PEG-MGF is Mechano Growth Factor wearing a polyethylene-glycol coat that resists breakdown and stretches half-life from minutes to roughly 48 to 72 hours. That turns a signal researchers could only study right at the damaged tissue into one that acts systemically. The underlying MGF effect remains contested, which makes comparing the two forms interesting in its own right.
- The PEG coat resists breakdown and extends half-life to about 48 to 72 hours, versus minutes for native MGF.PubMed: PEG-MGF
- That longer window allows systemic satellite-cell activation rather than action confined to one damaged site.PubMed: PEG-MGF
- It is studied as the systemic half of a local-plus-systemic pairing with native MGF.The Complete Peptide Guide p.80
- A rigorous replication (Fornaro 2014) found the MGF peptide had no effect on muscle cells, so benefits are unproven for both forms.Fornaro 2014 replication
- PEG slows clearance in the body but does not extend the vial window, a distinction the guide calls out explicitly.The Complete Peptide Guide p.80