algorx RUO Recombinant Human IGF 1 LR3 Protein Measurement of IGF 1 by MSIA SRM 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 , What is IGF 1 LR3?, Insulin Like Growth Factor 1 Long R3 (IGF 1 LR3) is a modified version of IGF 1 with a longer half life, making it significantly more potent and effective for muscle growth,