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 does not promote growth in late gestation growth restricted fetal sheep American Journal of Physiology Endocrinology and Metabolism American Physiological Society Recombinant human IGF 1 LR3 protein (Qk041) Qkine Recombinant human IGF 1 LR3 protein (Qk041) 100 Organ weights in response to Long R3 insulin like growth factor 1 (LR3 Download Scientific Diagram