The Blacklisting of Peptides FDA Unbans 14 Peptides for Legal US Compounding! : r Biohackers FDA Puts BPC 157, TB 500, and 5 Other Peptides Under the Microscope: What Prescribers Need to Know About the 503A Review Lengea Major peptide regulatory news this week. The FDA announced on April 15 that it will remove 12 peptides from Category 2 of the 503A bulk drug substances list after seven calendar days. FDA Is Expected to Lift Restriction on Peptides, Heeding RFK Jr.'s Wishes The New York Times