Frontiers Mini Review: Effect of GLP 1 Receptor Agonists and SGLT 2 Inhibitors on the Growth Hormone IGF Axis IGF LR3 is a peptide that play a role in muscle growth, tissue repair and recovery. But like all peptide therapies, it's not one size fits all. We focus on using peptides thoughtfully and in the IGF 1 LR3 Supra Chems Buy IGF 1 LR3 Pre Mixed Pen 1mg 40 YEARS OF IGF1: Insulin like growth factors: actions on the skeleton in: Journal of Molecular Endocrinology Volume 61 Issue 1 (2018) 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,