Attenuated glucose stimulated insulin secretion during an acute IGF 1 LR3 infusion into fetal sheep does not persist in isolated islets Journal of Developmental Origins of Health and Disease Cambridge Core IGF 1 LR3 and Penis Enlargement: What the Evidence Actually Shows IGF 1 LR3 Dosage Protocol PeptideDosages.com 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 doesn't give a rush, it rewires recovery. Over a few weeks, muscles feel fuller, soreness fades faster, and joints stop aching. Workouts hit harder without wrecking you after. Skin heals