Research Use Only. Not FDA-approved; sold only as a research chemical. Many performance-adjacent peptides are also WADA-prohibited for tested athletes. Educational only — not medical advice.
What it is
IGF-1 LR3 (Long R3 IGF-1) is an engineered, longer-acting analog of insulin-like growth factor 1, used mainly as a cell-culture reagent.
Proposed mechanism
It activates the IGF-1 receptor to drive cell growth/proliferation; the LR3 modifications reduce binding to IGF-binding proteins, extending its activity.1 Growth-factor signaling carries theoretical proliferation risks.
State of the evidence
Lab reagent; no human therapeutic evidence.
Regulatory & status
Not approved; RUO. WADA-prohibited (S2).
Reconstitution (reference only)
Lab-handling reference only — not a preparation or dosing instruction: 2.5 mL (250 units) reconstitution solution. See the reconstitution calculator for the arithmetic. This page does not provide dosing guidance.
For educational and research purposes only. This content is not medical advice. Compounds referenced are research use only and not intended to diagnose, treat, cure, or prevent any disease. Free Peptide University does not sell compounds.