A Medical Review of IGF 1 LR3 Dosage, Side Effects and Safety Aspects 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 QK041 Recombinant human bovine porcine IGF 1 LR3 protein Attenuated glucose stimulated insulin secretion during an acute IGF 1 LR3 infusion into fetal sheep does not persist in isolated islets Journal of Developmental Origins of Health and Disease Cambridge Core IGF 1 LR3 For Sale Receptor Grade Recombinant USA Made IGF 1: Miracle Hormone or Health Hazard? Diet vs Disease