Exploring the Therapeutic Potential of Targeting GH and IGF 1 in the Management of Obesity: Insights from the Interplay between These Hormones and Metabolism 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 IGF 1 LR3 1mg Insulin Like Growth Factor LR3 IGF 1 (Human), Recombinant Protein, CHO, Tag Free