MGF
Limited researchMechano Growth Factor | IGF-1 Splice Variant
Non-pegylated IGF-1 splice variant produced locally in muscle tissue following mechanical stress.
Molecular & research data
- Sequence
- YQPPSTNKNTKSQRRKGSTFEEHK
- Molecular weight
- ~2,888 Da
- Half-life
- ~5-7 minutes
- Primary targets
- igf1
- Routes (research)
- Injectable
- Storage
- Refrigerate at 2-8°C; use within 30 days
Overview
Non-pegylated IGF-1 splice variant produced locally in muscle tissue following mechanical stress. Has a very short half-life compared to PEG-MGF, requiring more frequent administration or localized injection.
Mechanism of action
Activates muscle satellite stem cells via receptor binding, stimulating MAPK/ERK signaling. Enhances protein synthesis and promotes muscle fiber repair. The E-peptide domain exhibits distinct activity from mature IGF-1.
Key research findings
- Satellite cell activation for muscle repair
- Recovery support following mechanical stress
- Localized tissue regeneration
- Natural upregulation after exercise
Research applications
Muscle Repair
- Satellite Cell Activation — Primary mechanism activating dormant muscle satellite cells which fuse to damaged fibers.
- Local Muscle Recovery — Short half-life means effects are concentrated at injection site.
- Post-Exercise Recovery — Naturally upregulated after mechanical stress; supplementation enhances repair processes.
Tissue Regeneration
- Tendon Healing — Animal studies suggest improved tendon injury outcomes when applied locally.
- Bone Regeneration — Research indicates potential for bone healing via osteoblast regulation.
MGF FAQ
Why is MGF injected directly into muscles post-workout?+
MGF has a 5-7 minute half-life and activates satellite stem cells locally at the injection site. Post-workout timing is critical because muscles are primed for growth and recovery. Direct intramuscular injection confines effects to the trained muscle group you want to develop.
How is MGF different from PEG-MGF?+
Standard MGF has a 5-7 minute half-life requiring daily injections. PEG-MGF (pegylated) lasts much longer (hours). Choose based on protocol preference: frequent localized doses (MGF) or fewer higher-dose injections (PEG-MGF). Effects are similar; administration differs.
Can MGF cause hypoglycemia?+
Possibly, though less likely than IGF-1 LR3 due to MGF's very short half-life and localized action. However, the post-workout window and direct muscle injection make hypoglycemia unlikely. Still monitor early use and consume carbs post-injection as a precaution.
How long do I need to use MGF to see muscle growth?+
Week 1-2 shows reduced soreness in targeted muscles. Week 4-8 shows noticeable improvements in trained muscle size and recovery capacity. Most users run 8-12 week cycles with equal off-time. Structural gains from satellite cell activation may persist after discontinuation.
References
Related peptides
PEG-MGF
Limited researchPegylated Mechano Growth Factor | IGF-1 Splice Variant
Modified IGF-1 variant with PEG attachment extending half-life from minutes to hours. Activates muscle satellite cells following mechanical stress or injury.
IGF-1 LR3
Limited researchModified Growth Factor Analog | Muscle Growth
IGF-1 LR3 is a synthetic 83-amino acid analog of insulin-like growth factor-1 that has never been approved for human use.
BPC-157
PreclinicalPentadecapeptide studied for tissue repair
BPC-157 is a synthetic 15-amino-acid peptide derived from a protein found in gastric juice, studied extensively in animal models for accelerated healing of tendon, ligament, muscle, and gut tissue.
TB-500
PreclinicalSynthetic Thymosin Beta-4 studied for repair & cell migration
TB-500 is a synthetic version of Thymosin Beta-4 (or its active fragment), a naturally occurring peptide studied for its role in actin regulation, cell migration, and tissue repair.
Last reviewed: 2026-06-26. Information is provided for research and educational reference only — see our disclaimer.