FDA Peptide Update: Category 2 Removals Explained Last week @fda sends out clarification on who can and cannot compound #glp1 like #tirzeaptide and #semaglutide and this week ProRx 503b shuts down GLP 1 compounding while @martymakary is photographed holding bootleg # FDA Peptide Reclassification 2026: What Researchers Want FDA has removed certain bulk drug substances that were placed on the category two list and has announced it will consult the Pharmacy Compounding Advisory Committee (PCAC) for potential future inclusion of FDA Proposes to Exclude GLP 1s From 503B Bulk List Drug Topics Updates on 503A Compounding: Legal and Regulatory Developments Pharmacy Times