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

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.

IndependentThis site does not sell peptides and is not owned by a vendor. Every other calculator on page one of Google belongs to a shop.

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.

How it earnsAffiliate links on one clearly marked page, and nowhere else. Never inside the calculator.

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
10 mcg	0.02 mL	2 units	100	100 days
20 mcg	0.04 mL	4 units	50	50 days
30 mcg	0.06 mL	6 units	33	33 days
40 mcg	0.08 mL	8 units	25	25 days
50 mcg	0.1 mL	10 units	20	20 days
100 mcg	0.2 mL	20 units	10	10 days

Based on a 1 mg vial reconstituted with 2 mL of bacteriostatic water, which is 0.5 mg/mL, drawn on a standard U-100 insulin syringe, once daily.

About the numbers above

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.

A 1 mg 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
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 stays in you

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.

Buying IGF-1 LR3? 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.

Every calculator and chart on this site

Weight management (GLP-1 family)

Retatrutide calculator Vial, water and weekly dose to syringe units
Tirzepatide calculator The 2.5 to 15 mg ladder, converted
Semaglutide calculator The 0.25 to 2.4 mg ladder, converted
Cagrilintide calculator Amylin analogue, 0.3 to 4.5 mg weekly

Growth hormone axis

HGH (somatropin) calculator IU vials to syringe units
Ipamorelin calculator mcg doses, in mL and units
CJC-1295 (no DAC) calculator No-DAC and DAC, mcg to units
CJC-1295 / Ipamorelin blend calculator The 5 mg + 5 mg blend, per component
Sermorelin calculator Nightly mcg doses to units
Tesamorelin calculator 1 to 2 mg daily, in units
Hexarelin calculator mcg doses to units
IGF-1 LR3 calculator (this page)
AOD-9604 calculator 300 mcg daily, in units
MOTS-c calculator 5 to 10 mg, two or three times a week

Repair, skin and blends

BPC-157 calculator mcg doses from a 5 or 10 mg vial
TB-500 calculator Loading and maintenance, in units
BPC-157 / TB-500 blend calculator The Wolverine stack, per component
GHK-Cu calculator Large vials, mg doses
GLOW blend calculator The 70 mg blend, split per component
KLOW blend calculator The 80 mg blend, split per component

Other compounds

PT-141 calculator 0.5 to 2 mg, as needed
Melanotan II calculator mcg loading doses to units
NAD+ calculator Large vials, 25 to 200 mg doses
Thymosin alpha-1 calculator 1.6 mg twice weekly, in units
Epitalon calculator Short courses of 5 to 10 mg
Kisspeptin-10 calculator mcg doses to units
Glutathione calculator Large mg doses, 200 mg/mL solutions

Dosage charts and schedules

Peptide reconstitution chart Concentration for every vial and water combination
Peptide dosing chart Printable unit tables for every compound
Retatrutide titration schedule 2 to 12 mg in units, stage by stage
Tirzepatide titration schedule 2.5 to 15 mg in units, stage by stage
Semaglutide titration schedule 0.25 to 2.4 mg in units, stage by stage
KLOW dosage and frequency chart The 80 mg blend at 2, 3 and 4 mL, both phases
GLOW dosage chart The 70 mg blend, units to each peptide
Wolverine stack dosing chart BPC-157 + TB-500, blend and separate vials
MOTS-c dosage chart 5 and 10 mg vials at three water volumes
Tirzepatide reconstitution chart Every vial size, every water volume, the whole ladder
Retatrutide dosing chart 1 to 12 mg across 10, 20 and 30 mg vials

Tools

Peptide calculator The general tool, any compound
Reconstitution calculator How much water to add, and why it matters
mg to units calculator Both directions, any concentration
Bacteriostatic water calculator Pick a volume that lands where you can read it
How to read an insulin syringe U-100 vs U-40, and the 2.5x error
The Protocol Pack Free 25-page printable reference
Where to buy Vendor notes and what to check first
1 mg to units on an insulin syringe The conversion table for every common concentration

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.