Can I take Insulin like Growth Factor 1 Long R3 (IGF 1LR3) with Type 1 Diabetes Mellitus (T1DM)? IGF 1 LR3 does not promote growth in late gestation growth restricted fetal sheep American Journal of Physiology Endocrinology and Metabolism American Physiological Society IGF 1 LR3 is a powerful growth factor that helps build muscle, burn fat, and speed up recovery. It works by boosting protein synthesis, which helps muscles grow and heal faster. It also improves how What is IGF 1 LR3? LIVV