What is the effect of Insulin like Growth Factor 1 (IGF 1) Long Arg3 (LR3) on muscle growth? Igf 1 Lr3 Injection Liquid, 10 Vials Per Bottle Dosage As Per Doctor Prescription, Suitable For Adults Liquid, 10 Vials Per Bottle Dosage As Per Doctor Prescription, Suitable IGF 1 LR3 Injection Benefits And How It Works The HCG Institute 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