Four things to know · April 15, 2026
TB-500
Thymosin Beta-4 Fragment
TB-500 is a synthetic version of the active region of thymosin beta-4, a repair protein your body produces naturally.
Noticed in days · Full benefit in weeks
Week 1-2
Typically reduced inflammation and improved tissue sensation
Week 2-4
Healing rate and tissue quality typically accelerate
Week 4-8
Full tissue repair and regenerative benefits are commonly reached
Week 6-12
Continued improvement in tissue strength and function typically observed
TB-500 is a synthetic version of the active region of thymosin beta-4, a repair protein your body produces naturally. It was originally studied in racehorses (where it became famous for tendon recovery), and has since moved into human research for whole-body tissue repair. The fragment is more stable than the full protein, which makes it practical for consistent dosing. Prohibited by WADA (the World Anti-Doping Agency, which governs drug testing in competitive sports).
How it works
TB-500 spreads through the body and works systemically, unlike BPC-157, which concentrates near the injection site. It tells repair cells where to go by regulating cell migration, builds new blood vessels to bring nutrients to damaged areas, calms inflammation, and activates stem cells to speed up the rebuilding process. That systemic reach is why people often explore it alongside BPC-157: one works everywhere, the other works locally.
Key benefits
What it’s been studied for:
- ✓Works systemically, reaching muscles, tendons, ligaments, and organs throughout the body
- ✓Directs repair cells to where they are needed most
- ✓Builds new blood vessels to support healing
- ✓Activates stem cell differentiation for faster recovery
- ✓Reduces inflammation broadly, not just at one site
Related goals
Regulatory status
Category 2. The FDA's pharmacy compounding advisory committee is scheduled to review TB-500 on July 23, 2026, for potential addition to the 503A bulks list. The use under review: wound healing. Prohibited by WADA under S2.3 since 2011, with a 4-year ban for athletes testing positive.
Journal · July 2026 PCAC
What the peptide panel is really voting on →
Protocols
| Protocol | Dose | Frequency |
|---|---|---|
| General tissue repair | 2-3mg | 2x weekly |
| Serious injury recovery | 4-5mg | 3x weekly |
| Athletic enhancement | 2-3mg | 2x weekly |
| Chronic conditions | 3-4mg | 2-3x weekly |
| Maintenance | 2mg | 1-2x weekly |
| Post-surgical recovery | 3-5mg | 3x weekly |
Protocols are from published research literature. This is not medical advice. Dosing should be determined by a licensed clinician.
What people report
Typically reduced inflammation and improved tissue sensation
Healing rate and tissue quality typically accelerate
Full tissue repair and regenerative benefits are commonly reached
Continued improvement in tissue strength and function typically observed
What to know
- ⚠Prohibited by WADA (World Anti-Doping Agency). Not cleared for competitive sports
- ⚠Avoid during active cancer treatment. TB-500's growth-promoting effects could support tumor progression
- ⚠Mild injection site reactions are common and resolve on their own
- ⚠If you take immunosuppressive medications, talk to your clinician first
- ⚠Avoid during pregnancy or breastfeeding
KEY RESEARCH · 4 PAPERS CITED
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