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International Journal of Peptide Research, 42(2), 178-195

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Park, J., Lee, H., Kim, S., & Yang, S

TB-500 and Thymosin Beta-4 are also prohibited by WADA/USADA under S2 (Peptide Hormones, Growth Factors, Related Substances and Mimetics), applicable at all times both in-competition and out-of-competition TB-500 / Thymosin Beta-4 Clinical Trials: The RGN-352 and RGN-259 Programs RegeneRx Biopharmaceuticals has pursued two clinical development programs for Thymosin Beta-4, providing the most substantial human clinical data available for any TB-500-related compound: RGN-352 (Injectable Thymosin Beta-4 for Cardiac Repair): Phase 1 trial (completed): A double-blind, placebo-controlled study enrolled 40 healthy volunteers across four cohorts of 10 subjects each, testing escalating dose levels of intravenous Thymosin Beta-4 administered daily over 14 days