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IGF-1 LR3

Growth Factor (IGF/MGF)Research Use Only

Also known as: Long R3 IGF-1, Long Arg3 IGF-1

A long-acting version of IGF-1 (the growth factor GH works through), studied for muscle growth and recovery.

Dosing quick reference

research reference
Starting dose
20 mcg once daily
Frequency
Once daily (morning or post-workout, with food)
Typical range
20–50 mcg per day
Cycle
8 weeks on, then take a break
Titration (step-up)
Wk 1–2: 20 → Wk 3–4: 40 → Wk 5–8: 50 mcg
Can lower blood sugar — researched alongside food for that reason.
Half-life
~20–30 hours (extended relative to native IGF-1)
Route
Subcutaneous or intramuscular (research)
Common use
Studied as a long-acting IGF-1 analog in cell-growth and anabolic-signaling research
Common vial sizes
1 mg
Storage
Lyophilized powder stored frozen or refrigerated away from light; reconstituted solution refrigerated (2–8 °C) and used within a few weeks
Stacking notes
Sometimes discussed alongside growth-hormone secretagogues in research contexts

Reported side effects

Hypoglycemia-type symptoms cited in studiesInjection-site reactionLightheadedness reported anecdotally
Regulatory note: Not an approved therapeutic; prohibited in competitive sport under WADA; sold for research purposes only
Calculate a dose →IGF-1 LR3 on The Peptide Guide →Deeper research reference: literature dose ranges, storage and handling, and where to source in Canada.

Dose figures are ranges commonly referenced in research literature, not recommendations or medical advice. Research-only labeling does not establish that a substance is safe, approved or appropriate for personal use. Consult a qualified healthcare professional about health decisions.