FDA Warning Letter Breakdown: Testing the Line Between Consumer Wellness Claims and Regulated Physiologic Measurement Functions in Wearables Multifunctionality and Possible Medical Application of the BPC 157 PeptideLiterature and Patent Review FDA Form 1572: What It Means & Who It Includes 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