Pegylated Mechano Growth Factor
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PEG-MGF is a pegylated form of the IGF-1 splice variant E-domain (mechano growth factor); the PEGylation extends the native minutes-long half-life to around 24 hours. Preclinical work suggests it may activate muscle satellite cells and support fiber repair, but there are no human trials, and the commonly cited benefits are extrapolated from rodent and in-vitro data. It remains a popular but entirely unproven bodybuilding research peptide.
