Same Origin, Completely Different Research Profiles MGF and PEG MGF both come from the same IGF 1 gene. But one lasts 7 minutes and the other lasts 3 days. Here is what that difference IGF 1 LR3 + MASS Cycle = CRAZY Growth? #askDave 40 YEARS OF IGF1: Insulin like growth factors: actions on the skeleton in: Journal of Molecular Endocrinology Volume 61 Issue 1 (2018) Buy IGF 1 LR3 High Quality 99% Pure Peptide Works Mechano growth factor, a splice variant of IGF 1, promotes neurogenesis in the aging mouse brain Molecular Brain Springer Nature Link Mechanisms of IGF 1 Mediated Regulation of Skeletal Muscle Hypertrophy and Atrophy