How the IGF-1 LR3 calculator works
Lyophilized (freeze-dried) powder in very small amounts, often labelled in micrograms rather than milligrams. The quick-fill buttons in the calculator are the vial sizes IGF-1 LR3 is commonly labelled in (0.1 mg and 1 mg). If yours is different, type it in.
Amounts of IGF-1 LR3 are usually written in micrograms (mcg), so the calculator opens in mcg.
A vial labelled 100 mcg is 0.1 mg, and a vial labelled 1,000 mcg is 1 mg. The calculator’s vial field is in mg. Product instructions may name a diluent other than bacteriostatic water. The arithmetic depends only on the volume added.
For a field-by-field walkthrough and a guide to syringe types, see the main peptide calculator.
IGF-1 LR3 concentration table
Each labelled vial size at the same three round water volumes used across this site. It shows how the arithmetic behaves and is not a suggestion of what to use.
| Vial | Water added | Concentration | Each mark holds |
|---|---|---|---|
| 0.1 mg vial | 1 mL | 0.1 mg/mL | 1 mcg per unit |
| 0.1 mg vial | 2 mL | 0.05 mg/mL | 0.5 mcg per unit |
| 0.1 mg vial | 3 mL | 0.03 mg/mL | 0.3 mcg per unit |
| 1 mg vial | 1 mL | 1 mg/mL | 10 mcg per unit |
| 1 mg vial | 2 mL | 0.5 mg/mL | 5 mcg per unit |
| 1 mg vial | 3 mL | 0.33 mg/mL | 3.3 mcg per unit |
Every row for a given vial holds the same total. To compare volumes for a specific reading, use the BAC water calculator.
The formula, step by step
The “Try example numbers” button uses one fixed rule on every page: the smallest labelled vial, 2 mL of water, and whatever amount lands on the 10-unit mark. The amount is a by-product of that rule and not a typical or suggested IGF-1 LR3 dose.
- Concentration: 0.1 mg ÷ 2 mL = 0.05 mg/mL.
- The 10-unit mark is 10 ÷ 100 = 0.1 mL, which holds 0.1 × 0.05 = 0.005 mg (5 mcg).
- Run it forwards to check: 0.005 mg ÷ 0.05 mg/mL = 0.1 mL, and 0.1 × 100 = 10 units.
IGF-1 LR3: general reference
General educational reference for research purposes only. None of it is a recommendation, none of it is medical advice, and none of it is used by the calculator, which works only on the numbers you enter.
IGF-1 LR3 is a lengthened analog of human insulin-like growth factor 1. It has the full IGF-1 sequence with one amino acid swapped (arginine at position 3) and 13 extra amino acids at the front, 83 in total.
It was developed in the early 1990s by the Australian company GroPep as a supplement for growing cells in the laboratory, and that remains its established use.
The changes cut its binding to the body’s IGF-binding proteins by more than a hundredfold, which is why it behaves differently from natural IGF-1.
It has not been approved as a medicine. The approved form of IGF-1 is a different product, mecasermin.
- Class
- 83-amino-acid analog of IGF-1
- Group
- Growth hormone and IGF-1 axis
- Also known as
- Long R3 IGF-1, LR3-IGF-1
- Molecular weight
- About 9,118 Da
- Half-life
- Not established in humans. Figures of 20 to 30 hours are widely repeated, but they do not come from a published human pharmacokinetic study.
- Regulatory status
- Not approved as a medicine. IGF-1 LR3 is not approved as a medicine by the FDA, the EMA or any other major regulator. It is sold as a laboratory reagent for cell culture.
- Status in sport
- Prohibited at all times under the WADA Prohibited List (section S2), which covers IGF-1 and its analogues.
- Labelled vial sizes
- 0.1 mg and 1 mg
Arithmetic slips to watch for with IGF-1 LR3
The vial itself may be labelled in mcg
Most peptide vials are labelled in milligrams. IGF-1 LR3 is often labelled in micrograms, so the first conversion happens before anything is typed: 100 mcg is 0.1 mg. Entering 100 in a field that expects mg would be wrong by 1,000×.
Very low concentrations
A 0.1 mg vial in 1 mL is 0.1 mg/mL, which is just 1 mcg per unit on a U-100 syringe. A 1 mg vial in the same 1 mL is 10 mcg per unit. At these scales a single unit is a meaningful fraction of a small amount.
The diluent does not change the arithmetic
Whatever liquid the product instructions call for, the concentration is still the milligrams divided by the millilitres added. The calculator labels the field as BAC water, but it only uses the volume.
What this page does not do
The calculator performs mathematical conversions only. It does not recommend, suggest or verify any IGF-1 LR3 dose or schedule, it does not say how much water to add, and it does not say what IGF-1 LR3 is for, whether it is safe, or whether it is legal where you live. It is not medical advice, diagnosis or treatment, and Peptrack does not sell, supply or endorse any substance.
Always confirm measurements with a licensed healthcare provider or pharmacist. See the full disclaimer.
Sources
Facts last checked: September 2026. Regulatory status changes, so check the regulator’s own pages for the current position.
