The reason peptide access is changing comes down to two regulatory categories most patients don't know exist: 503A and 503B. 503A = traditional compounding pharmacies. State licensed, patient specific prescriptions. 503B = FDA registered outsourcing Are Peptides coming off of the FDA Category 2 list? A legal breakdown Holt Law FDA Peptide Reclassification 2026: What Researchers Want The peptide conversation is shifting. Secretary RFK Jr. recently announced that the FDA plans to move 14 peptides from Category 2 back to Category 1 restoring FDA recognized status and making them FDA Set to Review Peptide Access for Compounding Pharmacies Drug Topics