Pick the vial, the water you added and the dose. Get the exact draw in units for the syringe in your hand.
Draw to8.0units0.08 mL
Step 1 of 4
1How many mg are in your vial?
Vial strengthamount printed on the vial
2How many mL of water did you add?
Bacteriostatic water addedhow much water you added
3What dose do you want to convert?
Target doseenter the dose you want to convert
This vial holds 1,000 mcg in total.
4Which syringe are you using?
Syringe typematch the label on your syringe
U-100 insulin syringe · 1 mL · lines every 2 units · 1 unit = 0.01 mL
Draw to
8.0units
0.08 mL · 0.50 mg/mL · 5 mcg per unit · 25 doses per vial
8.0 units on a U-100 insulin syringe · 1 mL · lines every 2 units, which is 0.08 milliliters. The draw lands on a syringe line.
Easy to read on this syringe. Draw to the 8-unit line. No rounding is needed.
1 mg ÷ 2 mL = 0.50 mg/mL → 5 mcg/unit · 40 mcg = 0.080 mL =8.0 units
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Show the math and syringe details+
Can this syringe show the result clearly?
Easy to read on this syringe.8.0 u is exactly the 8-unit line on a U-100 — no rounding error at all.
Want an easier syringe number?
This setup is already easy to read. Changing the water between 0.5 and 3 mL would not put 40 mcg closer to a line on this U-100 syringe.
Adding more water makes the mixture less concentrated, so the same dose uses more syringe units. It does not change how much peptide is in the vial.
This setup is in the address bar — every input is part of the link.
Educational math, not medical advice — dosing decisions belong to a licensed clinician. The tabs above also plan a schedule week by week and count how many doses one vial holds.
How to use the calculator
STEP 1
Enter the amount in the vial
Use the total amount printed on the vial, in mg.
STEP 2
Enter the water you added
Use the amount of water added to that vial, in mL.
STEP 3
Enter the dose you want to convert
Choose mg or mcg, then match the result to your syringe.
IGF-1 LR3 is a re-engineered insulin-like growth factor 1. The changes stop your carrier proteins holding it back, so it stays active far longer than the natural version. Bodybuilding forums use it to grow muscle, usually on the back of a growth-hormone course.
Its documented job is industrial. It is sold as a catalogue reagent for growing cells in tanks, where staying active is exactly the selling point. No study of it in people has ever been registered. The change that makes it useful in a tank is the change that removes your body’s own brake on the signal.
No completed controlled human trial has shown which dose works for IGF-1 LR3. The range people report using is not a study result, tested schedule or recommendation.
no human dose shown to work
The calculator converts the dose you enter into mL and syringe units. It does not show that any dose of IGF-1 LR3 is safe or works.
Examples using a 1 mg IGF-1 LR3 vial
Each row starts with the same 1 mg vial and changes only the amount of water. More water makes the mixture less concentrated, so the same dose uses more syringe units.
◆ How the water amount changes the resultdose used: 40 mcg
For a 1 milligram vial: bacteriostatic water added, resulting concentration, micrograms per U-100 unit, and the draw for a 40 mcg dose.
Water added
Concentration
Per U-100 unit
Draw for 40 mcg
Nearest syringe line
1 mL
1.00 mg/mL
10.0 mcg
4.0 u · 0.040 mL
exactly 4 u
2 mL
0.50 mg/mL
5.0 mcg
8.0 u · 0.080 mL
exactly 8 u
The vial, water and dose shown here are the calculator’s starting example for IGF-1 LR3. Replace them with your own values. Every result in the table is calculated from those inputs.
Drawn from once a week at 40 mcg, a 1 mg vial yields 25 doses — about 25.0 weeks of supply. No cited source says how long the mixed vial keeps, so no storage window is shown.
Two vial sizes, tenfold apart
The vials sold under this name differ by a factor of ten. Read the concentration off the wrong one and every number on this page is out by an order of magnitude. That is not a rounding slip.
3Open the mixing details — 3 notes
A tenfold gap is the whole risk here
Most compounds on this site vary by two or three times between vial sizes. This one varies by ten, and the vials look identical.
The smaller vial makes the weakest solution anything here produces, so the same dose reads many times further up the barrel on it. No combination of water volumes closes that gap, and nothing on the glass warns you which vial you have.
The weak solution is easy to read and quick to finish
Spread the smaller vial through the larger water volume and a modest dose sits most of the way up the barrel. That is a comfortable measurement.
It also means very few doses in the vial, because there was never much powder to begin with. Comfort on the barrel and length of supply pull against each other here more sharply than anywhere else.
It is catalogued as a laboratory reagent
The documented commercial use of this analogue is as an additive in cell-culture media, where the properties that make it unusual are the selling point.
No study in people has ever been registered. Not run and unreported — never registered at all. A certificate written for a bioreactor tells you the material suits a bioreactor, and this page’s arithmetic inherits none of it.
Here a mixing error is a blood-sugar event, not a wasted vial
On most pages a concentration mistake costs you powder. This analogue drives glucose down. The closest regulated relative it has warns about severe low blood sugar, and about the seizures that can follow. That is why the arithmetic here is worth doing twice.
5Read the supporting evidence — 5 supporting notes
The comparator that exists, and the one thing it is good for
A recombinant human insulin-like growth factor is an approved medicine. It is not this molecule. Its label is the nearest regulated document to it that anyone can read.
Two vial families, bought by two different people
The strengths on this page are not two sizes of one product. They serve two markets.
The published research is a mouse, a sheep heart cell and a rat gut
It is worth naming what the research on this molecule actually is, because the name sounds clinical. There is a mouse lactation study. There are fetal sheep heart cells. There is work on how much survives a rat’s intestine.
The water presets are narrow on purpose
Most records here list water volumes that spread widely. This one holds them to a close pair, and the barrel is what decided it.
A run, a break, and the point where the arithmetic stops
The circulating pattern is daily, after training, in runs of a few weeks with a matching pause after them. The supply arithmetic on this page assumes an unbroken rhythm instead.
Units to dose at 0.50 mg/mL
Mix 1 mg into 2 mL and one U-100 unit carries 5.0 mcg. The table shows how much peptide is in each numbered syringe line. These are conversion examples, not suggested doses.
10Open the unit conversion table — 10 rows
Numbered U-100 syringe lines converted to volume and mass at 0.50 milligrams per milliliter.
U-100 line
Volume
Mass (mcg)
Mass (mg)
10 u
0.10 mL
50 mcg
0.05 mg
20 u
0.20 mL
100 mcg
0.1 mg
30 u
0.30 mL
150 mcg
0.15 mg
40 u
0.40 mL
200 mcg
0.2 mg
50 u
0.50 mL
250 mcg
0.25 mg
60 u
0.60 mL
300 mcg
0.3 mg
70 u
0.70 mL
350 mcg
0.35 mg
80 u
0.80 mL
400 mcg
0.4 mg
90 u
0.90 mL
450 mcg
0.45 mg
100 u
1.00 mL
500 mcg
0.5 mg
How the math works
Concentration — divide the amount in the vial by the water you added: mg ÷ mL = mg/mL. This tells you how many mg are in each mL.
Volume — the dose divided by that concentration: dose ÷ (mg/mL) = mL.
Units — on a U-100 syringe one unit is 0.01 mL, so mL × 100 = units. A U-40 unit is 0.025 mL, so the wrong barrel is a 2.5× error. That is why the calculator asks which one you have.
Rounding gap — the exact draw against the nearest syringe line: |exact − nearest line| ÷ exact × 100 = % difference.
Medically reviewed by Jennifer Montecillo, MD · non-practicing medical reviewer·Reviewed 2026-08-12·open the primary sources
Useful guides for this calculation
The math is only one part of the question. These guides cover the compound, published doses, side effects, mixing steps and supplies.
1 mL or 2 mL, and both make an unusually weak solution: 1 mg/mL and 0.5 mg/mL. Against the 40 micrograms that circulates for this analogue, those draw 4 and 8 units.
Four units is hard to read because one mark is a quarter of the draw. The 2 mL choice lands on a syringe line. Another vial sold under this name holds 0.1 mg, ten times as much powder.
How long does a 1mg vial of IGF-1 LR3 last?
Twenty-five draws at 40 micrograms, since 1 mg is 1000 micrograms and the water cannot change that. The 0.1 mg vial holds two.
The pattern printed in the review that records this practice is once a day, in runs of four to six weeks. Twenty-five daily draws does not reach the end of the shortest run. That is arithmetic about a protocol nobody has tested.
What is the dosing for IGF-1 LR3?
There is none. No study of this analogue in a person has ever been registered — not run and unreported, but never registered at all. The published research is mouse lactation, fetal sheep heart cells, rat gut absorption and a mouse brain.
A 2026 review does tabulate what people give themselves: 20 to 40 micrograms once a day. It footnotes that very row — no peer-reviewed clinical study reports a dosing regimen for this analogue in humans. Its documented commercial use is as an additive in cell-culture media.
How much muscle can you gain on IGF-1 LR3?
Nobody has measured it. No trial of this analogue in people exists, so there is no body-composition figure, no strength figure and nothing to report.
Published research is limited to animal and manufacturing work, and none of it measured muscle gain. The molecule was designed to avoid the proteins that normally carry IGF-1 in the body. The label for the closest approved medicine warns about severe low blood sugar.
1primary source, each with the day we read it — open the documents used on this page