FDA Removes 12 Peptides from 503A Category 2 Newtropin peptides #fda #longevity #glp1 #precisionmedicine #compounding Katherine Erickson 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 When will the FDA reclassify BPC 157 to Category 1? Odds & Predictions