PEG-MGF vs TB-500
A detailed comparison to help you understand the differences and choose the right peptide for your research goals.
PEG-MGF
PEG-MGF (PEGylated Mechano Growth Factor) is a variant of IGF-1 that is produced in response to muscle damage. PEGylation extends its half-life from minutes to several hours, making it practical for use.
Full details →TB-500
Thymosin Beta-4 (TB-500) is a naturally occurring peptide present in almost all human and animal cells. It plays a crucial role in tissue repair and regeneration.
Full details →Side-by-Side Comparison
| Aspect | PEG-MGF | TB-500 |
|---|---|---|
| Dose Range | 400 mcg–1.2 mg | 2 mg–2.5 mg |
| Frequency | Less than daily | Less than daily |
| Cycle Length | 4–6 weeks | 4–8 weeks |
| Route | subcutaneous | subcutaneous |
| Mechanism | Activates muscle satellite cells (stem cells) and promotes their fusion to existing muscle fibers for repair and growth. MGF is produced naturally in response to mechanical stress on muscles. | TB-500 promotes cell migration and differentiation, regulates actin (a cell-building protein), and reduces inflammation. It supports the formation of new blood vessels and wound healing. |
| Typical Dosage | Research protocols typically use 200-400mcg injected into targeted muscle groups 2-3 times weekly, usually post-workout. | Research protocols typically use 2-2.5mg twice weekly during the loading phase, followed by maintenance dosing of 2mg every 2 weeks. |
| Administration | Intramuscular injection, ideally into muscles trained that day. Best administered post-workout when satellite cell activation is relevant. | Administered via subcutaneous or intramuscular injection. Some protocols suggest injection near injury sites. |
| Side Effects | Injection site soreness, potential hypoglycemia, and localized swelling. Generally well-tolerated. | May cause temporary fatigue, headache, or localized irritation at injection sites. |
| Best For |
What They Have in Common
PEG-MGF, TB-500 are both commonly used for:
Which Has Stronger Evidence?
- Recovery & Healing: TB-500 has stronger research support.
| Goal | PEG-MGF | TB-500 |
|---|---|---|
| Muscle Growth | medium | medium |
| Recovery & Healing | medium | high |
Key Studies
TB-500
- Effects of BPC-157 and TB-500 on Achilles tendon healing in rats: A histopathological and biomechanical study.
Joint diseases and related surgery, 2026
- Simultaneous quantification of TB-500 and its metabolites in in-vitro experiments and rats by UHPLC-Q-Exactive orbitrap MS/MS and their screening by wound healing activities in-vitro.
Journal of chromatography. B, Analytical technologies in the biomedical and life sciences, 2024
- Adsorption effects of the doping relevant peptides Insulin Lispro, Synachten, TB-500 and GHRP 5.
Analytical biochemistry, 2017
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