PEG-MGF
Also known as: PEGylated Mechano Growth Factor · Pegylated MGF · PEG-IGF-1Ec
Native MGF is produced locally in muscle tissue after mechanical stress (exercise-induced damage) via alternative splicing of the IGF-1 gene. MGF activates muscle satellite cells (muscle stem cells) through a unique receptor binding domain in the C-terminal peptide (distinct from...
What It Is
Native MGF is produced locally in muscle tissue after mechanical stress (exercise-induced damage) via alternative splicing of the IGF-1 gene. MGF activates muscle satellite cells (muscle stem cells) through a unique receptor binding domain in the C-terminal peptide (distinct from the IGF-1R). This drives satellite cell proliferation, differentiation, and fusion into existing muscle fibers for repair and hypertrophy. The PEGylation of the C-terminal MGF peptide (at lysine residue) dramatically extends the half-life from ~5 minutes (native MGF) to ~24 hours, allowing once-daily dosing. PEG-MGF specifically promotes local muscle repair and new fiber formation at the site of mechanical damage.
Supplies Needed
Reconstitution solvent
Intramuscular or subcutaneous injection
Sterilization
Storage
Store at -20C for up to 2 years. Sensitive to temperature fluctuations.
Refrigerate at 2-8C; use within 30 days.
This information is provided for educational and research purposes only. Not approved for human consumption by the FDA or any regulatory body. Always consult a qualified medical professional.
Dosing Protocols
Timing: Post-workout injected near the trained muscle group. Inject near the muscle group trained that session for localized satellite cell activation
↓ Apply these values to the reconstitution calculatorTiming: Post-workout; inject near muscles trained that day. Most effective when injected near damaged muscle tissue; stack with IGF-1 LR3 for comprehensive anabolic protocol
↓ Apply these values to the reconstitution calculatorTiming: Post-workout at multiple sites near major muscle groups trained. High-dose for maximum satellite cell activation; divide dose between multiple injection sites near trained muscle groups
↓ Apply these values to the reconstitution calculatorWeekly Timeline
| Week | Expected Effects |
|---|---|
| Week 1 | Increased satellite cell activity in trained muscles; improved post-workout muscle fullness |
| Week 2 | Enhanced recovery; improved strength in trained muscle groups |
| Week 4 | Significant lean mass gains; faster recovery between sessions; potential new fiber formation |
| Week 8 | After cycle + recovery: retained lean mass gains; receptor sensitivity restored |
Reconstitution Calculator
1 unit on U-100 syringe = 0.01 mL · Always label your vial after reconstitution
Injection Technique & Reconstitution
- Remove flip-top cap from the vial
- Swab rubber stopper with alcohol swab
- Draw 2 mL bacteriostatic water into syringe
- Inject slowly down the vial wall
- Gently swirl until dissolved - do not shake
- Label with reconstitution date; refrigerate at 2-8C
Use our free calculate your PEG-MGF dose to get the exact syringe units for your vial size and dose.
Mechanism of Action
Native MGF is produced locally in muscle tissue after mechanical stress (exercise-induced damage) via alternative splicing of the IGF-1 gene. MGF activates muscle satellite cells (muscle stem cells) through a unique receptor binding domain in the C-terminal peptide (distinct from the IGF-1R). This drives satellite cell proliferation, differentiation, and fusion into existing muscle fibers for repair and hypertrophy. The PEGylation of the C-terminal MGF peptide (at lysine residue) dramatically extends the half-life from ~5 minutes (native MGF) to ~24 hours, allowing once-daily dosing. PEG-MGF specifically promotes local muscle repair and new fiber formation at the site of mechanical damage.
Key Research Papers
Demonstrated that MGF C-terminal peptide specifically activates satellite cells in damaged muscle, promoting repair and hypertrophy via a mechanism distinct from IGF-1R signaling.
View on PubMed →Stacks Well With
The classic muscle hypertrophy stack. PEG-MGF activates satellite cells (new fiber potential) while IGF-1 LR3 drives global mTOR/protein synthesis. Inject PEG-MGF post-workout and IGF-1 LR3 systemically.
Muscle repair and healing stack - PEG-MGF activates satellite cells for muscle fiber repair while BPC-157 promotes tendon/ligament healing and reduces inflammation.
Frequently Asked Questions
PEG-MGF activates muscle satellite cells - the stem cells responsible for muscle fiber repair and new fiber formation. It is used post-workout near trained muscles to maximize satellite cell recruitment for hypertrophy and recovery.
MGF is naturally produced locally in mechanically stressed muscle tissue. Injecting PEG-MGF near the muscles that were just trained mimics this local signal and maximizes satellite cell activation at the site of damage.
Yes - this is the classic stack. IGF-1 LR3 activates global mTOR-driven protein synthesis while PEG-MGF specifically recruits satellite cells for new fiber formation. They target different but synergistic aspects of muscle growth.
Legal Status by Region
This information is provided for educational and research purposes only. Not approved for human consumption by the FDA or any regulatory body. Always consult a qualified medical professional.