THE 60-SECOND GUIDE
TB-500
Laboratory identification · therapeutic benefit unestablished.
Guide prepared November 13, 2026 · profile review dates retained
What is it?
TB-500 is a name used for products associated with thymosin beta-4 research. The exact peptide matters: a short fragment and the full-length molecule are different substances, and neither a familiar name nor a related mechanism proves injury recovery. [1]
Potential benefits
Thymosin beta-4 biology includes actin binding and cell-migration pathways. Those mechanisms motivate research into repair and regeneration. Evidence about native thymosin beta-4 cannot automatically be assigned to every TB-500 product. [1]
Evidence & its limits
The WADA research identifies a fragment, not evidence that every commercial TB-500 product has the same composition. Studies of full-length thymosin beta-4 cannot establish the safety or efficacy of a fragment sold under this name. [1]
Risks & unknowns
Robust therapeutic human evidence for marketed TB-500 is lacking. Exact sequence, purity, sterility, and product identity may be uncertain. WADA prohibits thymosin beta-4 and derivatives including TB-500. [1]
Status & scope
Therapeutic benefit for marketed TB-500 is not established. Full-length thymosin beta-4 and its fragments are different substances; a marketing name does not ensure product identity. [1]
The question to ask
Does the evidence match the exact product, route, condition and outcome being discussed? Check the full record and its review dates. This summary is selective; the product label and clinical assessment contain additional warnings and contraindications.
CHECK THE RECORD
Sources & review
Guide prepared November 13, 2026 · profile review dates retained. Condensed from the linked site evidence record. This format update is not a new clinical review of every source. Consult the full profile for its evidence-review dates and targeted updates.
Selective educational summary, not treatment or dosing advice. Existing profile review dates retained; no independent clinical review.