CJC 1295 + Ipamorelin vs IGF 1 LR3 for Muscle Growth IGF 1 LR3 forces receptor desensitization in 4 6 weeks, requiring months off before you can use it again. CJC 1295 and Ipamorelin amplify your natural IGF 1 LR3 1MG Research Peptide Laboratory Study IGF 1 LR3 1mg Insulin Like Growth Factor 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, Insulin Like Growth Factor 1 (IGF 1) and Its Monitoring in Medical Diagnostic and in Sports Frontiers Links Between Testosterone, Oestrogen, and the Growth Hormone Insulin Like Growth Factor Axis and Resistance Exercise Muscle Adaptations