Is MGF the same as IGF-1?

It is a splice variant with distinct effects in animal models

Does MGF repair muscle after workouts?

Animal data suggest a role in satellite-cell activation

growth

MGF

MGF is a splice variant of IGF-1 that is expressed in response to mechanical stress and muscle damage. It is studied for muscle repair but has no approved therapeutic use and no human clinical trials supporting injection.

Ian Gauntt, RN BSN1 min readPreclinical

Aliases: Mechano Growth Factor, IGF-1Ec

Educational content only — this is not medical advice. Nothing here is a recommendation to buy, obtain, or use MGF. Talk to a licensed clinician before making health decisions.

What it is

Mechano Growth Factor (MGF) refers to a splice variant of the IGF-1 gene (IGF-1Ec in humans) that is upregulated after exercise or tissue injury. It is thought to activate satellite cells and promote muscle repair. Synthetic MGF peptides sold online are not the same as endogenous MGF and are unregulated.

What the evidence shows

Preclinical studies show that MGF promotes muscle-cell proliferation and may aid recovery from injury in animal models. Human evidence is limited to basic research on IGF-1 splicing; no RCT has tested injectable synthetic MGF for muscle growth or recovery in people.

Risks & unknowns

Like other IGF-1-related peptides, MGF may stimulate cell proliferation and carries theoretical cancer risk. Human pharmacology and toxicity are unknown. Unregulated products are a major concern.

Legal / regulatory status

MGF is not FDA-approved and is prohibited by WADA under S2.

FAQ

Is MGF the same as IGF-1?: It is a splice variant with distinct effects in animal models
Does MGF repair muscle after workouts?: Animal data suggest a role in satellite-cell activation
Is MGF banned?: Yes

References

Mechano growth factor and muscle repair (J Physiolpreclinical
IGF-1 splice variants in skeletal muscle (Exp Physiolreview
WADA Prohibited Listregulatory