FDA mulls compounding for peptides previously flagged over safety risks BioSpace The Blacklisting of Peptides The FDA's Ban of Therapeutic Peptides: A Threat to Health Freedom Slim 'n Sleek 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 REPORTEDLY EXPECTED TO LIFT RESTRICTION ON PEPTIDES NYT Important Update on FDA Changes Concerning Peptides