MGF (Mechano Growth Factor)
Splice variant of IGF-1 produced by muscle in response to mechanical loading and damage. Triggers satellite cell activation. Short half-life — superseded for most use cases by PEG-MGF.
MGF is a splice variant of IGF-1 your muscle makes after damage. Tells satellite cells to wake up and rebuild. The unmodified version clears in minutes, so it only works locally — most users prefer PEG-MGF for systemic effect.
IGF-1 derivative. Universally banned in tested sport.
Not FDA approved as a drug.
FDA flagged as significant safety risk; restricted from compounding pharmacies.
Falls under the S2 IGF / growth factor category.
Not prescribed in conventional medicine.
Who it's for
- →Lifters experimenting with site-specific muscle anabolism
- →Post-injury muscle recovery contexts
- →Researchers preferring short-acting MGF over PEGylated version
What to expect
- Week 1
Acute pumps and fullness in worked muscle.
- Week 4
Subjective recovery improvements. Site-specific tissue responses.
- Week 8
Cycle endpoint reached. Receptor desensitization ramping.
How it works (mechanism)
Splice variant of IGF-1 produced locally by muscle in response to mechanical loading. Activates satellite cells (muscle stem cells) to proliferate and fuse, the basis of damage-driven hypertrophy. Native form is metabolized in minutes.
Dosing protocol
100-200 mcg sub-q post-workout, near the trained muscle.
Stacks well with
Side effects
When NOT to use
- ⚠Active malignancy
- ⚠Diabetic retinopathy
- ⚠Pregnancy / nursing
Bloodwork to monitor
- • IGF-1 baseline + at week 4
- • Fasting glucose every 2 weeks
Common mistakes
- • Treating it as long-acting (it isn't — it's metabolized in minutes)
- • Confusing it with PEG-MGF (different kinetics)
- • Long cycles without breaks
Drug & supplement interactions
- ⚠Insulin: hypoglycemia risk
- ⚠Short half-life means fewer chronic interaction concerns
Educational only. User-specific dosing is between you and a qualified provider.
Frequently asked
What is MGF (Mechano Growth Factor)?+
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