Injectable Peptides: Out of the Back Alley and Into the Light? Berkley Lifesciences Everyone online is suddenly injecting peptides. But almost nobody understands the scienceor the regulation. The FDA recently shifted several peptides off the Category 2 safety risk list tied to compounding rules. First, that 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 I spent 4 months reporting on the peptide BPC 157 and its unlikely journey from a research lab in post communist Croatia to today's MAHA movement. Ask me anything. : r IAmA What Are Injectable Peptides? Here's Why Doctors Are Worried About the Latest TikTok Wellness Fad. WSJ FDA Peptide Update: Category 2 Removals Explained