PEG-MGF Reconstitution Calculator
Enter the amount you want to measure. The vial buttons will highlight which vial strengths create cleaner syringe-unit measurements.
⚠ Use acetic acid — not bacteriostatic water
PEG-MGF is insoluble or unstable in standard BAC water. Manufacturer protocols require reconstitution in dilute acetic acid (0.1%) — or, for IGF-1 variants, 50 mM acetic acid. Volumes shown below refer to acetic acid, not water.
What amount do you need?
Type the target amount, then choose mg or mcg. Example: 2mg or 500mcg.
Syringe size:
Possible vial strengths:
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Good Match
Usable
Harder to Measure
Example PEG-MGF Titration Schedule
| Protocol Item | Guidance |
|---|---|
| Dose | 100–500 mcg per dose |
| Frequency | 2–3× per week |
| Cycle | 4–8 weeks on, followed by a break equal to or longer than the usage duration (to allow a “reset” and minimize potential desensitization) |
| Common Timing Notes | Often used on rest days (the source notes muscle stem cell stimulation may decrease). Some theorize targeted muscle injection may increase localized effects. |
Possible vial strengths:
What Is It?
PEG-MGF
Pegylated mechano growth factor variant.
Acetic Acid (0.1%)
A dilute solution of acetic acid (typically 0.1% for most peptides, or 50 mM for IGF-1 variants) used to reconstitute peptides that are insoluble or unstable in standard bacteriostatic water. PEG-MGF requires an acidic carrier to dissolve fully and remain stable — plain BAC water will not work and may damage the peptide.
How To Mix PEG-MGF
1
CleanUse alcohol swabs to clean the tops of both vials.
2
Draw Acetic AcidDraw the selected amount of 0.1% acetic acid.
3
Inject SlowlyAdd the liquid slowly down the side of the vial.
4
Swirl GentlyDo not shake. Swirl gently until dissolved.
5
Store ProperlyStore as directed and protect from heat and light.
Best Practices & Common Mistakes
Best Practices
- Use sterile technique.
- Protect from light and heat.
- Store refrigerated when appropriate.
- Use clean syringe-unit math before measuring.
Common Mistakes
- Confusing milligrams with milliliters.
- Choosing an option with awkward decimal units.
- Using too little liquid for very small measurements.
- Shaking the vial aggressively.
PEG-MGF Storage & Handling
Lyophilized Powder: −20°C (−4°F) for long-term storage (up to 24 months). Refrigeration 2–8°C (36–46°F) for short-term use (up to ~3 months). Original sealed vial in the freezer is safest.
Reconstituted Solution: 2–8°C (36–46°F), use within ~7–14 days. Keep sealed, avoid light, and do not repeat freeze-thaw cycles.
Reconstituted Solution: 2–8°C (36–46°F), use within ~7–14 days. Keep sealed, avoid light, and do not repeat freeze-thaw cycles.
Frequently Asked Questions
PEG-MGF is the pegylated form of Mechano Growth Factor — the 24-amino-acid C-terminal E-peptide of the IGF-1Ec splice variant, with polyethylene-glycol (PEG) chains attached. Like native MGF, it's studied for activating muscle satellite (stem) cells, the early trigger of muscle repair; the PEG is simply what makes it last long enough to be practical. In short, it's the usable, longer-acting version of MGF — see the native MGF page for the unmodified peptide.
In research references PEG-MGF is dosed in micrograms — commonly around 200–400 mcg subcutaneously. Because the PEG chain greatly extends its duration, it doesn't need the immediate, into-the-muscle, every-session timing of native MGF; it's often used after training and on a less frequent schedule. These are research-reference figures, not an approved protocol, and the right approach is a clinical decision.
Add bacteriostatic water to the dry vial slowly and swirl — don't shake. For example, a 2 mg vial + 1 mL of water gives 2 mg/mL (2,000 mcg/mL); a 300 mcg dose is then 0.15 mL, which is 15 units on a U-100 insulin syringe. Use the calculator above to match your real vial size (2 mg is common) and target dose. Doses are in micrograms, so draw carefully — small volume errors are a large share of the dose.
Versus native MGF, the only change is the PEG chain, which stretches a half-life of about 5–7 minutes up to hours — long enough to inject subcutaneously and circulate, rather than having to go intramuscularly into the worked muscle. Versus IGF-1 LR3, the difference is the job: PEG-MGF's E-peptide mainly activates satellite cells to multiply (the early repair phase) through a pathway separate from the classic IGF-1 receptor, whereas IGF-1 LR3 acts on the IGF-1 receptor to drive growth and differentiation. They're different tools, and how anyone might pair them is a clinical decision, not something a calculator should merge.
PEG-MGF's bodybuilding reputation runs ahead of the evidence: pegylation fixed MGF's short-half-life problem, but the muscle-repair effects still come from cell and animal studies, with no human clinical trials of PEG-MGF. Reported effects are mostly local injection reactions, and because it sits on the IGF-1 pathway the general IGF-1 cautions apply — including avoiding it with active cancer. It's not FDA-approved, is sold for research only, and is banned by WADA under the S2 growth-factor category. Store the dry vial refrigerated and out of light; once reconstituted, keep it cold and use within a few weeks.
Practical takeaway: If your real goal is weight or metabolic health, the most useful next step is discussing approved treatment options with a clinician rather than relying on an unapproved compound.
Important: This tool is for informational and research-reference purposes only. Not intended for human or veterinary use.