Frontiers Growth Hormone and Insulin Like Growth Factor Action in Reproductive Tissues IGF 1 LR3 The Muscle Building Peptide Everyone's Talking About IGF 1 LR3 is one of the most powerful performance peptides used for muscle growth, recovery, and fat loss. It's a modified version Pediatric Implications of Normal Insulin GH IGF Axis Physiology Endotext NCBI Bookshelf Insulin like growth factor 1 deficiency and metabolic syndrome Journal of Translational Medicine Springer Nature Link IGF 1 LR3 does not promote growth in late gestation growth restricted fetal sheep American Journal of Physiology Endocrinology and Metabolism American Physiological Society Powerock Pharma PEG MGF 5mg