>>13584626People sometimes forget that magnets don't just work on outside items but also themselves so if you had a bunch of magnetic material injected into you, it would just clump up on itself and become a clot almost immediately. Barring the likely scenario that includes you dying withing 5 minutes of the injection, the level of magnetic material you would need to generate any significant field would be catastrophic to your body. You would quickly succumb to the toxic metals in your bloodstream and die very quickly from multisystem organ failure.