# IGF-1 LR3: track every shot, units to draw and what's still active

> Reconstitution calculator, daily schedule, site rotation and half-life chart for IGF-1 LR3. Track it in Peppy, private on your iPhone.

Source: https://peppytracker.com/compounds/igf-1-lr3/
Last updated: 2026-09-02

Long R3 IGF-1 analog modified to bind IGFBPs less effectively, extending biological half-life relative to native IGF-1; researched for muscle growth and tissue repair. In the Peppy catalog, IGF-1 LR3 is reconstituted from a vial and drawn up in units on an insulin syringe, dosed in mcg, typically daily, with a listed half-life of about 24 hours.

## Frequently asked

### How many units is 20 mcg of IGF-1 LR3?

It depends on how the vial was mixed. Example: a 1 mg vial plus 2 mL of bacteriostatic water is 0.5 mg/mL, so 20 mcg is 0.04 mL, or **4 units** on a U-100 insulin syringe. Change the water and the units change. Use the calculator above with your own vial, and verify with your prescriber.

### How long does IGF-1 LR3 stay in your system?

The Peppy catalog lists a half-life of about 24 hours for IGF-1 LR3. After roughly five half-lives, about 5 days, most of a single dose has cleared. That is an estimate from the half-life, not a measurement, and individual clearance varies.

### Can I track IGF-1 LR3 in Peppy?

Yes. IGF-1 LR3 is one of 123 compounds built into Peppy, with its form, unit and typical frequency prefilled. Add it as a protocol, set your schedule, and Peppy handles the countdown, the log and the reminders (Pro).

### Where should I inject IGF-1 LR3?

Follow your prescriber's instructions. For subcutaneous shots the GLP-1 labels list the abdomen, thigh and upper arm and say to rotate. Peppy's body map has 13 sites, suggests the next one, and shows when each was last used. Read the [site rotation guide](https://peppytracker.com/guides/injection-site-rotation/).

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Peppy is a tracking tool, not medical advice. Dose calculations are mathematical conversions only. Always follow your prescriber's instructions and verify every draw-up yourself.

Peppy is a free iPhone app (Pro subscription optional). App Store: https://apps.apple.com/us/app/peptide-tracker-peppy/id6775005514