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 Therapy Improves Muscle Size and Function in Experimental Peripheral Arterial Disease JACC: Basic to Translational Science IGF 1 LR3 Injection Benefits And How It Works The HCG Institute Personal experience with igf1 lr3 peptide? The mighty protein: insulin like growth factor type 1 The Physiological Society