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 IGF 1 LR3 Peptide Therapy Muscle Growth & Recovery Esthetic Solutions Organ weights in response to Long R3 insulin like growth factor 1 (LR3 Download Scientific Diagram Recombinant human IGF 1 LR3 protein (Qk041) 100