HGH vs IGF 1 LR3: Scientific Comparison & Research Guide This Peptide Is Next Level for Growth & Recovery Meet IGF LR3 the long acting insulin like growth factor that researchers can't stop talking about. From muscle growth to cellular repair , IGF 1 LR3 does not promote growth in late gestation growth restricted fetal sheep American Journal of Physiology Endocrinology and Metabolism American Physiological Society 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 HGH & Peptides Deus Medical