What? Unless you have haemochromatosis this is really tinfoilery over the iron levels acquired through natural ingestion, especially the thought of leach levels from a pan. You get more iron from meat or a bowl of cereal than you could ever get from a pan without it being flat out dissolved in the process over the course of a handful of cooks.
Is the iron that leaches from pan even bio-available? Aren't supplements very specific compounds? I can admit that it might be toxic, but that toxicity is not due to something like over production of haemoglobin...
A pan is about 1 kg (a good cast iron one could be much heavier). That's enough for 200,000 bowls of cereal.
Even if you reckon the pan is degraded enough to be obviously useless after losing 5% of its weight, that would require you to use it every day for 30 years, not "a handful of cooks".
