Mimrylo (Rusfertide): The FDA Just Approved a Peptide That Mimics a Hormone Most People Have Never Heard Of
On 28 August 2026 FDA approved Mimrylo (rusfertide) for polycythemia vera — the first hepcidin-mimetic peptide medicine. The mechanism is iron restriction, and it is a case study in engineering an unusable hormone into a drug.
