PEG-MGF
Pegylated Mechano Growth Factor · IGF-1 Splice Variant
Modified IGF-1 variant with PEG attachment extending half-life from minutes to hours. Activates muscle satellite cells following mechanical stress or injury.
Overview
Modified IGF-1 variant with PEG attachment extending half-life from minutes to hours. Activates muscle satellite cells following mechanical stress or injury.
Activates muscle satellite stem cells via receptor binding, stimulating MAPK/ERK signaling. Enhances protein synthesis and promotes muscle fiber repair. E-peptide domain exhibits distinct activity from mature IGF-1.
Research indications
What the compound has been studied for, grouped by body system. Effect size is the reported magnitude where it was measured — not a recommendation.
Primary mechanism activating dormant muscle satellite cells which fuse to damaged fibers.
Increases proliferative lifespan in younger muscle progenitor cells.
Increases activated satellite cell fusion capacity supporting repair and hypertrophy.
Animal studies suggest improved Achilles tendon injury outcomes.
Rabbit models demonstrated faster healing via osteoblast regulation.
Research indicates potential for articular cartilage injury models.
Naturally upregulated after mechanical stress; supplementation may enhance processes.
Localized injection near injury sites supports targeted tissue repair.
A large effect in a weak study and a small effect in a strong one are different things. Effect size is never evidence of use in people.
- Class
- IGF-1Ec splice variant C-terminal peptide
- Chain length
- 24 residues
- Molecular weight
- 2888 Da
- Half-life
- ~60 h
- Typical dose
- 200-400mcg per injection
- Frequency
- 2-3x weekly, ideally post-workout
- Cycle length
- 4-8 weeks
- Storage
- Refrigerate at 2-8°C; protect from light
Molecular data
- Type
- IGF-1Ec splice variant C-terminal peptide
- Molecular weight
- 2888 Da
- Chain length
- 24 residues
- Half-life
- 3600 min
Dosing reference
Doses reported in the literature and by suppliers. These are a record of what has been used in research — reference, never instruction.
| Context | Route | Amount | Frequency |
|---|---|---|---|
| General Recovery | SubQ or IM | 200mcg | 2-3x weekly |
| Targeted Muscle Recovery | IM bilateral near target muscle | 200-400mcg | Post-workout, 2-3x weekly |
| Injury Recovery | IM near injury site | 200-400mcg | 2-3x weekly |
| Conservative Protocol | SubQ | 100-200mcg | 2x weekly |
Interactions
Both target IGF-1 pathways; combining risks receptor overstimulation. Reduce doses significantly if combined.
HGH increases endogenous IGF-1/MGF. Combined use amplifies effects but monitor for excessive water retention and joint pain.
Complementary mechanisms. BPC-157 promotes angiogenesis; PEG-MGF activates satellite cells. Popular recovery stack.
TB-500 reduces inflammation and promotes cell migration; PEG-MGF activates muscle stem cells.
Both affect glucose metabolism. Monitor blood sugar carefully if combined.
Different regenerative pathways may enhance tissue repair through multiple mechanisms.
Quality checklist
- ✓White or off-white fluffy cake appearance indicates proper freeze-drying
- ✓Crystal clear solution after reconstitution with no particles
- ✓Certificate of Analysis with HPLC purity testing (>98%)
- !Minor clumping that dissolves with gentle swirling is normal
- ×Collapsed or discolored powder suggests heat degradation
- ×Persistent cloudiness or visible particles indicate contamination
What to expect
Safety
- Injection site soreness
- Mild fatigue
- Any unusual growths, lumps, or rapid tissue changes
- Severe injection site reactions beyond normal soreness
- Persistent headaches or vision changes
- Signs of hypoglycemia
- Unexpected swelling or edema
- Any history of cancer or neoplastic disease
- Pregnancy or breastfeeding
- Uncontrolled diabetes or severe hyperglycemia
FAQ
What makes PEG-MGF better than regular MGF for muscle recovery?
PEGylation extends the half-life from minutes to 48-72 hours, meaning you don't need to inject as frequently and the peptide stays active longer in your system. Regular MGF has a very short half-life, limiting recovery window. PEG-MGF's extended duration allows for deeper satellite cell activation and sustained muscle repair.
Should I inject PEG-MGF into the muscle I just trained?
Yes, localized injection near or into the damaged muscle is optimal. The file specifically lists 'IM bilateral near target muscle' for targeted recovery. Post-workout timing (within 1-2 hours) aligns with when your body naturally upregulates MGF, making that the ideal window for injection.
Can I stack PEG-MGF with testosterone for better muscle growth?
There's no direct contraindication, but be cautious. PEG-MGF activates satellite cells (muscle stem cells) while testosterone increases protein synthesis and hormonal signals. The combination might work synergistically, but monitor for excessive water retention and joint pain, which can occur with combined growth-promoting agents.
Does PEG-MGF work for non-athletes wanting muscle maintenance?
Possibly, but PEG-MGF is most effective when there's mechanical stress or injury to trigger satellite cell activation. Without training stimulus or injury, it won't dramatically build muscle. It's better for accelerating recovery after workouts or helping with injury rehabilitation rather than standalone muscle building.