Some peptides are FDA approved drugs. Some are legal supplements. Some are neither. The same word, peptide, covers all three categories. The regulatory status of the specific compound is what determines legality. FDA issued its first warning letter to a dispenser (a medical spa) for violating the Drug Supply Chain Security Act (DSCSA), including failing to source products from authorized trading partners and FDA moves toward easing restrictions on certain peptides BioPharma Dive FDA to weigh easing limits on unproven peptides promoted by RFK Jr.