Frontiers Dual Characters of GH IGF1 Signaling Pathways in Radiotherapy and Post radiotherapy Repair of Cancers Mechanisms of putative IGF I receptor resistance in active acromegaly ScienceDirect 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 Cycle: What to Expect The Peptide Report