Thymosin Beta-4: What the Evidence Shows
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Anonymous user report. Not medical advice. Peptides discussed are not FDA-approved for the uses described. Editorial process →
What is thymosin beta-4?
Thymosin beta-4 (Tβ4) is a natural 43-amino-acid protein found in most cells, where it binds actin and helps cells migrate during tissue repair. TB-500 is a synthetic fragment marketed on the idea that it carries the same repair activity; it is not identical to the full protein.
What the research says
Most evidence for wound, heart and tendon repair comes from animal studies. In people, Tβ4 eye drops (RGN-259) have been tested in clinical trials for dry eye and neurotrophic keratitis, with mixed results on primary endpoints; no thymosin beta-4 product is FDA approved. There are no human trials of injected Tβ4 or TB-500 for injuries. WADA bans thymosin beta-4 and its fragments in sport. Last reviewed: October 2026.
Anonymous thymosin beta-4 reports
No reports found.
If you have used thymosin beta-4, submit what happened.
Submit yoursCommunity Q&A
- Is thymosin beta-4 the same as TB-500?
- No. TB-500 is a synthetic fragment marketed as a version of thymosin beta-4; the full natural protein is 43 amino acids.
- Is thymosin beta-4 FDA approved?
- No. Eye-drop versions have been tested in trials, but no product is approved.
- Is thymosin beta-4 banned in sport?
- Yes. WADA prohibits thymosin beta-4 and its derivatives.
Anonymous first-hand reports plus sourced context — educational only, not medical advice. Editorial policy & corrections.