All Natural Hormone Hacks for Muscle Growth & Fat Loss: T, HGH, Cortisol, IGF 1, Insulin, T3 & More! Application and benefits of IGF 1 LR3_Chemicalbook 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 does not promote growth in late gestation growth restricted fetal sheep American Journal of Physiology Endocrinology and Metabolism American Physiological Society