Huma Peptide IGF 1 LR3 Lean Muscle Growth & Recovery Frontiers Growth hormone insulin like growth factor I axis in health and disease states: an update on the role of intra portal insulin 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 Insulin Like Growth Factor 1 (IGF 1) and Its Monitoring in Medical Diagnostic and in Sports IGF 1 LR3 EQUINE MEDCARE