FDA Puts BPC 157, TB 500, and 5 Other Peptides Under the Microscope: What Prescribers Need to Know About the 503A Review Lengea FDA puts some peptides off limits PEPTIDES: THE 2026 FDA CRACKDOWN CONTROVERSYWhy this is MASSIVE SEO RIGHT NOW BPC 157 banned 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.