# MGF (Mechano Growth Factor)

> MGF, or mechano growth factor, is a splice variant of the IGF-1 gene (also referred to as IGF-1Ec) that is naturally expressed in skeletal muscle in response to mechanical loading and micro-damage from exercise. Unlike systemic IGF-1, MGF is thought to act locally within the muscle where it is produced. As a synthetic research peptide, it is studied for its proposed role in activating dormant satellite cells that contribute to muscle fiber repair and growth. It is cleared from circulation very quickly, which shapes how it is typically administered in research settings.

- URL: https://www.lifeconverted.com/peptides/mgf
- Also known as: IGF-1Ec, Mechano Growth Factor
- Primary category: Muscle & Performance
- Effectiveness rank: #19 in Healing & Recovery; #4 in Muscle & Performance
- Evidence level: Emerging research
- Route: Intramuscular (Commonly injected directly into the trained muscle shortly after exercise due to its extremely short half-life.)
- Dose range: 200-600 mcg
- Dose tiers: low 200 mcg; moderate 400 mcg; high 600 mcg
- Half-life: Estimated at a few minutes in unmodified form
- Timing: After a workout
- Cycle: 3-4 weeks on, 4-6 weeks off (Given its acute, localized action, use is typically framed around specific training blocks rather than continuous administration.)
- Storage: Store lyophilized powder frozen; reconstitute with bacteriostatic water immediately before use and keep refrigerated, using within days given its instability.

## Mechanism of action

MGF is proposed to bind IGF-1 receptors on satellite cells, triggering their activation, proliferation, and eventual fusion with existing muscle fibers to support repair and hypertrophy after mechanical stress. Because the native peptide is degraded within minutes, its physiological role is understood to be highly localized and transient, acting near the site of muscle damage rather than systemically.

## Reported benefits

- Proposed activation of satellite cells following mechanical muscle damage
- Suggested support for localized post-exercise muscle repair
- Interest as a targeted, acute-use recovery agent

## Reported side effects

- Very short half-life limits the window for any effect
- Injection site discomfort with intramuscular administration
- Unestablished long-term human safety profile
- Limited human trial data specific to synthetic MGF administration

## Common protocols

- Intramuscular injection into the trained muscle immediately post-workout

## Stacking notes

Often discussed alongside PEG-MGF, with unmodified MGF used acutely post-workout and the pegylated form used for more sustained exposure; no controlled human data support a specific combined protocol.

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