Empower 503B Outsourcing Facility Serving Retail Pharmacies Why the FDA Is Paying More Attention to 503A & 503B Pharmacies If you've been watching the compounding space, especially around GLP 1s and peptides, you've probably noticed something. The FDA is paying What Peptides Are Legal in the U.S.? Understanding FDA Approval, Compounding, and the Legal Gray Areas 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 # 503A vs. 503B Epicur Pharma 503A Vs. 503B Compounding Pharmacies: Similarities & Differences