The mighty protein: insulin like growth factor type 1 The Physiological Society Application and benefits of IGF 1 LR3_Chemicalbook Receptor Grade IGF 1 LR3 1MG Raw Amino IGF 1 LR3 (Insulin like Growth Factor 1 Long R3) is often called the "Holy Grail" of muscle building peptides because of its potent anabolic effects. In a Med Spa context, it is typically sought out Frontiers Sheep recombinant IGF 1 promotes organ specific growth in fetal sheep