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 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 BluePeps IGF 1 LR3 2mg Peptide for Muscle Growth at Fatburners QK041 Recombinant human bovine porcine IGF 1 LR3 protein Receptor Grade IGF 1 LR3 1MG Raw Amino The 5 Best Peptides For Endurance Athletes To Boost Stamina