PEG-MGF
Also known as: Pegylated MGF, MGF-24aa-E peptide
Pegylated Mechano Growth Factor | IGF-1 Splice Variant
Overview
Modified IGF-1 variant with PEG attachment extending half-life from minutes to hours. Activates muscle satellite cells following mechanical stress or injury.
Key benefits
- Extended half-life through PEGylation
- Satellite cell activation for muscle repair
- Recovery support following mechanical stress
- Potential neuroprotection against oxidative stress
Mechanism of action
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.
Molecular data
- Type
- IGF-1Ec splice variant C-terminal peptide
- Half-life
- 48-72 hours (via PEGylation)
Sequence
YQPPSTNKNTKSQRRKGSTFEEHK
Indications
What the research community uses this compound for, with self-reported effectiveness.
Muscle Repair
Satellite Cell Activation
Most effectivePrimary mechanism activating dormant muscle satellite cells which fuse to damaged fibers.
Delayed Senescence
EffectiveIncreases proliferative lifespan in younger muscle progenitor cells.
Enhanced Fusion Potential
EffectiveIncreases activated satellite cell fusion capacity supporting repair and hypertrophy.
Tissue Regeneration
Tendon Healing
EffectiveAnimal studies suggest improved Achilles tendon injury outcomes.
Bone Regeneration
ModerateRabbit models demonstrated faster healing via osteoblast regulation.
Cartilage Repair
ModerateResearch indicates potential for articular cartilage injury models.
Recovery
Exercise Recovery
ModerateNaturally upregulated after mechanical stress; supplementation may enhance processes.
Injury Recovery
EffectiveLocalized injection near injury sites supports targeted tissue repair.
Dosing protocols
Common protocols by delivery method. Adjust the curve below to model accumulation in your own cycle.
Injectable
Subcutaneous or intramuscular administration; post-workout timing aligns with natural MGF upregulation.
| Protocol | Dose | Frequency | Route / duration |
|---|---|---|---|
| General Recovery | 200mcg | 2-3x weekly | SubQ or IM |
| Targeted Muscle Recovery | 200-400mcg | Post-workout, 2-3x weekly | IM bilateral near target muscle |
| Injury Recovery | 200-400mcg | 2-3x weekly | IM near injury site |
| Conservative Protocol | 100-200mcg | 2x weekly | SubQ |
Preparation
You will need
- PEG-MGF lyophilized powder (typically 2mg vial)
- Bacteriostatic water
- Insulin syringes (29-31 gauge)
- Alcohol swabs
Steps
- Allow vial to reach room temperature
- Clean rubber stopper with alcohol swab
- Draw appropriate bacteriostatic water amount
- Inject slowly along vial wall, not directly onto powder
- Gently swirl to dissolve; never shake
- Allow 2-5 minutes for full dissolution
- Store refrigerated at 2-8°C
- Protect from light
Work out the water volume and syringe units in the reconstitution calculator →
Interactions
Pairwise interactions with other compounds you might be cycling — the same data behind the cycle builder's safety check.
IGF-1 LR3
MonitorBoth target IGF-1 pathways; combining risks receptor overstimulation. Reduce doses significantly if combined.
Human Growth Hormone
MonitorHGH increases endogenous IGF-1/MGF. Combined use amplifies effects but monitor for excessive water retention and joint pain.
Insulin
MonitorBoth affect glucose metabolism. Monitor blood sugar carefully if combined.
BPC-157
SynergisticComplementary mechanisms. BPC-157 promotes angiogenesis; PEG-MGF activates satellite cells. Popular recovery stack.
TB-500
SynergisticTB-500 reduces inflammation and promotes cell migration; PEG-MGF activates muscle stem cells.
Thymosin Beta-4
SynergisticDifferent regenerative pathways may enhance tissue repair through multiple mechanisms.
Timeline
Typical week-by-week effects reported in clinical and observational data.
- Week 1-2
Reduced muscle soreness post-workout; subtle recovery improvements
- Week 2-4
Enhanced recovery between training; potential injury-related discomfort reduction
- Week 4-8
Optimal muscle repair effects; improved training capacity from better recovery
- Post-cycle
Benefits persist several weeks as tissue repair continues
Safety
Reported adverse effects, contraindications, and what to monitor on cycle.
Common side effects
- Injection site soreness
- Mild fatigue
Stop signs — stop and seek advice
- 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
Contraindications
- Any history of cancer or neoplastic disease
- Pregnancy or breastfeeding
- Uncontrolled diabetes or severe hyperglycemia
Monitoring
- Not FDA-approved; limited human safety data available
- Long-term safety profile unknown
- Age-dependent response: benefits shown in young donors but not elderly
- Blood glucose monitoring recommended for diabetic individuals
- Prohibited in competitive sports (WADA banned)
Quality checks
What a legitimate product looks like, what should give pause, and what should make you stop.
Good signs
- 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%)
Warning signs
- Minor clumping that dissolves with gentle swirling is normal
Stop signs — don't use
- Collapsed or discolored powder suggests heat degradation
- Persistent cloudiness or visible particles indicate contamination
References
Primary literature and clinical-trial data informing this entry.
MGF-E Peptide Human Muscle Cell Study
2011
Landmark study demonstrating MGF significantly increased satellite cell proliferation at 3ng/ml (P<0.001) with age-dependent effects.
MGF Inflammatory Response Study
2018
MGF overexpression modulated inflammatory cytokines and enhanced macrophage resolution during skeletal muscle injury recovery.
Mechano-Growth Factor Minireview
2010
Overview of MGF as IGF-I gene product involved in tissue repair, highlighting upregulation following exercise and injury.
Last updated . How this page was sourced is described in the methodology.