IGF-1 LR3 (IGF-LR3) is a research-grade reference compound supplied for in-vitro laboratory study. IGF-1 LR3 is an 83-amino-acid analog of insulin-like growth factor-1 with extended half-life and reduced binding-protein affinity, and is widely referenced in cell-proliferation, anabolic-signaling, and growth-factor research models. For research use only. Not for human or veterinary consumption.