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 IGF 1 LR3 vs GH Peptides The Battle Between Performance & Risk IGF 1 LR3 Superior Peptide IGF 1 LR3 tells your muscle cells to grow, repair, and absorb nutrients better. It works directly at the muscle level to help you build lean muscle and recover faster.What it is IGF 1