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IGF-1 LR3 reconstitution calculator

Medically reviewed by Juan Pablo Frías, MD · · DisclosureUpdated Educational use only
1Vial size
2Bacteriostatic water added
3Dose per injection
4Syringe (U-100)
Draw to
5units
= 0.05 mL on a 1 mL U-100 insulin syringe
1 mg vial1 mL water50 mcg dose
Concentration
1 mg/mL
Doses per vial
20
Weeks (1 dose/wk)
20
Math only. It does not recommend a dose. IGF-1 LR3: Not FDA approved · research chemical.

5 units (0.05 mL) on a 1 mL U-100 syringe: 50 mcg from a 1 mg vial + 1 mL water (IGF-1 LR3).

Dosing table for a 1 mg vial

Syringe units (U-100) for each dose, by how much bacteriostatic water you add.

IGF-1 LR3: U-100 syringe units per dose for a 1 mg vial
Dose0.5 mL water1 mL water2 mL water
10 mcg0.512
20 mcg124
50 mcg2.5510
100 mcg51020

How the math works

Concentration is the vial's milligrams divided by the water you add. Volume to draw is your dose divided by that concentration. On a U-100 syringe, 1 mL is 100 units, so units = mL × 100.

1 mg ÷ 1 mL = 1 mg/mL
50 mcg = 0.05 mg; 0.05 mg ÷ 1 mg/mL = 0.05 mL
0.05 mL × 100 = 5 units

How many units is 50 mcg of IGF-1 LR3?

With a 1 mg vial and 1 mL of bacteriostatic water, 50 mcg is 5 units (0.05 mL) on a U-100 syringe. With 0.5 mL of water it is 2.5 units. The answer always depends on how much water was added.

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

The water only sets the concentration; the amount of IGF-1 LR3 in the vial stays the same. 1 mL makes 1 mg/mL, so 50 mcg is 5 units. 2 mL makes 0.5 mg/mL, so the same 50 mcg is 10 units. More water makes small doses easier to measure but needs more volume per injection.

How many 50 mcg doses are in a 1 mg vial?

1 mg is 1,000 mcg; 1,000 ÷ 50 = 20, so 20 full doses of 50 mcg. Any liquid lost in the needle and vial is not counted.

Preset doses are round numbers for the arithmetic, not dosing guidance. Vial sizes are the ones most often mentioned for IGF-1 LR3 in community discussions.

5 units · 0.05 mL · 50 mcg from 1 mg + 1 mL

Sources

  1. 1Metric (SI) Prefixes (NIST Reference on Constants, Units, and Uncertainty)National Institute of Standards and Technology (NIST) · 2025physics.nist.govAccessed 2 Oct 2026
  2. 2BASAGLAR (insulin glargine) injection, prescribing information (DailyMed)U.S. Food and Drug Administration / DailyMed (Eli Lilly and Company label) · 2026dailymed.nlm.nih.govAccessed 2 Oct 2026

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