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 PEG MGF Peptide Therapy IGF 1 LR3 The Muscle Building Peptide Everyones Talking About , IGF 1 LR3 is one of the most powerful performance peptides used for muscle growth, recovery, and fat loss. Its a modified version Mechano growth factor, a splice variant of IGF 1, promotes neurogenesis in the aging mouse brain Molecular Brain Springer Nature Link