PEG-MGF
What it’s used for
PEG-MGF is a PEG-modified version of mechano growth factor (MGF), a peptide related to IGF-1. People use it for muscle growth, recovery from training or injury, and tissue repair. There's no human data: support comes from cell and animal work on other forms of MGF, and a two-lab study found MGF didn't make muscle cells multiply.
- Muscle growth & recovery Community reports Used to build muscle and speed recovery after training or injury.
- Tendon, bone & cartilage Lab & animal research Other forms of MGF have been explored in animals for tendon, bone and cartilage repair.
- Nerve-cell protection Lab & animal research MGF has been studied in lab models for protecting nerve cells from oxidative injury.
What to expect
- Weeks 1–2
Less soreness
- Weeks 2–4
Better recovery
- Weeks 4–8
Tissue repair
Side effects & safety
Side effects
No side effects documented yet.
Stop and get help if
- Lumps, or swelling from fluid retention (edema)
- Severe injection-site reactions
- Headache or vision changes
- Signs of low blood sugar
- Signs of infection
Which symptoms mean call 911 or see a doctor
What regulators say
- The FDA has flagged immune-reaction and impurity concerns.
Why most peptides aren’t FDA-approved What’s really in “research use only” vials
Avoid or check first if
- History of cancer or abnormal growths
- Pregnant or breastfeeding — safety is unknown
- Taking insulin — there are blood-sugar concerns
In sport
Banned at all times. Mechano growth factors are named in S2.3, and PEG-MGF is a modified MGF. USADA lists MGF as “prohibited at all times.”
Which peptides are banned in sport
How much people take
- General recovery protocol 2–3× weekly · under the skin or into muscle 200 mcg
- Targeted muscle recovery Post-workout, 2–3× weekly · into muscle (bilateral, near target muscle) 200–400 mcg
- Injury recovery protocol 2–3× weekly · into muscle near injury site 200–400 mcg
- Conservative research protocol 2× weekly · under the skin 100–200 mcg
Similar doses appear in 3 other sources
How to mix and store it
How many units do I draw?
Open the full calculator
How to mix 5 steps with 0.6% acetic acid · vial check
How to mix
- 1 Wipe both tops Wash your hands, then swab the rubber tops of the peptide vial and the diluent vial with alcohol. Let them dry.
- 2 Draw the diluent Use 0.6% acetic acid . With a new sterile syringe, draw the amount you entered in the calculator. A 1 mL syringe filled twice is 2 mL.
- 3 Run it down the wall Push the needle into the peptide vial at an angle and let the liquid trickle down the glass, not onto the powder.
- 4 Swirl, don’t shake Gently swirl or roll the vial until the liquid is completely clear. Give it a few minutes if needed.
- 5 Label the vial Write the date and what you mixed (for example 5 mg + 2 mL) on the vial.
This is general practice. If your product came with its own diluent or instructions, follow those. Not sure what to buy? See the supplies checklist .
Is my vial OK?
Good signs
- White freeze-dried powder
- Clear after mixing
Can be normal
- Minor clumping acceptable
Don’t use if
- Collapsed or discolored
- Cloudy or particles
Injecting under the skin Where, rotating sites, which syringe
- Where: belly (at least 2 in / 5 cm from the navel), front of the thigh, or back of the upper arm; some people inject close to the injury.
- Rotate sites each time and skip bruised, scarred or sore skin.
- Syringe: most people use a U-100 insulin syringe with a short, thin needle (29–31 gauge, 8 mm or shorter).
- How: wipe with alcohol and let it dry, pinch the skin, go in at 45–90°, push slowly. Use each syringe once.
General practice for under-the-skin injections, not specific to PEG-MGF.
The full guide: how to inject safely
Storage
Fridge · 3–4 weeks Reported shelf life, not lab-tested. Mixed vial at 2–8°C (35.6–46.4°F) away from light, use within 3–4 weeks. Dry powder keeps at room temp
Combining it with others
AI assessment Based on how each compound works, not on studies of the combination. How we assess
Use caution 2
Can be combined 8
TRT CJC-1295 (no DAC) CJC-1295 with DAC Sermorelin Tesamorelin Ipamorelin CJC-1295 / Ipamorelin BPC-157
What the research says
Untested in people
- No human study defines a safe dose or how the body clears PEG-MGF.
- Findings for other forms of MGF don't prove the PEG version works the same way.
- Flagged risks include using up the body's cell reserves; responses may also vary with age.
- Long-term safety is unknown, and so is whether effects last after a cycle ends.
- The research doesn't confirm the identity, purity or handling of products bought separately.
- Results from the studied material don't show other routes or supplier products are safe.
- Interactions haven't been studied; stack ratings aren't proof that combinations are safe.
What studies found
- A replication challenge for MGF A two-laboratory study found no proliferative effect of MGF peptide in human and mouse muscle-cell systems. This was not a human PEG-MGF trial.
A half-life hasn’t been verified for this compound.
What it’s made of
- Length
- 24 amino acids (C-terminal E-peptide)
- Molecular weight
- ~2,888 Da (MGF-24aa E-peptide)
- Formula
- Not verified
Sequence 24 · N → C
- Y
- Q
- P
- P
- S
- T
- N
- K
- N
- T
- K
- S
- Q
- R
- R
- K
- G
- S
- T
- F
- E
- E
- H
- K
Identity as reported in peptide guides; exact-product sequence and modifications have not been independently confirmed.
Sequence and formulation must be confirmed for the exact material; similarly named products are not necessarily interchangeable.
Length and weight come from a reference listing and were not independently confirmed.
Sources
Sources 18
How this page was made
How it may work: MGF-related signaling is studied in satellite-cell proliferation and repair; extrapolation to marketed PEG-MGF is uncertain.
Other names: Pegylated mechano growth factor
Preparation in studies: A product-specific preparation or sterility protocol has not been verified.
Cell/animal MGF findings are not proof of injectable PEG-MGF benefits. Interaction labels do not establish safety.
Research last checked: Oct 12, 2026 (a targeted search, not a full review).
Community doses, how long people take it, timing and storage are compiled with AI from public peptide guides, clinics and forums, cross-checked against other sources where we could, and rewritten in plain language. “Combining it with others” is an AI assessment of how the compounds work. Study notes are written from each paper’s abstract where one exists. How we source
Original source guide