The FDA scheduled a hearing on peptides and the implications could be significant for prescribers and 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. Deep Dive: Regulatory Status of Popular Compounded Peptides Holt Law FDA to weigh easing limits on unproven peptides promoted by RFK Jr.