A closer look
Human bodies contain enough iron to forge a single, small metal nail roughly three inches in length, primarily concentrated within the hemoglobin of our red blood cells; this vital metallic element binds with oxygen in the lungs and carries it to tissues throughout the entire body, quite literally rusting and un-rusting as it circulates, which sounds incredibly hardcore until you realize a mild iron deficiency makes you dizzy just from standing up too quickly—you have actual forgeable metal coursing through your veins right now, but instead of using it to become an unstoppable cyborg warrior, you get exhausted from carrying three light bags of groceries up a single flight of stairs, proving evolution really gave us heavy metal blood just to let us become tired, cynical couch potatoes who need a nap after doing the bare minimum amount of household chores
