Growth
PEG-MGF
Healing
24
Amino acids
Molecular weight
Peptide
Type
PEG-MGF (Pegylated Mechano Growth Factor) is a synthetic, PEGylated analog of the IGF-1 Ec splice variant naturally produced in mechanically stressed muscle tissue. The polyethylene glycol modification extends its half-life from minutes to 48–72 hours, enabling sustained satellite cell activation and muscle fiber regeneration. It is used in research contexts focused on skeletal muscle repair, hypertrophy, and neuroprotection.
Top researched benefits
Overview of PEG-MGF
PEG-MGF binds to IGF-1 receptors and activates downstream PI3K/Akt and MAPK signaling pathways, driving satellite cell proliferation and differentiation into new myofibers. The PEG modification sterically protects the peptide from proteolytic degradation, extending systemic circulation and prolonging localized anabolic signaling at sites of mechanical damage.
muscle repair
- 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.
tissue regeneration
- Animal studies suggest improved Achilles tendon injury outcomes.
- Rabbit models demonstrated faster healing via osteoblast regulation.
- Research indicates potential for articular cartilage injury models.
recovery
- Naturally upregulated after mechanical stress; supplementation may enhance processes.
- Localized injection near injury sites supports targeted tissue repair.
Typical Dose
200–400mcg per injection
Frequency
2–3 times per week
Cycle Duration
4–6 weeks on, 2–3 weeks off
Storage
Lyophilized: store at -20°C or below, stable at room temperature for up to 3–4 weeks. Reconstituted: store at 2–8°C for up to 14 days or at -20°C for longer term; avoid repeated freeze-thaw cycles.
Chemical Makeup
Key benefits
Activates muscle satellite cells at the site of mechanical damage, accelerating regeneration of torn or stressed myofibers
Extends the anabolic signaling window from minutes (native MGF) to 48–72 hours via PEGylation, allowing twice-weekly dosing
Promotes myoblast fusion and hypertrophy through PI3K/Akt pathway activation, supporting measurable increases in muscle cross-sectional area in animal models
Demonstrated neuroprotective effects in preclinical models, including reduction of ischemia-induced neuronal apoptosis and potential stroke protection
Community interest
This peptide is still gaining traction in the community.
IGF-1 Splice Variant | Muscle Repair & Regeneration
This overview is informational and based on aggregated descriptions from studies and user reports.
Was it helpful?YesNoPEG-MGF Molecular Information
View the scientifc details of PEG-MGF.
24
Amino Acids
PEG-MGF
Tyr
Tyr
Position 1
Gln
Gln
Position 2
Pro
Pro
Position 3
Pro
Pro
Position 4
Ser
Ser
Position 5
Thr
Thr
Position 6
Asn
Asn
Position 7
Lys
Lys
Position 8
Asn
Asn
Position 9
Thr
Thr
Position 10
Lys
Lys
Position 11
Ser
Ser
Position 12
Gln
Gln
Position 13
Arg
Arg
Position 14
Arg
Arg
Position 15
Lys
Lys
Position 16
Gly
Gly
Position 17
Ser
Ser
Position 18
Thr
Thr
Position 19
Phe
Phe
Position 20
Glu
Glu
Position 21
Glu
Glu
Position 22
His
His
Position 23
Lys
Lys
Position 24
Molecular Weight
2867.2DaChain Length
24Amino AcidsType
PeptidePEG-MGF Protocols
Subcutaneous or intramuscular injection near the trained or injured muscle is the only well-documented delivery route for PEG-MGF. Post-workout injection within 30 minutes captures the natural inflammatory signaling window for optimal satellite cell recruitment and tissue repair.
| Goal | Dosage | Frequency | Route |
|---|---|---|---|
| Establish individual tolerance and assess response before escalating dose | 100 | 2 week range | SubQ near target muscle |
| Accelerate muscle fiber repair and reduce delayed-onset soreness after training | 200 | 2 week range | SubQ or IM near trained muscle |
| Stimulate satellite cell proliferation for increased muscle fiber size and density | 400 | 3 week range | IM near trained muscle |
| Promote satellite cell activity and tissue regeneration at a specific injured site | 200 | 2 week range | SubQ near injury site |
| Preserve muscle mass and satellite cell activity in the context of age-related decline | 150 | 2 week range | SubQ |
| Limit muscle atrophy and support tissue healing during immobilization after surgery | 200 | 2 week range | SubQ near surgical site |
Reconstitution Instructions
Materials needed:
Steps to reconstitute
- Allow the lyophilized PEG-MGF vial to reach room temperature before reconstitution
- Draw 2 mL of bacteriostatic water into an insulin syringe
- Inject the BAC water slowly down the inside wall of the vial — never directly onto the powder
- Do not shake the vial — gently rotate between your fingers until the powder fully dissolves into a clear solution
- Label the vial with the date of reconstitution (2 mg vial + 2 mL BAC water = 1000 mcg/mL concentration)
- Refrigerate the reconstituted vial at 36–46°F (2–8°C) and use within 3–4 weeks; never freeze reconstituted solution
- For each dose, draw the calculated volume into a fresh insulin syringe (e.g., 0.15 mL = 150 mcg at 1000 mcg/mL)
- Wipe the injection site with an alcohol swab and let it fully air dry before injecting
- For subcutaneous injection, pinch the skin near the target muscle and insert the needle at 45 degrees; for intramuscular, insert straight at 90 degrees into the trained muscle belly
- Push the plunger slowly and steadily, wait 5–10 seconds, then remove the needle and apply gentle pressure with a clean swab
PEG-MGF Cycle
The PEG-MGF Cycle section explains how long a typical cycle lasts and what to expect during each phase. Over time, your body can become less responsive with continuous use.
Taking breaks between cycles may help maintain effectiveness and support better overall results.
- 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
- Week 0-0
- Benefits persist several weeks as tissue repair continues
Dosing tools
PEG-MGF Peptide Dosage Calculator
Calculate peptide doses with our visual syringe guide.
mg
Enter the total amount of peptide in the vial in milligrams (as stated on the label).
The dose you want to inject per administration, in mcg or mg.
1,000 mcg = 1 mg
1 mL
2 mL
3 mL
5 mL
Custom
Volume of bacteriostatic water you add to reconstitute the powder. Use BAC water for preservation.
Injection Results
Based on your vial and dilution inputs.
PEG-MGF
SINGLE COMPOUNDVolume per injection
0.05
mL
Concentration
10.00
mg/mL
Doses per vial
20
doses
Total injections per vial
20 injections
How it works
Based on a 10 mg PEG-MGF vial diluted with 1 mL of bacteriostatic water, each 500 mcg injection equals 0.05 mL.
1mL / 100 units
5 units
0.050 mL
Reference Guide
Dosing Cycle
- Peptide
- PEG-MGF
- Dosing
- 200–400mcg per injection
- Dosing Frequency
- 2–3 times per week
- Cycle Duration
- 4–6 weeks on, 2–3 weeks off
- Storage
- Lyophilized: store at -20°C or below, stable at room temperature for up to 3–4 weeks. Reconstituted: store at 2–8°C for up to 14 days or at -20°C for longer term; avoid repeated freeze-thaw cycles.
Note: Triple agonist; microdose for fewer side effects
Reconstitution Tips
- Use bacteriostatic water (BAC) — contains 0.9% benzyl alcohol for preservation
- Inject water slowly — aim down the vial wall, not directly onto powder
- Never shake — gently swirl or roll the vial until dissolved
- Store properly — refrigerate at 2-8°C after reconstitution
- Use within 28 days — most reconstituted peptides remain stable for about 4 weeks
- Keep sterile — always clean vial tops with alcohol before drawing
Peptide Interactions
Research suggestions of PEG-MGF interactions with other common peptides and substances.
Healing
bpc
Longevity
BPC-157
SYNERGISTIC
Complementary mechanisms. BPC-157 promotes angiogenesis; PEG-MGF activates satellite cells. Popular recovery stack.
Growth
igf
Healing
IGF-1 LR3
MONITOR
Both target IGF-1 pathways; combining risks receptor overstimulation. Reduce doses significantly if combined.
Healing
tb5
Longevity
TB-500
SYNERGISTIC
TB-500 reduces inflammation and promotes cell migration; PEG-MGF activates muscle stem cells.
Healing
thymos
Longevity
Thymosin Beta-4
SYNERGISTIC
Different regenerative pathways may enhance tissue repair through multiple mechanisms.
Side effects
Monitor: Be careful when combining PEG-MGF with IGF-1 LR3.
Contraindications
Any history of cancer or neoplastic disease
Pregnancy or breastfeeding
Uncontrolled diabetes or severe hyperglycemia
Stop signs
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
Bad signs
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Frequently asked questions
What is a peptide dosage calculator?
A peptide dosage calculator is a free tool that converts your vial size, bacteriostatic water volume, and target dose into an exact syringe draw volume. Instead of doing the reconstitution math by hand, you enter three inputs and instantly get the concentration of your solution and how many milliliters or syringeunits to draw. This calculator works for single peptide compounds and multi-peptide blends.
How do I calculate peptide dosage from a vial?
To calculate your peptide dose, divide the total peptide content of your vial in micrograms by the volume of bacteriostatic water you added in milliliters. This gives you your solution concentration in mcg/mL. Then divide your target dose by that concentration to get your draw volume. For example, a 5mg (5,000 mcg) vial reconstituted with 2mL of BAC water gives a concentration of 2,500 mcg/mL. A 250 mcg dose would require drawing 0.1mL. This calculator automates all of those steps instantly.
How much Bacteriostatic water should I add to a peptide vial?
Most people add 2mL to 3mL of bacteriostatic water per vial, but the right amount depends on the dose you want to draw and the syringe size you are using. Adding 1mL to a 5mg vial gives you a concentration of 5,000 mcg/mL, making each dose very small in volume. Adding 2mL gives you 2,500 mcg/mL, which is easier to measure on a standard insulin syringe. A general guideline is to choose a volume that puts your typical dose somewhere between 10 and 30 units on a U-100 syringe. Use the calculator above to test different water volumes and find what works for your dose.
How are peptides different from proteins?
Both are made of amino acids, but peptides are much smaller than proteins. Because of their tiny size, peptides can act like tiny messengers in the body, sending specific signals to your cells to tell them exactly what to do.
PEG-MGFResearch References
PEG-MGF is a preclinical compound
PEG-MGF
PEG-MGF is a preclinical compound
MGF-E Peptide Human Muscle Cell Study
Landmark study demonstrating MGF significantly increased satellite cell proliferation at 3ng/ml (P<0.001) with age-dependent effects.
2011
MGF Inflammatory Response Study
MGF overexpression modulated inflammatory cytokines and enhanced macrophage resolution during skeletal muscle injury recovery.
2018
Mechano-Growth Factor Minireview
Overview of MGF as IGF-I gene product involved in tissue repair, highlighting upregulation following exercise and injury.
2010
Calculate peptide dosages
Learning how to calculate a peptide dose? Use our beginner-friendly peptide dosage, blend, and accumulation calculators. Enter vial size, reconstitution volume, and target dose to get exact draw volumes instantly. No guesswork, just clear guidance that helps prevent common mistakes.
