Is Thymosin Beta-4 prohibited in sport?
Current sport-status snapshot for Thymosin Beta-4: Prohibited at all times under the 2026 WADA List (S2), which names thymosin beta-4 and derivatives such as TB-500.
DIRECT ANSWER
Thymosin Beta-4 sport status.
Current sport-status snapshot for Thymosin Beta-4: Prohibited at all times under the 2026 WADA List (S2), which names thymosin beta-4 and derivatives such as TB-500.
Reviewed August 8, 2026. Each statement links to its evidence record, followed by the primary and official sources used for this answer.
Prohibited at all times under the 2026 WADA List (S2), which names thymosin beta-4 and derivatives such as TB-500.
Open evidence recordNo FDA-approved thymosin beta-4 drug product identified in the August 2026 source snapshot.
Open evidence recordAnti-doping rules and product ingredients can change. Athletes should verify the current official list and their product before making a real decision.
Open evidence recordPRIMARY & OFFICIAL SOURCES
Sources for this answer.
3 source records, with duplicates removed.