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 Frontiers Sheep recombinant IGF 1 promotes organ specific growth in fetal sheep The Fascinating Interplay between Growth Hormone, Insulin Like Growth Factor 1, and Insulin 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