PEG-MGF (Pegylated MGF)
PEG-MGF
Pegylated mechano growth factor with extended half-life versus native MGF; used for recovery research.
Key takeaways
- PEGylated MGF: same satellite-cell peptide, half-life stretched to ~19 hours (estimated).
- Longer action allows weekly-ish dosing but loses the local, pulsatile character of native MGF.
- Zero human studies; all dosing numbers are community extrapolations from animal work.
- WADA-prohibited as a growth factor under S2.3.
Overview
What it is
PEG-MGF is mechano growth factor, the IGF-1Ec splice variant muscle releases after overload, with a polyethylene glycol chain attached. PEGylation shields the peptide from rapid enzymatic breakdown. Like native MGF, it targets satellite-cell activation and local repair signaling.
Pharmacokinetics
PEGylation stretches the half-life from roughly 30 minutes to an estimated 19 hours, with subcutaneous bioavailability near 60%. The longer residence supports once- or twice-weekly dosing instead of the post-workout timing native MGF requires.
What the evidence says
No human trials or registered human studies exist for PEG-MGF. Support comes from rodent muscle-injury models and in vitro satellite-cell work, with the PEGylation pharmacology inferred from better-characterized PEGylated drugs. It isn't an approved medication, and WADA prohibits growth factors for tested athletes.
Reported dosing protocols
Protocols reported in research literature and clinic/community use — informational context, not a dosing recommendation.
| Use case | Dose | Route | Frequency | Duration |
|---|---|---|---|---|
| Recovery / muscle repair (community) | 200–400 mcg | SubQ | 1–2× weekly | 4–6 weeks |
Pharmacokinetic summary
- Model tier
- Simple (t½ + F, Tmax estimated)
- Half-life
- 19.2 hours
- Bioavailability
- 60%
- Typical dose
- 0.2–0.8 mg
Frequently asked questions
Why pegylate MGF at all?
Native MGF degrades within minutes, which makes practical dosing nearly impossible. Attaching a PEG chain is a standard drug-delivery trick that slows enzymatic breakdown and clearance, stretching the half-life from minutes to roughly a day.
Is PEG-MGF better than regular MGF?
Different, not proven better. PEG-MGF is convenient, but animal biology suggests MGF works as a short local pulse after damage. Whether a day-long systemic exposure preserves that repair signaling is untested, and no human data exists for either form.
Is PEG-MGF banned in sport?
Yes. WADA prohibits growth factors and their mimetics under section S2.3, which covers MGF and pegylated variants. The MGF E-domain peptide is detectable in urine by LC-MS, so tested athletes should treat it as a clear anti-doping violation.
References
- Estimated — PEGylation extends the short MGF half-life considerably.
- Tang et al., 2017 — mechano growth factor promotes neurogenesis in the aging mouse brain — MGF biology; PEG-MGF itself has no published human studies.
- Frontiers in Physiology 2015 — satellite cells in human skeletal muscle plasticity — Reviews IGF-1 splice variants including MGF in muscle regeneration.
Related compounds
MGF (Mechano Growth Factor)
IGF-1 splice variant produced in response to mechanical load; involved in muscle repair signaling.
IGF-1 DES
Truncated, highly potent IGF-1 variant with very short half-life; site-injection research compound.
IGF-1 LR3
Long-acting IGF-1 analog engineered to resist binding proteins; muscle-growth research compound.
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