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№ 054

PEG-MGF

PEGylated Mechano Growth Factor. Polyethylene glycol attachment extends MGF's half-life from minutes to hours, allowing systemic muscle effects rather than purely local.

GH-axis
Evidence: Limited

PEG-MGF: PEGylated Mechano Growth Factor. Polyethylene glycol attachment extends MGF's half-life from minutes to hours, allowing systemic muscle effects rather than purely local. PEG-MGF is the long-acting version of MGF, adding polyethylene glycol extends half-life from minutes to hours.

FDA ⓘ
Not approved
WADA
Banned
Typical dose
200-400 mcg sub-q
Half-life ⓘ
~3-6 hours
Route ⓘ
Subcutaneous
Schedule
Post-workout, 1-2x weekly
In plain English

PEG-MGF is the long-acting version of MGF, adding polyethylene glycol extends half-life from minutes to hours. Used systemically (rather than site-specifically like plain MGF) for muscle anabolism. Once or twice weekly post-workout.

Status & legalityWhat do these mean? →
Natty? ⓘ
Not natty

PEGylated IGF-1 derivative. Universally banned in tested sport.

FDA ⓘ
Not approved

Not FDA approved as a drug.

Compounding ⓘ
Category 2

FDA flagged as significant safety risk; restricted from compounding pharmacies.

WADA ⓘ
Banned (S2)
Prescribed ⓘ

Not prescribed in conventional medicine.

Who it's for

  • →Lifters wanting systemic MGF effect rather than site-specific
  • →Post-injury recovery stacks
  • →Users running short anabolism windows

What to expect

  1. Week 1

    Subjective recovery improvements within days.

  2. Week 4

    Body-comp shifts in users training hard with adequate protein.

  3. Week 8

    Cycle endpoint approaching. Receptor desensitization starting.

Looking at PEG-MGF? Your next 3 steps

  1. 1Work out your exact dose

    Vial size + BAC water turns into the exact units to draw for PEG-MGF.

    Open calculator →
  2. 2See what to stack & monitor

    The companion supplements and the bloodwork worth tracking on this kind of protocol.

    Bloodwork guide →
  3. 3Save it & ask the Coach

    A free account saves your stack; membership adds the stack-aware AI Coach.

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How it works (mechanism)

PEGylated MGF, polyethylene glycol attached to extend half-life from minutes to hours. Allows systemic muscle effects rather than purely local at the injection site.

Dosing protocol

Members only

Stacks well with

Members only

Side effects

01Hypoglycemia at higher doses
02Localized growth at injection site
03Headache
04Theoretical: cardiac and other tissue growth at chronic high dose

When NOT to use

  • ⚠Active malignancy
  • ⚠Diabetic retinopathy
  • ⚠Pregnancy / nursing

Bloodwork to monitor

  • • IGF-1 baseline + at week 4
  • • Fasting glucose every 2 weeks

Common mistakes

  • • Treating it as MGF-equivalent (different kinetics)
  • • Daily dosing (the long half-life means weekly is sufficient)
  • • Long cycles without safety data

Drug & supplement interactions

  • ⚠Insulin: hypoglycemia risk at higher doses
  • ⚠Combine with adequate protein intake
Free, no account needed

New to PEG-MGF? Grab the starter checklist.

Drop your email and we'll send the one-page first-cycle starter checklist, plus a heads-up if PEG-MGF changes legal status. No account needed.

No spam. No selling your email. Just the checklist and the occasional reclassification alert.

AI Coach, live sample
Members only
is 250mcg of bpc enough for a knee injury?
For a knee, 250 mcg sub-q daily is the standard working dose and a solid place to start. The trick with BPC is consistency, give it weeks, not days. Inject close to the joint, run it 4-6 weeks, and don't drop below 200 mcg, it tends to stop cracking the threshold reliably down there. If it hasn't moved at all by week 3, that's when adding TB-500 earns its place.
how much bac water for a 10mg reta vial?
3 mL is the standard play for a 10 mg reta vial. That's 3,333 mcg/mL, clean unit math across the titration: 2 mg = 60 units, 4 mg = 120 units, 6 mg = 180 units on a 100-unit insulin syringe. Run 2 mL instead if you want fewer, more concentrated shots (5,000 mcg/mL, so 2 mg = 40 units). Since most people titrate up over ~12 weeks, 3 mL keeps the numbers cleanest.
what should i track on bloodwork for tirzepatide?
Lipid panel, ALT/AST (liver enzymes), and an A1C, baseline before you start then every 3 months. If you've got metabolic-syndrome history, add fasting glucose and insulin so you can actually watch insulin sensitivity improve. You don't need a big hormone panel for a GLP-1.

Ask the Coach anything about PEG-MGF or your own stack. This is it working.

Trained only on Pepdex content. Does the dose math, flags interactions, knows your stack. Won't push vendors, won't pretend to be a doctor.

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Frequently asked

What is PEG-MGF?+
PEG-MGF is the long-acting version of MGF, adding polyethylene glycol extends half-life from minutes to hours. Used systemically (rather than site-specifically like plain MGF) for muscle anabolism. Once or twice weekly post-workout.
Is PEG-MGF FDA approved?+
Not FDA approved as a drug.
Is PEG-MGF legal?+
PEG-MGF is not FDA-approved. It is sold by compounding pharmacies (with a prescription) and as "research only" by peptide vendors. Possession is generally not criminalized but distribution without authorization may be. Verify local laws.
Is PEG-MGF banned by WADA?+
PEG-MGF is on the WADA prohibited list under Banned (S2).
Are you still natty after taking PEG-MGF?+
No. PEGylated IGF-1 derivative. Universally banned in tested sport.
Do doctors prescribe PEG-MGF?+
Not prescribed in conventional medicine.
What's the typical dose of PEG-MGF?+
200-400 mcg sub-q, post-workout, 1-2x weekly.
What are the side effects of PEG-MGF?+
Common side effects include: Hypoglycemia at higher doses; Localized growth at injection site; Headache; Theoretical: cardiac and other tissue growth at chronic high dose. Less common effects and full safety details are on the entry page.
How long until PEG-MGF starts working?+
Subjective recovery improvements within days.
What can you stack with PEG-MGF?+
Common pairings: IGF-1 LR3 cautiously; Standalone preferred. Full stacking protocol and timing on the entry page.
Where do people get PEG-MGF?+
PEG-MGF is most commonly sold by research-only peptide vendors and by compounding pharmacies (the latter requires a prescription). Pepdex is not a vendor, see /coa for how to verify a Certificate of Analysis before buying from any source, and /guides/scam-vendor-spotting for vendor red flags.

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