Explanation, Benefits, and Dosing for IGF LR3 Wittmer Rejuvenation Clinic 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 Attenuated glucose stimulated insulin secretion during an acute IGF 1 LR3 infusion into fetal sheep does not persist in isolated islets Journal of Developmental Origins of Health and Disease Cambridge Core Frontiers Sheep recombinant IGF 1 promotes organ specific growth in fetal sheep IGF 1 Therapy Improves Muscle Size and Function in Experimental Peripheral Arterial Disease JACC: Basic to Translational Science