IGF 1 LR3: Nasal Spray vs. Subcutaneous Injection Comparison Most people think all peptides = fat loss., Thats not even close., IGF 1 LR3 isnt about burning tissue its about building it., This is the signal that tells muscle fibers to:, Recover faster, 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 Cell proliferation bioactivity of purified IGF 1 LR3 IGF 1. (A) Download Scientific Diagram Recombinant Human LR3 IGF I IGF 1 GMP Protein, CF 8335D GMP: R&D Systems