Category 1 vs. Category 2. The FDA's peptide update, explained. Category 2 peptides are on the FDA's difficult to compound list, which effectively blocks licensed pharmacies from producing them. Category 1 means FDA's new guidelines on bulk drug compounding Pharmacy & Healthcare Legal Blog Compounded Drug Products That Are Essentially Copies of Approved Drug Products Under Section 503B of the Federal Food, Drug, and FDA mulls compounding for peptides previously flagged over safety risks BioSpace The Blacklisting of Peptides The Pharmacology of Longevity: Peptide Edition (Part 1)