Supplement Scholar
Anabolic / Growth Factor

MGF

Research compound. This is not a dietary supplement. Unless it is identified as an approved prescription drug, it is not approved by the FDA for human use. This page summarizes published research for education only; we do not sell it or link to sellers.

MGF. Splice variant of IGF-1 produced after mechanical load that activates muscle stem cells.

How it works. Acts on satellite cells via a distinct pathway from systemic IGF-1, recruiting them to fuse with damaged fibers and support hypertrophy.

What the research supports. 2 graded claims. Strongest: Tied tightly to load-induced repair mechanism (preclinical).

Hormonal impact. Effects on Local IGF-1Ec signaling, Systemic IGF-1.

Side effects and interactions. 0 medication interactions listed. Serious: Tumor-growth concerns shared with IGF-family peptides.

Stacking. Pairs well with Eccentric or heavy training. Avoid combining with Active malignancy.

Common forms. Available as Intramuscular injection (research).

Community. Experiences from people who have tried MGF. Anecdotes are not medical advice.

MGF. Splice variant of IGF-1 produced after mechanical load that activates muscle stem cells.

No single structure

What it is

MGF is the IGF-1Ec splice variant produced locally in muscle after mechanical or eccentric loading. Synthetic MGF mimics the short, immediate-acting form.

Also called

Mechano Growth FactorIGF-1Ec

How it works

Acts on satellite cells via a distinct pathway from systemic IGF-1, recruiting them to fuse with damaged fibers and support hypertrophy.

Pathways

  • Satellite-cell activation
  • Local IGF-1R signaling

Effects

  • ↑Satellite-cell activation increases
  • +Localized fiber repair supports

What the research supports

Tied tightly to load-induced repair mechanismpreclinical
Local action limits systemic exposurepreclinical

Strong: consistent results across large trials or meta-analyses. Moderate: several trials, mostly positive. Limited: small or mixed studies. Preclinical: animal or cell research only.

Hormonal impact

↑Local IGF-1Ec signalingincreases
=Systemic IGF-1stabilizes

Side effects & interactions

Common side effects

  • Injection-site soreness

Serious

  • Tumor-growth concerns shared with IGF-family peptides

No notable medication interactions listed.

Check any supplement–medication combination with your pharmacist before starting.

Combines with

Pairs well

  • Eccentric or heavy trainingMatches the physiological context MGF evolved for.

Avoid combining

  • Active malignancyShared IGF-family risk.

Common forms

  • Intramuscular injection (research)

Discussion

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