IGF 1 LR3 Cycle: What to Expect The Peptide Report Most lifters think muscle growth happens during the workout., It doesnt., Growth happens after when repair signals are turned on., Thats where PEG MGF shines., This peptide works at the cellular IGF 1 LR3 does not promote growth in late gestation growth restricted fetal sheep American Journal of Physiology Endocrinology and Metabolism American Physiological Society MGF Peptide Therapy: Build Muscle and Recover Faster After Workouts Revolution Health & Wellness