How does MGF (Mechano Growth Factor) work?
Splice variant of IGF-1 produced locally by muscle in response to mechanical loading. Activates satellite cells (muscle stem cells) to proliferate and fuse, the basis of damage-driven hypertrophy. Native form is metabolized in minutes. In plain terms, MGF (Mechano Growth Factor) is splice variant of IGF-1 produced by muscle in response to mechanical loading and damage. Triggers satellite cell activation. Short half-life, superseded for most use cases by PEG-MGF. Mechanistic detail like this comes largely from preclinical and early research, the human picture is limited.
What people use it for
- Lifters experimenting with site-specific muscle anabolism
- Post-injury muscle recovery contexts
- Researchers preferring short-acting MGF over PEGylated version
References
- Mechano-growth factor (MGF) and muscle regeneration, review — Goldspink G, J Musculoskelet Neuronal Interact, 2005
- Mechano-growth factor peptide, the COOH terminus of unprocessed insulin-like growth factor 1, has no apparent effect on myoblasts or primary muscle stem cells — Fornaro M, Hinken AC, Needle S, et al., American Journal of Physiology - Endocrinology and Metabolism, 2014
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Last updated 2026-06-06.