As of April 17, 2026, no green synthesis method for iron oxide nanoparticles has been developed for treating anemia in animals.

Caveats

• At least one peer-reviewed study (2021, PMC) explicitly reports green-synthesized iron oxide nanoparticles tested as a therapy in an animal anemia model, directly contradicting the claim.
• The claim uses a sweeping universal negative ('no method has been developed'), which is falsified by even a single documented counterexample in the literature.
• Some cited studies are preliminary or propose further investigation rather than established treatments, but they still demonstrate that green synthesis methods for this purpose have been developed and tested in animals.