Muscle

MGF

MGF / PEG-MGF (Mechano Growth Factor)

A splice variant of the IGF-1 gene expressed in muscle in response to mechanical stress. Activates muscle satellite cells at the site of damage.

MGF is not approved by the FDA for human use. It is sold strictly for research purposes only and is not intended for human consumption, diagnosis, treatment, or prevention of any disease or condition. Purchase and use is entirely at your own risk.

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What it is

Mechano Growth Factor (MGF) is produced by the body as an alternative splice variant of the IGF-1 gene specifically in response to mechanical stimulation (i.e., exercise or muscle damage). Unlike systemic IGF-1, which circulates throughout the body, MGF acts locally at the site of muscle damage.

In research, two forms are studied: native MGF (very short plasma half-life of approximately 5 minutes) and PEG-MGF (pegylated version with extended half-life of 24–72 hours). The latter allows systemic delivery that mimics the local signal more practically.

What research shows

Activates muscle satellite cells — dormant stem cells that fuse with damaged muscle fibers to enable repair and growth
Local activity at muscle damage sites — mechanistically distinct from systemic IGF-1
Muscle fiber protection and recovery in animal models
PEG-MGF extends half-life sufficiently for practical research use
Potentially additive with IGF-1 LR3 through complementary mechanisms

What remains unknown

Optimal dosing and timing relative to training in humans
Long-term safety profile
Whether systemic PEG-MGF delivery adequately replicates localized MGF signaling

Administration basics

Common use cases

Muscle repair, satellite cell activation, recovery from training. Typically used post-workout.

Half-life

~5 minutes (MGF) / 24–72 hours (PEG-MGF).

Administration

Intramuscular injection into the target muscle. Post-workout timing is standard.

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Research Protocols & Common Usage

Doses used in research

Animal research has used 200–400mcg per injection
PEG-MGF community protocols commonly report 200mcg injected 2–3 times per week

Administration routes studied

Intramuscular injection (often at the targeted muscle site)Subcutaneous injection

Typical protocol duration

Community protocols typically report 4–6 week cycles.

Common stacking protocols

MGF + IGF-1 LR3 — MGF first to activate satellite cells, then IGF-1 LR3 for proliferation
MGF + GH peptides (Ipamorelin/CJC-1295) — combined in performance protocols

Contraindications & combinations to avoid

Active cancer or cancer history — MGF acts through the IGF-1 receptor pathway
Should not be combined with insulin without medical supervision

Dosing information reflects doses used in published research and commonly reported community protocols only. This is not a personal recommendation. These compounds are not FDA-approved for human use in the contexts described. Consult a qualified healthcare provider before starting any protocol.

Considering stacking?

See the stacking guide for common combinations with MGF and what to avoid.

Stacking guide

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Community Reviews

Reviews reflect individual user experiences with research compounds and are not medical advice. Results vary. These compounds are not FDA approved for human use. Peptelligent does not verify reported experiences.

MGF