How many units is 2 IU of HGH (somatropin)?

It depends entirely on how much water you added. In a 10 IU vial reconstituted with 1 mL, the concentration is 10 IU/mL, so 2 IU is 0.2 mL, which is 20 units on a U-100 insulin syringe. In the same vial with 0.5 mL of water it is 10 units, and with 1.5 mL it is 30 units.

How much bacteriostatic water for a 10 IU HGH (somatropin) vial?

1 mL is the usual choice. It gives 10 IU/mL, which puts the commonly reported range of 0.5 IU to 6 IU between roughly 5 and 60 units. Aim for a draw between about 10 and 50 units, where the barrel is easiest to read, and add or remove water to get there.

How many doses are in a 10 IU vial?

Divide 10 by your dose. At 2 IU that is 5 doses, which at once daily is 5 days.

How many units is 2 IU of HGH?

It depends on the water. A 10 IU vial with 1 mL of water is 10 IU/mL, so 2 IU is 0.2 mL, which is 20 units on a U-100 insulin syringe. With 2 mL of water the same 2 IU is 40 units.

How many mg is 10 IU of HGH?

About 3.3 mg. The conversion for somatropin is roughly 3 IU per mg. You do not need it for the calculator, which works in IU throughout.

HGH (somatropin) dosage calculator

Growth hormone is the one compound here labelled in IU rather than mg. Put in the IU on your vial, the water you added and your IU dose, and get the mark on the syringe.

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The maths is openThe formula is written out on this page and the code behind it is a single file with an automated test suite.

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ReviewedDose ranges and half-life figures last checked 3 September 2026.

Dose to units, at the standard setup

Dose	Draw	U-100 units	Doses per vial	Vial lasts
1 IU	0.1 mL	10 units	10	10 days
2 IU	0.2 mL	20 units	5	5 days
3 IU	0.3 mL	30 units	3	3 days
4 IU	0.4 mL	40 units	2	2 days
5 IU	0.5 mL	50 units	2	2 days
6 IU	0.6 mL	60 units	1	1 day

Based on a 10 IU vial reconstituted with 1 mL of bacteriostatic water, which is 10 IU/mL, drawn on a standard U-100 insulin syringe, once daily.

About the numbers above

Somatropin is recombinant human growth hormone, a 191 amino acid protein. It is a prescription medicine with licensed uses, and any use outside a prescription is unlicensed. Vials sold as research material are not the licensed product.

The unit confusion here is specific: the vial is labelled in international units (IU), not milligrams, and the syringe is labelled in insulin units. They are unrelated. 1 mg of somatropin is roughly 3 IU. A 10 IU vial reconstituted with 1 mL gives 10 IU per mL, so 2 IU is 0.2 mL, which is 20 units on a U-100 insulin syringe. That 20 has nothing to do with the IU figure; it is a volume.

Growth hormone is fragile once reconstituted. Swirl, never shake, and keep it refrigerated. Reported protocols commonly run 1 to 4 IU per day, often split, but that is a description of what people report and not a recommendation.

A 10 IU vial at different water volumes

If the draw feels awkward to read, change the water rather than the dose. The dose stays the same; only the mark moves.

Vial	BAC water	Concentration	Draw	U-100 units	Doses/vial
10 IU	1 mL	10 IU/mL	0.2 mL	20 units	5
10 IU	2 mL	5 IU/mL	0.4 mL	40 units	5
10 IU	3 mL	3.33 IU/mL	0.6 mL	60 units	5
12 IU	1 mL	12 IU/mL	0.167 mL	16.7 units	6
12 IU	2 mL	6 IU/mL	0.333 mL	33.3 units	6
12 IU	3 mL	4 IU/mL	0.5 mL	50 units	6

All rows above assume a 2 IU dose and a standard U-100 insulin syringe, where 100 units = 1 mL.

How long it stays in you

The half-life of HGH (somatropin) is about 3.8 hours. That is the time for the amount in your blood to halve, so after one half-life you are at 50 percent of the peak, after two you are at 25 percent, and after four you are at roughly 6 percent. This is why it is dosed daily or more often: by the next morning almost none of the previous dose is left, and there is no build-up from day to day.

Common questions

How many units is 2 IU of HGH (somatropin)?: It depends entirely on how much water you added. In a 10 IU vial reconstituted with 1 mL, the concentration is 10 IU/mL, so 2 IU is 0.2 mL, which is 20 units on a U-100 insulin syringe. In the same vial with 0.5 mL of water it is 10 units, and with 1.5 mL it is 30 units.
How much bacteriostatic water for a 10 IU HGH (somatropin) vial?: 1 mL is the usual choice. It gives 10 IU/mL, which puts the commonly reported range of 0.5 IU to 6 IU between roughly 5 and 60 units. Aim for a draw between about 10 and 50 units, where the barrel is easiest to read, and add or remove water to get there.
How many doses are in a 10 IU vial?: Divide 10 by your dose. At 2 IU that is 5 doses, which at once daily is 5 days.
How many units is 2 IU of HGH?: It depends on the water. A 10 IU vial with 1 mL of water is 10 IU/mL, so 2 IU is 0.2 mL, which is 20 units on a U-100 insulin syringe. With 2 mL of water the same 2 IU is 40 units.
How many mg is 10 IU of HGH?: About 3.3 mg. The conversion for somatropin is roughly 3 IU per mg. You do not need it for the calculator, which works in IU throughout.

Buying HGH (somatropin)? The where to buy page lists the vendors this site uses and what to check before ordering, and Peptide Bureau keeps the ranked vendor scorecard.

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Read this before you use the numbers. This is a unit-conversion tool. It converts a vial strength and a volume of bacteriostatic water into a concentration, a draw volume and a mark on an insulin syringe. It does not tell you what to take, whether to take it, or whether a compound is safe for you. Most of the compounds listed here are sold for laboratory research use and are not approved for human use. Nothing on this site is medical advice. Dosing decisions belong with a licensed clinician who knows your history. Always confirm the strength printed on your own vial rather than trusting a preset.