Healing & Recovery

PEG-MGF

PEGylated Mechano Growth Factor

PEG-MGF is a PEGylated analog of the IGF-1Ec (MGF) splice. Native MGF is minutes-class in plasma; PEGylation is meant to stretch that. Research-chem “3–5 day half-life” is analog chemistry, not a published human PK package for the vial on a forum. No completed hypertrophy RCT of gray-market PEG-MGF.

Not FDA-approved - research chemical

Reviewed by CalcMyPeptide Editorial Team

·Last updated: August 2026·Evidence: Low·2 peer-reviewed citations

Typical research dose

200-400 mcg/day

Frequency

2-3× weekly

Half-life

Designed to outlast native MGF; human SKU t½ unpublished. Do not treat 72 h as measured fact.

Common vials

2 mg / 5 mg

CAS

N/A (modified research analog)

Molecular weight

Peptide core plus PEG; COA should state both

Use-case scores

0–10 against the evidence we have, not a gym ranking. Hidden domains do not apply here.

Muscle / recomp3/10
Splice biology is real. PEG-MGF as sold is an uncharacterized analog. Community ceiling, not a hypertrophy trial.
Injury & tissue3/10
Injury-repair conversation is borrowed from native MGF models. Not a tendon RCT.

Compound card

Sequence: PEGylated IGF-1Ec / MGF analog (vendor sequences vary)
Class: PEGylated MGF analog (not native splice, not IGF-1 LR3)
Formula: PEGylated IGF-1Ec fragment (vendor)
Status: Not FDA-approved · research use

Dose it

2 mg + 2 mL BAC water → 1 mg/mL · 200 mcg ≈ 20 units (U-100)

Open in calculator

How it works

MGF is the IGF-1Ec splice Goldspink described after mechanical load (Biochem Soc Trans 2002, PMID 12196225). Native peptide is minutes-class in plasma. PEG-MGF is a vendor PEGylated analog meant to last longer. “3–5 days” on this site’s catalog line is analog chemistry, not a published human PK package for the cake in a research vial.

Satellite-cell folklore is the sales pitch. There is no completed hypertrophy RCT of gray-market PEG-MGF. It is not IGF-1 LR3 (different analog, hours-class IGF1R agonist). PEG itself can be immunogenic. Mitogenic signaling is why active malignancy is a hard no.

Source: PMID: 15735070

Analog, not a Goldspink lot

The 2002 paper is native MGF biology. Your vial is PEGylated research-chem. Parent papers do not transfer automatically.

Goal context

Why PEG exists

Native MGF dies in minutes. PEG is a shield. A shield is not a potency trial and not a 5-day depot you can feel in the gym.

Not LR3

IGF-1 LR3 is a long IGF-1 analog at IGF1R. MGF folklore claims a distinct satellite-cell receptor. Do not dual-count them as one drug.

Background & History

PEG-MGF is a PEGylated analog of the IGF-1Ec (MGF) splice. Native MGF is minutes-class; PEG is meant to last longer. “3–5 day half-life” is analog chemistry, not a published human PK package for a research lot. Not IGF-1 LR3. Not a hypertrophy RCT.

Research Use Cases

✓PEGylated MGF analog identity
✓Not a proven systemic muscle drug

Dosing

Phase	Dose	Frequency	Notes
Community research-chem (unlabeled)	200–400 mcg	2–3× weekly SC	Copied range. Not a label. Cycle folklore is not receptor science.

Administration

Route / form

Subcutaneous (systemic by design). Local injection is the native-MGF story, not this SKU’s reason to exist.

Timing

Training days is habit, not PK.

Empty stomach?

No - Food timing is not critical.

Timeline

Unknown in humans

No honest hypertrophy calendar. Satellite-cell language is borrowed from native splice work.

Who it is for

Want the PEGylated analog identity

Low

This page exists so PEG-MGF does not 404 into native MGF.

Want a proven anabolic

Low

Wrong tool.

Reconstitution

Vial	Water	Concentration	Example dose
2 mg	2.0 mL BAC	1 mg/mL	200 mcg = 0.20 mL = 20 units on a U-100 syringe

Change vial size or water volume? Open the reconstitution calculator.

Safety & Considerations

Research analog. Mitogenic / IGF-family caution in active cancer. PEG antibodies possible with repeated exposure. Hypoglycemia is more of an LR3 story but dose-stupid overlap is not impossible. Not a daily forever peptide by folklore either.

Regulatory & Legal Status

FDA Status (US)

Research Only

WADA Status (2026)

Not Listed

Not currently on the WADA 2026 Prohibited List. Policies may change - verify before competition.

Classification

Research Chemical

US Compounding: Not eligible / not available

⚠️ This information is for educational purposes only and may not reflect the most current regulatory updates. Always verify with official FDA, WADA, and jurisdiction-specific sources before use.

Limits of current evidence

PMID 12196225 is native MGF/splice biology, not a PEG-MGF human trial.
No published human PK for typical research-chem PEG-MGF lots.
PEG immunogenicity is a class issue, not a theoretical footnote only.
WADA growth-factor / GHRF territory. Not “recovery legal.”

Verdict

PEG-MGF is a stability hack on a splice variant, not a proven systemic muscle drug. Math the vial. Do not print a 72-hour human half-life. Do not confuse it with IGF-1 LR3 or native MGF.

Interactions & Contraindications

PEG immunogenicity with repeated exposure. IGF-family mitogenic caution in active cancer. Do not treat 72 h as measured fact.

Synergies & Common Stacks

+ MGF →

Native vs PEGylated. Confirm the COA before you stack them as a “cascade.”

Appears in goal guides

Goal guides are maps, not clinic protocols. A mention here is not a treatment plan.

Hypertrophic Muscle & Recomposition

GHRH/GHRP stacks versus somatropin. Secretagogues pulse endogenous GH; they are not a hypertrophy NDA.

View Protocol →

Frequently Asked Questions

MGF vs PEG-MGF?▼

Native MGF is minutes-class and the local-injection folklore lives there. PEG-MGF is a longer analog. Neither has a consumer RCT.

Is the half-life 3–5 days?▼

That is the PEGylation sales number. We will not print it as measured human PK for a research lot.

How do I reconstitute a 2 mg vial?▼

Add 2.0 mL BAC for 1 mg/mL. 200 mcg is 0.20 mL (20 units).

Is this IGF-1 LR3?▼

No. Different analog, different receptor story, different hypoglycemia profile.

Post-workout only?▼

Habit. Native MGF is load-timed. PEG is sold as systemic. Not a head-to-head trial.

Cancer risk?▼

Growth-factor class. Active malignancy is a stay-out.

FDA-approved?▼

No.

WADA?▼

Growth-factor related. Assume prohibited until you read the current list with a specialist.

References

Goldspink G “Mechano growth factor: an important skeletal muscle growth factor.” Biochem Soc Trans (2002). PMID: 12196225
Hill M, Goldspink G. “Mechano growth factor expression in skeletal muscle following mechanical overload.” Growth Factors (2003). PMID: 14626773

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