IGF-1 LR3

Long-acting insulin-like growth factor. Promotes hyperplasia (new muscle cells).

Route: SubQShelf life once mixed: ~30 daysCategory: Muscle / Growth

What IGF-1 LR3 is

IGF-1 LR3, or Long R3 Insulin-like Growth Factor-1, is a modified analog of native human IGF-1 designed for an extended half-life and enhanced bioavailability. It primarily exerts its effects by binding to the IGF-1 receptor, a transmembrane tyrosine kinase receptor, which then initiates intracellular signaling cascades, notably the PI3K/Akt and MAPK pathways, critical for cell growth, proliferation, and differentiation. The "LR3" modification involves an arginine substitution at position 3 and a 13 amino acid N-terminal extension, which significantly reduces its affinity for insulin-like growth factor binding proteins (IGFBPs). This decreased binding to IGFBPs allows a greater proportion of IGF-1 LR3 to remain unbound and biologically active for a longer duration, contributing to its prolonged systemic presence and sustained anabolic signaling.

In research settings, IGF-1 LR3 is typically studied for its potential role in muscle and tissue development, often with effects becoming noticeable over several weeks of consistent application. Research protocols commonly involve cycles ranging from 4 to 8 weeks, sometimes longer, to allow for observation of its effects on cellular hyperplasia, the formation of new muscle cells, and overall tissue repair processes. It is sometimes explored in conjunction with other research compounds to investigate synergistic effects on body composition. Researchers monitor outcomes such as muscle cell proliferation, nitrogen retention, and recovery, always within controlled study parameters. It is crucial to remember that IGF-1 LR3 is strictly a research peptide and is not approved for human medical use or consumption.

Commonly reported effects

Muscle hyperplasia
Recovery
Fat metabolism

Reported side effects & considerations

Hypoglycemia risk
Organ growth if abused

Storage & handling

LYOPHILIZED (unopened): store at 2-8°C (fridge) or -20°C (freezer) long-term. Protect from light.

AFTER RECONSTITUTION: refrigerate 2-8°C. Do NOT freeze. Discard after 30 days OR if the solution becomes cloudy, discolored, or contains particulates.

What people track

Because individual responses vary so much, the useful thing is your own record: what you logged and when, how much is left in the vial, and how your chosen metrics move over the weeks. Peptide Wizard keeps all of that in one place, alongside a 3D reference vial for IGF-1 LR3.

FAQ

What is IGF-1 LR3?

Long-acting insulin-like growth factor. Promotes hyperplasia (new muscle cells).

What do people commonly report with IGF-1 LR3?

Commonly reported effects include muscle hyperplasia, recovery, fat metabolism.

How should IGF-1 LR3 be stored?

LYOPHILIZED (unopened): store at 2-8°C (fridge) or -20°C (freezer) long-term. Protect from light.

How do I keep track of IGF-1 LR3 in my research log?

Peptide Wizard lets you record each entry, keep a vial ledger so you know what's left, and chart your own metrics over time. It is a logbook and reference only — it does not calculate or recommend doses.