Localized Igf 1 transgene expression sustains hypertrophy and regeneration in senescent skeletal muscle Nature Genetics IGF 1 LR3 Peptide and Muscle Development Insulin Like Growth Factor 1 (IGF 1) and Its Monitoring in Medical Diagnostic and in Sports The mighty protein: insulin like growth factor type 1 The Physiological Society Insulin like growth factor 1 in articular cartilage repair for osteoarthritis treatment Arthritis Research & Therapy Springer Nature Link 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