Insulin Like Growth Factor 1 (IGF 1) and Its Monitoring in Medical Diagnostic and in Sports Late life targeting of the IGF 1 receptor improves healthspan and lifespan in female mice Nature Communications Insulin like growth factor 1 promotes cell cycle progression via upregulation of cyclin D1 expression through the phosphatidylinositol 3 kinase nuclear factor B signaling pathway in FRTL thyroid cells Acta Pharmacologica Sinica Recombinant Human LR3 IGF I IGF 1 GMP Protein, CF (8335D GMP) by R&D Systems, Part of Bio Techne IGF 1 LR3 tells your muscle cells to grow, repair, and absorb nutrients better. It works directly at the muscle level to help you build lean muscle and recover faster.What it is IGF 1