defined separately for each substance; a syringe unit is a volume, 0.01 mL. The bridge between them is the IU per mL you created when you added the water.
Enter the vial in IU instead of mg and the dose in IU instead of mcg; the water stays in mL. The calculator then reports IU per mL and the syringe units for the dose. The arithmetic is identical to the mg version, only the labels change.
For somatropin the reference standard is 3 IU per mg, so 1 mg is 3 IU and a 4 mg vial is 12 IU. That factor belongs to somatropin alone; it does not apply to HCG or to any other IU-labelled product, and the IU figure printed on your own label always wins.
It depends on the water. A 10 IU vial with 1 mL is 10 IU/mL, so 2 IU is 20 units; with 2 mL it is 5 IU/mL and 2 IU is 40 units.
Dosify Me does this math for you. Pick the compound, your vial size and dose, and the app draws the exact syringe reading, keeps your schedule and reminders, and logs every dose — privately, on your phone.
Figures computed from the Dosify Me compound database on 2026-10-08.
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