IGF 1 LR3 Peptide and Muscle Development 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 Follow for more info on how to optimize your body. IGF 1 LR3 is one of the most misunderstood compounds in the entire space. People either treat it like a magic shortcut or 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 IGF1 LR3 Peptide Anderson Longevity Clinic