How many units is 20 mcg of IGF-1 LR3?

It depends entirely on how much water you added. In a 1 mg vial reconstituted with 2 mL, the concentration is 0.5 mg/mL, so 20 mcg is 0.04 mL, which is 4 units on a U-100 insulin syringe. In the same vial with 1 mL of water it is 2 units, and with 3 mL it is 6 units.

How much bacteriostatic water for a 1 mg IGF-1 LR3 vial?

2 mL is the usual choice. It gives 0.5 mg/mL, which puts the commonly reported range of 10 mcg to 100 mcg between roughly 2 and 20 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 1 mg vial?

Divide 1 by your dose. At 20 mcg that is 50 doses, which at once daily is 50 days.

How many units is 20 mcg of IGF-1 LR3?

In a 1 mg vial with 2 mL of water, 4 units on a U-100 syringe. In a 100 mcg vial with 1 mL of water, 20 units.

IGF-1 LR3 dosage calculator

In a 1 mg vial with 2 mL of water (0.5 mg/mL), 20 mcg of IGF-1 LR3 is 4 units on a U-100 insulin syringe. IGF-1 LR3 comes in very small vials and is dosed in tens of micrograms. The arithmetic is the same, but the numbers are small enough that the water volume decides whether you can read the draw at all.

Reviewed 3 September 2026
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Dose to units at the usual vial and water

Dose	U-100 units	Draw	Doses per vial	Vial lasts
10 mcg	2 units	0.02 mL	100	100 days
20 mcg	4 units	0.04 mL	50	50 days
30 mcg	6 units	0.06 mL	33	33 days
40 mcg	8 units	0.08 mL	25	25 days
50 mcg	10 units	0.1 mL	20	20 days
100 mcg	20 units	0.2 mL	10	10 days

1 mg vial in 2 mL of bacteriostatic water (0.5 mg/mL), U-100 insulin syringe, once daily.

About IGF-1 LR3

IGF-1 LR3 is a modified insulin-like growth factor 1 with an extended half-life. It is not an approved medicine and is sold for research use. It lowers blood sugar, and reports of hypoglycaemia at higher doses are common, which is one reason people who use it keep doses low.

A 1 mg vial holds 1,000 mcg. Reconstituted with 2 mL that is 500 mcg/mL, so 20 mcg is 0.04 mL, or 4 units. Some vials are only 100 mcg, in which case the whole vial is a few doses and 1 mL of water gives 100 mcg/mL. Check the label; a ten-fold error here is easy to make.

The same 1 mg vial at other water volumes

If the draw is awkward to read, change the water, not the dose. The dose stays the same; only the mark moves.

Vial	BAC water	Concentration	Draw	U-100 units	Doses/vial
1 mg	1 mL	1 mg/mL	0.02 mL	2 units	50
1 mg	2 mL	0.5 mg/mL	0.04 mL	4 units	50
1 mg	3 mL	0.33 mg/mL	0.06 mL	6 units	50
0.1 mg	1 mL	0.1 mg/mL	0.2 mL	20 units	5
0.1 mg	2 mL	0.05 mg/mL	0.4 mL	40 units	5
0.1 mg	3 mL	0.03 mg/mL	0.6 mL	60 units	5

All rows above assume a 20 mcg dose and a standard U-100 insulin syringe, where 100 units = 1 mL.

How long it lasts in the body

The half-life of IGF-1 LR3 is about 20 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 20 mcg of IGF-1 LR3?: It depends entirely on how much water you added. In a 1 mg vial reconstituted with 2 mL, the concentration is 0.5 mg/mL, so 20 mcg is 0.04 mL, which is 4 units on a U-100 insulin syringe. In the same vial with 1 mL of water it is 2 units, and with 3 mL it is 6 units.
How much bacteriostatic water for a 1 mg IGF-1 LR3 vial?: 2 mL is the usual choice. It gives 0.5 mg/mL, which puts the commonly reported range of 10 mcg to 100 mcg between roughly 2 and 20 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 1 mg vial?: Divide 1 by your dose. At 20 mcg that is 50 doses, which at once daily is 50 days.
How many units is 20 mcg of IGF-1 LR3?: In a 1 mg vial with 2 mL of water, 4 units on a U-100 syringe. In a 100 mcg vial with 1 mL of water, 20 units.

IndependentThis site does not sell peptides and is not owned by a vendor.

The maths is openThe formula is on every page and in the methodology. The code is one file with an automated test suite, run before each deploy.

How it is fundedNo ads and no vendor links here. It is published by the team behind Peptide Bureau, which earns from affiliate links on its own site, and VialHaus, the same team's vial storage shop, which the storage notes link to.

ReviewedDose ranges and half-lives checked 3 September 2026.

Buying IGF-1 LR3?

Peptulator does not list, rank or link vendors. Whoever the supplier is, use the strength printed on your own vial and check the batch certificate of analysis before you rely on any number here.

The IGF-1 LR3 guideDosing, evidence and side effects, at Peptide Bureau Read a syringeU-100 vs U-40, and the 2.5x error Build a full protocolThe stack builder at Peptide Bureau, about two minutes

Common conversions

The same three-step maths, pre-filled for the doses people ask about most. Units on a U-100 insulin syringe, where 100 units is 1 mL.

mg to units calculator Any dose at any concentration, both directions, with the full reference tables
Units to mg calculator What the units you drew are in milligrams
1 mg to units The most-asked conversion, at every common setup

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