40 YEARS OF IGF1: Insulin like growth factors: actions on the skeleton in: Journal of Molecular Endocrinology Volume 61 Issue 1 (2018) 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 Frontiers Regulation of IGF 1 signaling by microRNAs IGF 1 LR3 does not promote growth in late gestation growth restricted fetal sheep American Journal of Physiology Endocrinology and Metabolism American Physiological Society Mechano growth factor, a splice variant of IGF 1, promotes neurogenesis in the aging mouse brain Molecular Brain Springer Nature Link