Effects of IGF1 isoforms on muscle growth and sarcopenia Ascenzi 2019 Aging Cell Wiley Online Library IGF 1 LR3 Muscle Growth & Performance The Biohacker Effects of IGF1 isoforms on muscle growth and sarcopenia Ascenzi 2019 Aging Cell Wiley Online Library 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 Oral delivery of novel human IGF 1 bioencapsulated in lettuce cells promotes musculoskeletal cell proliferation, differentiation and diabetic fracture healing ScienceDirect