# PEG-MGF

> Evidence tier C — Animal data · GH & Growth · reviewed 2026-11-08
> Source page: https://peptidemeta.com/p/peg-mgf/

Also known as: PEGylated MGF, PEG-MGF, Mechano growth factor

## Quick answers

**What is PEG-MGF?**

A PEGylated form of mechano-growth factor that extends its half-life, promoting muscle repair and satellite cell activation following exercise-induced damage. PEGylated synthetic form of the mechano growth factor (IGF-1Ec) E-domain peptide.

**How strong is the evidence for PEG-MGF?**

Tier C (animal data) on the peptidemeta evidence scale. Only cell and animal studies are published; no human trials.

**Is PEG-MGF FDA-approved?**

No. PEG-MGF is not approved by the FDA for any use.

**Is PEG-MGF banned in sport?**

Yes. PEG-MGF is prohibited in sport by the World Anti-Doping Agency under S2 (peptide hormones, growth factors, related substances and mimetics).

**How does PEG-MGF work?**

PEG-MGF is a PEGylated splice variant of IGF-1 (the Ec isoform) produced by mechanically stressed muscle tissue. It activates satellite cells and promotes their proliferation without triggering differentiation, thereby expanding the pool of muscle precursor cells available for repair.

**What is known about the safety of PEG-MGF?**

Very limited human safety data. Preclinical studies suggest localized injection site reactions.

## Key facts

- **Evidence tier:** C (Animal data)
- **FDA:** not approved
- **WADA:** prohibited (S2)
- **Peptide:** yes
- **Routes studied:** Intramuscular, Subcutaneous

## Overview

A PEGylated form of mechano-growth factor that extends its half-life, promoting muscle repair and satellite cell activation following exercise-induced damage.

## Mechanism

PEG-MGF is a PEGylated splice variant of IGF-1 (the Ec isoform) produced by mechanically stressed muscle tissue. It activates satellite cells and promotes their proliferation without triggering differentiation, thereby expanding the pool of muscle precursor cells available for repair. PEGylation extends its half-life from minutes to hours.

## Effects reported in research

_Reported outcomes, not promises; see the evidence tier._

- Accelerated muscle recovery post-exercise
- Satellite cell proliferation
- Localized muscle tissue repair
- Reduced delayed-onset muscle soreness

## Safety & unknowns

Very limited human safety data. Preclinical studies suggest localized injection site reactions. Theoretical risk of uncontrolled cell proliferation. Not FDA-approved. Banned by WADA.

## Status sources

- [PubMed: mechano growth factor](https://pubmed.ncbi.nlm.nih.gov/?term=mechano+growth+factor)
- [WADA 2026 Prohibited List](https://www.wada-ama.org/en/prohibited-list)

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Educational reference only — not medical advice. No dosing information is published. Tiers rate the strength of published evidence, not effectiveness or safety.