IGF-1 LR3 (Long R3 Insulin-like Growth Factor-1) is an 83-amino-acid synthetic peptide analog of human IGF-1. Engineered to avoid binding to IGF-binding proteins, it has an extended half-life of 20–30 hours. Typically sold as a 1mg lyophilized powder, it is reconstituted with bacteriostatic water.
Core Properties & Characteristics
- Potency: Approximately three times more potent than naturally occurring IGF-1.
- Mechanism: Binds directly to the IGF-1 receptor to promote cellular growth, muscle repair, and amino acid transport.
- Metabolism: Primarily known to direct nutrients toward muscle cells rather than adipose (fat) tissue.




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