Legislative nomenclature for S2, S3, S4 and S8 medicines Download Table Application for a wholesale licence Poisons New changes are coming to the injectable peptide market. That includes the FDA's proposed deregulation, announced by U.S. health secretary Robert F. Kennedy, Jr., which is likely to impact the supplement and Introduction to the Poisons Standard 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.