Looking into Google Scholar I found this book "Nutritional anemias" by U. Ramakrishnan. At page 3 it is written: "Ancient Greeks recognized the benefits of iron salt to improve muscolar weakness in injured war veterans. The weakened suffurers hoped to assume some of the strenght of this metal by drinkin water in which a sword had rusted".
Unfortunately the note is not visible. Is someone able to give me any reference regarding the medical use of iron rust in ancient Greece?