IGF 1 LR3 Injection Benefits And How It Works The HCG Institute The Actions of IGF 1 in the Growth Plate and Its Role in Postnatal Bone Elongation Current Osteoporosis Reports Springer Nature Link 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, IGF 1 Facilitates Cartilage Reconstruction by Regulating PI3K AKT, MAP JIR Dove Medical Press