Prolonged Fasting Reduces IGF 1 PKA to Promote Hematopoietic Stem Cell Based Regeneration and Reverse Immunosuppression ScienceDirect 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 BluePeps IGF 1 LR3 2mg Peptide for Muscle Growth at Fatburners PEG MGF Pegylated Mechano Growth Factor