RFK Jr.'s peptide push could unleash risky drugs STAT First Opinion BPC 157 TB500 erectile dysfunction effects FDA to weigh easing limits on unproven peptides favored by RFK Jr. and other MAHA figures The Washington Post 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.