fda warning letters bpc 157 2023 2025 On August 15 2025, the U.S. Food & Drug Administration (FDA) issued a Letter to Platinum Biologics LLC for marketing umbilical‑cord‑derived products including exosome products (“NanoEx” & “Nano Xsomes”) without approval DOSAGE:10mg thymosin beta fragment bpc 157 ankle BPC-157
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