Frontiers Sheep recombinant IGF 1 promotes organ specific growth in fetal sheep Role of insulin like growth factor 1 receptor signalling in cancer British Journal of Cancer 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 IGF 1 LR3 does not promote growth in late gestation growth restricted fetal sheep American Journal of Physiology Endocrinology and Metabolism American Physiological Society IGF 1 LR3 1MG Beverly Hills Rejuvenation Center Cartilage Targeted IGF 1 Treatment to Promote Longitudinal Bone Growth ScienceDirect