fda warning letters bpc-157 2023 2024 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 mg:20mg research tissue repair peptide BPC 157 Injection at
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