What it is
TB-500 is a name used in the online peptide market for products described as related to thymosin beta-4, a naturally occurring peptide involved in cell processes. Product names and actual composition can vary.
What the evidence can tell us
Laboratory and animal studies involving thymosin beta-4 or fragments cannot automatically validate a retail vial labelled TB-500. Differences in sequence, formulation, route, purity, and study context matter. Controlled human evidence for common recovery and performance claims is not established.
Canadian context
Health Canada’s April 2026 advisory names TB-500 among unauthorized injectable peptide drugs consumers should not buy or use. No authorized TB-500 drug product was identified in the Drug Product Database on the date checked.
Key unknowns
Product identity, human efficacy, short- and long-term safety, and interactions remain uncertain. Athletes must also consider current anti-doping rules and should verify substances through official sport-integrity resources.
Source trail