Side-by-side comparison of mechanisms, dosing, interactions, and stacking potential.
| MGF (Mechano Growth Factor) | PEG-MGF (Pegylated Mechano Growth Factor) | |
|---|---|---|
| Category | Growth Factors | Growth Factors |
| Standard Dose | Research indicates 100-200 mcg per injection site, administered bilaterally into target muscles immediately post-workout. | Research indicates 200-500 mcg administered 2-3 times per week via subcutaneous or intramuscular injection. |
| Timing | Immediately post-workout (within 5-10 minutes) for optimal satellite cell activation. Must be injected directly into the trained muscle. | On non-training days or several hours post-workout (to avoid competing with natural MGF pulse). Unlike native MGF, timing is more flexible due to extended half-life. |
| Cycle Duration | 4-6 week cycles. | 4-8 week cycles. |
| Evidence Level | animal_plus_anecdotal | animal_plus_anecdotal |
MGF is the E domain peptide of the IGF-1Ec splice variant, produced when the IGF-1 gene is mechanically spliced in response to muscle damage or exercise. It activates satellite cells (muscle stem cells), promoting their proliferation and preventing premature differentiation. After exercise/injury, IGF-1 gene is first spliced toward MGF (proliferation phase) then shifts to IGF-1Ea (differentiation phase). MGF uniquely drives the initial proliferative response, expanding the pool of myogenic precursor cells before they fuse with existing muscle fibers.
Research indicates 100-200 mcg per injection site, administered bilaterally into target muscles immediately post-workout.
Immediately post-workout (within 5-10 minutes) for optimal satellite cell activation. Must be injected directly into the trained muscle.
4-6 week cycles.
PEG-MGF is the pegylated form of Mechano Growth Factor, where polyethylene glycol (PEG) molecules are covalently attached to protect against rapid enzymatic breakdown. This extends the half-life from 5-7 minutes (native MGF) to approximately 48-72 hours. Like native MGF, it activates satellite cell proliferation, promotes muscle fiber regeneration and hypertrophy, and supports tissue repair. The extended half-life allows for systemic distribution rather than purely local action, enabling subcutaneous rather than intramuscular administration.
Research indicates 200-500 mcg administered 2-3 times per week via subcutaneous or intramuscular injection.
On non-training days or several hours post-workout (to avoid competing with natural MGF pulse). Unlike native MGF, timing is more flexible due to extended half-life.
4-8 week cycles.
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