What are peptides? FDA may ease restrictions on unproven health fad LiveNOW from FOX There's No Evidence" Why Your Doctor Can't Recommend Peptides Like BPC 157 Proactive Health Labs Think twice before injecting peptides bought online: unauthorized products can seriously harm you Canada.ca 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.