Sources: U.S. Food and Drug Administration (FDA) Compounding and the FDA (503A & 503B guidance) FDA warning letters on unapproved peptide products National Institutes of Health (NIH) PubMed FDA Is Expected to Lift Restriction on Peptides, Heeding RFK Jr.'s Wishes The New York Times An FDA Reversal on Peptides Could Open the Market to Unsafe Drugs ProPublica FDA Compliance for Peptide Therapy and BPC 157 Holt Law What Are Injectable Peptides? Here's Why Doctors Are Worried About the Latest TikTok Wellness Fad. WSJ