IGF-1 LR3

Growth Factor (IGF/MGF)Research Use Only

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

IGF-1 LR3 is a modified analog of insulin-like growth factor 1 engineered with an extended amino-terminal sequence and an arginine substitution that reduce binding to IGF-binding proteins, prolonging its activity. It is commonly referenced in research literature studying cell growth and anabolic signaling. This entry is educational and research-use-only and is not medical advice.

Typical range (research)

Commonly referenced in literature around 20–50 mcg per day (research reference only)

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

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Dose figures are ranges commonly referenced in research literature, not recommendations or medical advice. Not for human or veterinary use. Consult a licensed physician.