Review · United States
TB-500
Reviewed on
Approval and product status
No FDA-approved TB-500 drug product
TB-500 is not the same as the full thymosin beta-4 molecule. FDA identifies TB-500 as a seven-amino-acid fragment, not as interchangeable with full-length thymosin beta-4. Internet naming and certificates do not establish product identity or clinical equivalence.
What was measured in people?
- Health results · Unclear
- FDA found no adequate human clinical outcome evidence for compounded TB-500 wound-healing use.
- Body changes · Limited
- Fragment identity and laboratory findings do not establish a clinical benefit in people.
A change in a hormone or body signal does not by itself prove a health benefit.
Important limits
This tool is not an independent medical review. It does not recommend treatment.
This is not an invitation to experiment. The guide provides no sourcing, reconstitution, injection, cycle, stack, or injury-treatment instructions.
Still unknown: Reliable controlled studies in people do not establish faster tendon, muscle, or wound healing from TB-500. Safety, purity, sterility, long-term effects, and equivalence of marketed material remain uncertain.
This record cannot check a package, seller, batch, or personal treatment. It does not provide sport clearance.
Products in this review
These are selected records, not every product or form.
No product label record is included here. That is not a separate approval decision. Read the status and sources above.
What the research shows
FDA has published a detailed 2026 briefing on TB-500's identity, characterization, proposed wound-healing use, and evidence gaps. WADA explicitly names TB-500 on the 2026 Prohibited List.
Read all TB-500 fact checksSources used in this review
A source may support some statements, not all of them. Use the links above or this review to see what each source supports.
Show 3 sources
- FDA briefing document for TB-500-related bulk drug substances
U.S. Food and Drug Administration · FDA review · 2026
Source accessed
- TB-500 substance record
U.S. Food and Drug Administration Global Substance Registration System · Reference · 2026
Source accessed
- 2026 Prohibited List
World Anti-Doping Agency · Anti-doping · 2026
Source accessed