Local application of engineered insulin like growth factor I mRNA demonstrates regenerative therapeutic potential in vivo ScienceDirect Frontiers Sheep recombinant IGF 1 promotes organ specific growth in fetal sheep QK041 Recombinant human bovine porcine IGF 1 LR3 protein 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 Switched things up and have been using my IGF 1 LR3 30 mins pre workout and have been noticing longer lasting pumps and more vascularity so far! 2 more weeks until I cycle