IGF 1 LR3 1MG Research Peptide Laboratory Study Recombinant Human LR3 IGF I IGF 1 GMP Protein, CF 8335D GMP: R&D Systems All Natural Hormone Hacks for Muscle Growth & Fat Loss: T, HGH, Cortisol, IGF 1, Insulin, T3 & More! 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, Modulatory activity of testosterone on growth pattern and IGF 1 levels in vanishing testis syndrome: a case report during 15 years of follow up BMC Endocrine Disorders Springer Nature Link