Iron oxide isn't particularly bad for your health, either. Your steak is already filled with rusted iron. Your body is filled with rusted iron.

Chrome, on the other hand... that shit is nasty.

Actually trivalent chromium is an essential nutrient (trace amounts). Hexavalent chromium is the "bad" chromium. Chromium metal is not considered a health hazard.

Chromium salts (chromates) can cause allergic skin reactions.