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 Recombinant Human LR3 IGF I IGF 1 GMP Protein, CF 8335D GMP: R&D Systems 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 IGF1 LR3 Peptide Anderson Longevity Clinic IGF1 LR3 Peptide Review: Benefits, Before & After, Dose, & More