IGF-1 LR3 is a long-acting insulin-like growth factor analog studied in growth and recovery research contexts. It arrives as a lyophilized powder, and because it is dosed in micrograms, the reconstitution ratio is usually chosen to keep small doses readable on a U-100 insulin syringe.
Research-context information only. IGF-1 LR3 is a research chemical without FDA approval as a finished pharmaceutical product. The reconstitution math below reflects vendor documentation and community-reported protocols. Research sources describe growth-factor and recovery applications; outcome claims are not supported by FDA-approved indications. This article reports what has been documented, not what should be done. Consult a licensed physician for personal medical decisions.
IGF-1 LR3 vial sizes
IGF-1 LR3 is most commonly available in 1mg (1000 mcg) lyophilized vials in the research peptide market, with some vendors offering 0.1mg or 0.5mg formats. The lyophilized peptide appears as a white powder or cake. With a molecular weight of approximately 9,111 Da, IGF-1 LR3 is a larger peptide than most GH secretagogues.
Community sources cite microgram-scale doses — commonly around 20-50 mcg per administration. Because the per-dose amount is so small, the bacteriostatic water ratio is the main lever for keeping each dose measurable on the syringe.
Reconstitution math
1mg (1000 mcg) vial
| Bac water added | Concentration | 25 mcg dose | 50 mcg dose |
|---|---|---|---|
| 1 mL | 1000 mcg/mL | 2.5 units | 5 units |
| 2 mL | 500 mcg/mL | 5 units | 10 units |
Community sources cite 1 mL of bacteriostatic water for a 1mg vial (1000 mcg/mL) when fewer, larger draws are used, and 2 mL (500 mcg/mL) when finer measurement of small doses is the priority. At 500 mcg/mL, a 50 mcg dose lands on the clean 10-unit mark — the reason this ratio is frequently cited for IGF-1 LR3.
Concentration summary
| Vial size | Bac water | Concentration | Units per 10 mcg |
|---|---|---|---|
| 1 mg | 1 mL | 1000 mcg/mL | 1 unit |
| 1 mg | 2 mL | 500 mcg/mL | 2 units |
Step-by-Step Reconstitution
- Allow the vial and the bacteriostatic water to reach room temperature (community sources cite 15-20 minutes out of the refrigerator).
- Wipe both rubber stoppers with a fresh alcohol swab.
- Draw the chosen bacteriostatic water volume into a syringe.
- Insert the needle at an angle so the water runs down the inside glass wall rather than onto the powder directly.
- Let the powder dissolve, then swirl gently. Do not shake.
- The solution should be clear and colorless; cloudiness or particulate after gentle swirling is cited as a signal to discard.
Storage After Reconstitution
Community sources cite 28 days of refrigerated stability at 2-8 degrees Celsius for reconstituted IGF-1 LR3, consistent with the bacteriostatic water's USP multi-dose window. Lyophilized, unreconstituted vials are described as stable for months at freezer temperatures.
Common Mistakes (Community Reports)
These are anecdotal patterns reported in community sources, not clinical findings:
- Reconstituting too concentrated. Reports describe 1000 mcg/mL solutions making small 25-50 mcg doses hard to draw accurately at only 2.5-5 units.
- Shaking the vial. Foaming and degradation concerns are cited; gentle swirling is the consistently described method.
- Skipping aseptic technique. Because the vial is used in many small draws over weeks, reports emphasize swabbing the stopper before every draw.
Bottom Line
For a 1mg IGF-1 LR3 vial, community sources cite 1 mL of bacteriostatic water (1000 mcg/mL) or 2 mL (500 mcg/mL). The 500 mcg/mL ratio puts common 25 mcg and 50 mcg doses on clean syringe marks, which is why it's frequently preferred. Reconstituted solution holds for the 28-day refrigerated multi-dose window.