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Recombinant IGF-1 analogue (cell-culture reagent) · dosing
IGF-1 LR3 dosage: the reported range, and what it rests on
People report taking IGF-1 LR3 at 20–40 mcg once a day, ideally after training. That range is what circulates, not what a study found. No completed controlled human trial has shown which dose works for IGF-1 LR3. The number shown here describes reported use, not a quantity established by a trial. Nothing here is a starting point, a schedule, or a recommendation.
Source: Dominikowski A, Rękoś Z, Olejarz M, Szczepanek-Parulska E, Domin R, Ruchała M. The emerging landscape of performance-enhancing peptides modulating GH-IGF1 axis: bridging the gap between clinical evidence and patient self-administration. Front Endocrinol 2026 — tabulates self-reported online dosing patterns beside the clinical doses, stating the reported values must not be read as clinically validated, regulatory-approved or safe
What matters first
What people report using, and what each figure rests on
Every published IGF-1 LR3 quantity we found, in one table. The last column is the one that matters: it says what produced the number. The rows do not carry equal weight, and the table is built so you can see which is which without being told.
| Quantity | How often | Route | Where the figure came from |
|---|---|---|---|
| 20–40 mcg | once a day, ideally after training | Under the skin | Reported use only |
Every row cites a source listed at the foot of this page. A row marked as reported is a description of what people do. It is not evidence that the quantity works, and it is not a dose this site suggests.
Where the IGF-1 LR3 number came from
A range that circulates has a history, and the history is the part sellers leave out. This is what the source behind the row above actually says about its own figure.
- The quantity on this page is the one that circulates on forums, printed in a peer-reviewed review of self-administration patterns. The review marks that row with its own footnote: no peer-reviewed clinical study reports a dosing regimen for this analogue in humans
The commercial supply of this analogue exists to serve bioprocessing.
Catalogues list it as a research and manufacturing reagent, not as a medicine. No regulator anywhere has reviewed it for use in people. A ClinicalTrials.gov search returns no registered study of it.
That is a weaker position than an unapproved drug, which at least has a trial running. Insulin-like growth factors and their releasing factors sit on the World Anti-Doping Agency prohibited list at all times. A reagent-grade certificate speaks to a bioreactor.
It says nothing about safety in a person.
What this does and does not establish
For IGF-1 LR3, this is the strongest evidence available. The two boxes separate what it can show from what it cannot show.
What it does establish
Animal studies or small reports can show that researchers are exploring the compound. They cannot show which dose works in people.
What it does not
A validated dose, schedule, duration, safety margin, or reliable figure for how long it stays in the body.
If a number appears, it describes what people report using. It is not a trial result or a recommendation. If there is no number, no study has produced one.
IGF-1 LR3 dosage in units: 20–40 mcg on a syringe
A range in micrograms is not what anyone measures. Below is the same range as a volume and a unit count. Each available vial and water combination has its own row, so match the numbers to the vial in hand. The arithmetic is fixed. The reported range is not a prescription.
| Vial + water | Concentration | Volume | Draw on a U-100 syringe | Doses in the vial |
|---|---|---|---|---|
| 0.1 mg + 1 mL | 0.1 mg/mL | 0.2–0.4 mL | 20–40 units | 5 |
| 0.1 mg + 2 mL | 0.05 mg/mL | 0.4–0.8 mL | 40–80 units | 5 |
| 1 mg + 1 mL | 1 mg/mL | 0.02–0.04 mL | 2–4 units | 50 |
| 1 mg + 2 mL | 0.5 mg/mL | 0.04–0.08 mL | 4–8 units | 50 |
The vial sizes and water volumes are the IGF-1 LR3 record’s own. The last column counts whole doses at the low end of the range. Every figure here is division applied to a quantity nobody has tested. The arithmetic being exact does not make the quantity right.
3Reference details
Which syringe barrel the units are read on
A unit is not a unit. A U-100 and a U-50 barrel both print 0.01 mL per graduation; a U-40 barrel prints 0.025 mL. The same printed number therefore measures 2.5× the volume on a U-40. That is why every unit figure on this page names its barrel. It is also why a unit count copied from someone else’s syringe means nothing on its own.
| Barrel | Capacity | One graduation | 0.2 mL reads as |
|---|---|---|---|
| U-100 insulin syringe · 1 mL · lines every 2 units | 1 mL | 0.010 mL | 20 units |
| U-100 insulin syringe · 0.5 mL · lines every 1 unit | 0.5 mL | 0.010 mL | 20 units |
| U-40 insulin syringe · 1 mL · lines every 1 unit | 1 mL | 0.025 mL | 8 units |
Barrel capacities and graduation spacing are the printed scales this site’s calculator measures against, not estimates. Three barrels carry only two scales: a U-50 is a half-length U-100, so it reads identically per unit and simply runs out sooner.
What one graduation is worth at each concentration
Reconstitution fixes a concentration, and the concentration fixes what a single graduation carries — before anyone decides what to draw. Below is every pairing of this page’s vial sizes and water volumes, as a concentration and as the mass one U-100 graduation holds at it. No dose is implied by any cell; it is division.
| Vial | + 1 mL water | + 2 mL water |
|---|---|---|
| 0.1 mg | 0.1 mg/mL1 mcg per unit | 0.05 mg/mL0.5 mcg per unit |
| 1 mg | 1 mg/mL10 mcg per unit | 0.5 mg/mL5 mcg per unit |
Vial strengths and water volumes are the IGF-1 LR3 record’s own presets. One U-100 graduation is 0.01 mL, so the mass it carries is the concentration times that volume. That is the entire reason the same milligram figure produces a different unit count in every row.
How dosing works in this class
What a reported range is, and what it is not
A reported range tells you what some people say they use. It is not a dose that a human study found safe or effective, and it is not an approved schedule.
We include the range because readers will see the same numbers elsewhere. Here, the source and the type of evidence sit beside it so you can tell a reported amount from a studied dose.
Seeing the same number on several websites does not make it stronger evidence. Those sites may be repeating one source. Do not treat a reported range as a starting dose.
How these figures usually got their shape
Most reported ranges start in an animal study. The dose there is set per kilogram of body weight, so somebody divides and multiplies it up to a person. That step is arithmetic, and it is often done without the scaling method the field uses for it.
The arithmetic travels. The biology does not. How much a body absorbs, where it goes, how fast it clears and how the receptor answers all change between a mouse and a person. None of that is carried across by multiplying.
So a converted figure is a plausible place to start a study. It is not a result.
The other common origin is a round number. Vials are sold in whole milligrams. Quantities that divide a vial neatly spread faster than quantities that do not. That is a fact about packaging, not about the compound.
Concentration changes the units, not the dose
The dose and the syringe draw are two different things. The dose is a mass in milligrams. The draw is a volume in syringe units. It depends on the concentration after mixing. Adding more bacteriostatic water changes the unit reading, but not the dose.
This matters because a unit count copied from someone else’s vial means nothing without their concentration. That mismatch is the most common way a self-injected dose ends up ten times off. The arithmetic is fixed and safe to state as fact. The dose you apply it to is a clinical decision, and it is not.
Compounded vial?
No approved IGF-1 LR3 product exists, so nothing here describes one. The calculator does arithmetic only: it converts a milligram figure and a reconstitution into a volume and a unit count, and it takes no position on which figure belongs in the box.
Open the IGF-1 LR3 calculator →Questions about IGF-1 LR3 dosing
What IGF-1 LR3 dosage do people report using?
The range documented on this page is 20–40 mcg once a day, ideally after training. It describes reported use, not a dose established by a label or a controlled human trial, and it is not a starting point or recommendation.
Has a IGF-1 LR3 dosage been established in a human trial?
No completed controlled human trial has shown which dose works for IGF-1 LR3. The number shown here describes reported use, not a quantity established by a trial.
How many syringe units is the reported IGF-1 LR3 range?
There is no unit answer without a concentration and a syringe scale. The worked draw table above converts the range only at the stated vial-and-water combinations; a different mix produces a different unit count for the same mass.
Does adding more water change the IGF-1 LR3 dose?
No. It changes the concentration and therefore the volume and syringe units needed to draw a given mass. The milligram or microgram amount does not change merely because the vial contains more water.
Why is there no IGF-1 LR3 dosage chart?
A chart would imply a sourced schedule. IGF-1 LR3 has no approved label that sets one, and the reported range on this page did not come from a controlled human trial. The page therefore reports the range and its provenance without turning it into a ladder to follow.