Mechano growth factor (MGF, PEG-MGF)
Pegylated mechano growth factor, IGF-1Ec, IGF-1Ec peptide
Forms: MGF (short-acting peptide) and PEG-MGF (pegylated form marketed as longer-acting). Pegylation changes how the peptide behaves, so findings on one may not apply to the other.
A peptide based on the tail (E-domain) of an IGF-1 variant that muscle makes after loading or injury; sold as MGF and pegylated PEG-MGF. Never tested in humans.
Legal status: Never approved; sold as a 'research peptide'. WADA names mechano growth factors as prohibited. Status varies by country.
What it gives
What people use it for and what the sources report. Strength is a general category from the literature: mild, clear or strong.
Purpose
No medical use; never approved. In sport: a 'research peptide' used for muscle growth and recovery, often claimed to act only where injected — claims without human data.
What people seek and what studies show
Used for muscle growth and repair. In animal models synthetic MGF peptides helped transplanted muscle precursor cells take hold and improved heart function after infarction. Yet two drug companies saw no effect of MGF on human or mouse muscle cells. Pegylation alters its behaviour, so these data may not apply to PEG-MGF. There are no human studies.
Effects
Evidence: Animal data only — effects in people are unproven
Sought effects by goal (as reported)
Possible side effects
Possible does not mean certain: whether they appear depends on dose, duration, individual response and monitoring. Below — what to watch for and how to notice it early.
5 possible side effects
level · how often it is reportedWhat the levels mean
Level: general category from the literature, not your personal risk
How often
- common
- reported often
- possible
- reported in some people
- rare
- reported occasionally
How to lower the risks
For 1 of 5 possible side effects there are specific ways to lower the chance: everyday measures, supplements and options a doctor may consider. For the rest — general advice. No measure removes a risk completely.
Products obtained without a prescription are often fake, mislabeled or non-sterile, and there is no way to check at home. For legal supplements, look for third-party testing (Informed Sport, NSF).
What is unknown cannot be lowered, only avoided; tell your doctor what you have taken.
Never alone, fast sugar always at hand, a glucometer, eat on schedule.
How each option helps (2)
- Glucose monitoring — Readings, fast carbs and company help catch and treat lows — but deaths still occur; there is no safe way to misuse insulin.
- Avoiding alcohol and other liver stressors — Alcohol blocks the liver's glucose release, making insulin lows deeper and longer, including overnight.
No check-up or blood test lowers this risk; avoid with any personal or family history of cancer.
Low-level side effects
Check-ups and blood tests
Which tests and check-ups to do and when. This is a guide — agree the exact schedule with your doctor.
Which doctors can help
At home
- Glucose meter checks only on a plan agreed with a doctor; check at once with shakiness, sweating or confusion, and before driving.
Get medical help at once if
- Shaking, cold sweat, sudden hunger, confusion — fast sugar at once; very drowsy, unable to swallow or unconscious — nothing by mouth, call emergency services, glucagon if prescribed. Night sweats or nightmares can mean lows in sleep.
- A new lump (including in the neck), trouble swallowing or persistent hoarseness, unexplained weight loss, or blood in stool or urine — see a doctor promptly.
In an emergency, call your local emergency number.
Myth & fact
“MGF works only in the muscle where it is injected.”
No human study has tested this. Claims of local-only action with no body-wide effects come from forums, and in two drug companies' lab tests MGF did not make muscle cells multiply more.
Combinations
No specific combination notes for this substance yet. The stack check still adds up side effects that several substances share.
Sources
Possible side effects by body system, combinations, how to lower the risks and which tests to do — free.
Open the stack check